diff --git a/data/app.driftwood.Driftwood.gschema.xml b/data/app.driftwood.Driftwood.gschema.xml
index 379a2b4..b5a1908 100644
--- a/data/app.driftwood.Driftwood.gschema.xml
+++ b/data/app.driftwood.Driftwood.gschema.xml
@@ -124,6 +124,11 @@
       <summary>Security notification threshold</summary>
       <description>Minimum CVE severity for desktop notifications: critical, high, medium, or low.</description>
     </key>
+    <key name="catalog-last-refreshed" type="s">
+      <default>''</default>
+      <summary>Catalog last refreshed</summary>
+      <description>ISO timestamp of the last catalog refresh.</description>
+    </key>
     <key name="watch-removable-media" type="b">
       <default>false</default>
       <summary>Watch removable media</summary>
diff --git a/src/core/database.rs b/src/core/database.rs
index 79f7ce3..a24591b 100644
--- a/src/core/database.rs
+++ b/src/core/database.rs
@@ -88,6 +88,42 @@ pub struct SystemModification {
     pub previous_value: Option<String>,
 }
 
+#[derive(Debug, Clone)]
+pub struct CatalogApp {
+    pub id: i64,
+    pub name: String,
+    pub description: Option<String>,
+    pub categories: Option<String>,
+    pub download_url: String,
+    pub icon_url: Option<String>,
+    pub homepage: Option<String>,
+    pub license: Option<String>,
+}
+
+#[derive(Debug, Clone)]
+pub struct CatalogSourceRecord {
+    pub id: i64,
+    pub name: String,
+    pub url: String,
+    pub source_type: String,
+    pub enabled: bool,
+    pub last_synced: Option<String>,
+    pub app_count: i32,
+}
+
+#[derive(Debug, Clone)]
+pub struct CatalogAppRecord {
+    pub name: String,
+    pub description: Option<String>,
+    pub categories: Option<String>,
+    pub latest_version: Option<String>,
+    pub download_url: String,
+    pub icon_url: Option<String>,
+    pub homepage: Option<String>,
+    pub file_size: Option<i64>,
+    pub architecture: Option<String>,
+}
+
 #[derive(Debug, Clone)]
 pub struct OrphanedEntry {
     pub id: i64,
@@ -641,6 +677,8 @@ impl Database {
 
             CREATE INDEX IF NOT EXISTS idx_catalog_apps_source
                 ON catalog_apps(source_id);
+            CREATE UNIQUE INDEX IF NOT EXISTS idx_catalog_apps_source_name
+                ON catalog_apps(source_id, name);
             CREATE INDEX IF NOT EXISTS idx_sandbox_profiles_app
                 ON sandbox_profiles(app_name);
             CREATE INDEX IF NOT EXISTS idx_runtime_updates_appimage
@@ -1954,6 +1992,236 @@ impl Database {
         self.conn.execute("DELETE FROM system_modifications WHERE id = ?1", params![id])?;
         Ok(())
     }
+
+    // --- Catalog methods ---
+
+    pub fn upsert_catalog_source(
+        &self,
+        name: &str,
+        url: &str,
+        source_type: &str,
+    ) -> SqlResult<i64> {
+        self.conn.execute(
+            "INSERT INTO catalog_sources (name, url, source_type, last_synced)
+             VALUES (?1, ?2, ?3, datetime('now'))
+             ON CONFLICT(url) DO UPDATE SET last_synced = datetime('now')",
+            params![name, url, source_type],
+        )?;
+        self.conn.query_row(
+            "SELECT id FROM catalog_sources WHERE url = ?1",
+            params![url],
+            |row| row.get(0),
+        )
+    }
+
+    pub fn upsert_catalog_app(
+        &self,
+        source_id: i64,
+        name: &str,
+        description: Option<&str>,
+        categories: Option<&str>,
+        download_url: &str,
+        icon_url: Option<&str>,
+        homepage: Option<&str>,
+        license: Option<&str>,
+    ) -> SqlResult<i64> {
+        self.conn.execute(
+            "INSERT INTO catalog_apps (source_id, name, description, categories, download_url, icon_url, homepage, cached_at)
+             VALUES (?1, ?2, ?3, ?4, ?5, ?6, ?7, datetime('now'))
+             ON CONFLICT(source_id, name) DO UPDATE SET
+                description = COALESCE(?3, description),
+                categories = COALESCE(?4, categories),
+                download_url = ?5,
+                icon_url = COALESCE(?6, icon_url),
+                homepage = COALESCE(?7, homepage),
+                cached_at = datetime('now')",
+            params![source_id, name, description, categories, download_url, icon_url, homepage],
+        )?;
+        // Store license as architecture field (reusing available column)
+        // until a proper column is added
+        if let Some(lic) = license {
+            self.conn.execute(
+                "UPDATE catalog_apps SET architecture = ?1 WHERE source_id = ?2 AND name = ?3",
+                params![lic, source_id, name],
+            )?;
+        }
+        self.conn.query_row(
+            "SELECT id FROM catalog_apps WHERE source_id = ?1 AND name = ?2",
+            params![source_id, name],
+            |row| row.get(0),
+        )
+    }
+
+    pub fn search_catalog(
+        &self,
+        query: &str,
+        category: Option<&str>,
+        limit: i32,
+    ) -> SqlResult<Vec<CatalogApp>> {
+        let mut sql = String::from(
+            "SELECT id, name, description, categories, download_url, icon_url, homepage, architecture
+             FROM catalog_apps WHERE 1=1"
+        );
+        let mut params_list: Vec<Box<dyn rusqlite::types::ToSql>> = Vec::new();
+
+        if !query.is_empty() {
+            sql.push_str(" AND (name LIKE ?1 OR description LIKE ?1)");
+            params_list.push(Box::new(format!("%{}%", query)));
+        }
+
+        if let Some(cat) = category {
+            let idx = params_list.len() + 1;
+            sql.push_str(&format!(" AND categories LIKE ?{}", idx));
+            params_list.push(Box::new(format!("%{}%", cat)));
+        }
+
+        sql.push_str(&format!(" ORDER BY name LIMIT {}", limit));
+
+        let params_refs: Vec<&dyn rusqlite::types::ToSql> =
+            params_list.iter().map(|p| p.as_ref()).collect();
+
+        let mut stmt = self.conn.prepare(&sql)?;
+        let rows = stmt.query_map(params_refs.as_slice(), |row| {
+            Ok(CatalogApp {
+                id: row.get(0)?,
+                name: row.get(1)?,
+                description: row.get(2)?,
+                categories: row.get(3)?,
+                download_url: row.get(4)?,
+                icon_url: row.get(5)?,
+                homepage: row.get(6)?,
+                license: row.get(7)?,
+            })
+        })?;
+
+        let mut results = Vec::new();
+        for row in rows {
+            results.push(row?);
+        }
+        Ok(results)
+    }
+
+    pub fn get_catalog_app(&self, id: i64) -> SqlResult<Option<CatalogApp>> {
+        let result = self.conn.query_row(
+            "SELECT id, name, description, categories, download_url, icon_url, homepage, architecture
+             FROM catalog_apps WHERE id = ?1",
+            params![id],
+            |row| {
+                Ok(CatalogApp {
+                    id: row.get(0)?,
+                    name: row.get(1)?,
+                    description: row.get(2)?,
+                    categories: row.get(3)?,
+                    download_url: row.get(4)?,
+                    icon_url: row.get(5)?,
+                    homepage: row.get(6)?,
+                    license: row.get(7)?,
+                })
+            },
+        );
+        match result {
+            Ok(app) => Ok(Some(app)),
+            Err(rusqlite::Error::QueryReturnedNoRows) => Ok(None),
+            Err(e) => Err(e),
+        }
+    }
+
+    pub fn get_catalog_categories(&self) -> SqlResult<Vec<(String, u32)>> {
+        let mut stmt = self.conn.prepare(
+            "SELECT categories FROM catalog_apps WHERE categories IS NOT NULL AND categories != ''"
+        )?;
+        let rows = stmt.query_map([], |row| row.get::<_, String>(0))?;
+
+        let mut counts = std::collections::HashMap::new();
+        for row in rows {
+            if let Ok(cats_str) = row {
+                for cat in cats_str.split(';').filter(|s| !s.is_empty()) {
+                    *counts.entry(cat.to_string()).or_insert(0u32) += 1;
+                }
+            }
+        }
+
+        let mut result: Vec<(String, u32)> = counts.into_iter().collect();
+        result.sort_by(|a, b| b.1.cmp(&a.1));
+        Ok(result)
+    }
+
+    pub fn catalog_app_count(&self) -> SqlResult<i64> {
+        self.conn.query_row("SELECT COUNT(*) FROM catalog_apps", [], |row| row.get(0))
+    }
+
+    pub fn insert_catalog_app(
+        &self,
+        source_id: i64,
+        name: &str,
+        description: Option<&str>,
+        categories: Option<&str>,
+        latest_version: Option<&str>,
+        download_url: &str,
+        icon_url: Option<&str>,
+        homepage: Option<&str>,
+        file_size: Option<i64>,
+        architecture: Option<&str>,
+    ) -> SqlResult<()> {
+        self.conn.execute(
+            "INSERT OR REPLACE INTO catalog_apps
+             (source_id, name, description, categories, latest_version, download_url, icon_url, homepage, file_size, architecture, cached_at)
+             VALUES (?1, ?2, ?3, ?4, ?5, ?6, ?7, ?8, ?9, ?10, datetime('now'))",
+            params![source_id, name, description, categories, latest_version, download_url, icon_url, homepage, file_size, architecture],
+        )?;
+        Ok(())
+    }
+
+    pub fn search_catalog_apps(&self, query: &str) -> SqlResult<Vec<CatalogAppRecord>> {
+        let pattern = format!("%{}%", query);
+        let mut stmt = self.conn.prepare(
+            "SELECT name, description, categories, latest_version, download_url, icon_url, homepage, file_size, architecture
+             FROM catalog_apps
+             WHERE name LIKE ?1 OR description LIKE ?1
+             ORDER BY name
+             LIMIT 50"
+        )?;
+        let rows = stmt.query_map(params![pattern], |row| {
+            Ok(CatalogAppRecord {
+                name: row.get(0)?,
+                description: row.get(1)?,
+                categories: row.get(2)?,
+                latest_version: row.get(3)?,
+                download_url: row.get(4)?,
+                icon_url: row.get(5)?,
+                homepage: row.get(6)?,
+                file_size: row.get(7)?,
+                architecture: row.get(8)?,
+            })
+        })?;
+        rows.collect()
+    }
+
+    pub fn update_catalog_source_sync(&self, source_id: i64, app_count: i32) -> SqlResult<()> {
+        self.conn.execute(
+            "UPDATE catalog_sources SET last_synced = datetime('now'), app_count = ?2 WHERE id = ?1",
+            params![source_id, app_count],
+        )?;
+        Ok(())
+    }
+
+    pub fn get_catalog_sources(&self) -> SqlResult<Vec<CatalogSourceRecord>> {
+        let mut stmt = self.conn.prepare(
+            "SELECT id, name, url, source_type, enabled, last_synced, app_count FROM catalog_sources ORDER BY name"
+        )?;
+        let rows = stmt.query_map([], |row| {
+            Ok(CatalogSourceRecord {
+                id: row.get(0)?,
+                name: row.get(1)?,
+                url: row.get(2)?,
+                source_type: row.get(3)?,
+                enabled: row.get::<_, i32>(4).unwrap_or(1) != 0,
+                last_synced: row.get(5)?,
+                app_count: row.get(6)?,
+            })
+        })?;
+        rows.collect()
+    }
 }
 
 #[cfg(test)]
diff --git a/src/core/mod.rs b/src/core/mod.rs
index 56e97b3..2f35e98 100644
--- a/src/core/mod.rs
+++ b/src/core/mod.rs
@@ -1,6 +1,7 @@
 pub mod analysis;
 pub mod appstream;
 pub mod backup;
+pub mod catalog;
 pub mod database;
 pub mod discovery;
 pub mod duplicates;
diff --git a/src/ui/catalog_view.rs b/src/ui/catalog_view.rs
new file mode 100644
index 0000000..d1529a4
--- /dev/null
+++ b/src/ui/catalog_view.rs
@@ -0,0 +1,442 @@
+use adw::prelude::*;
+use std::cell::RefCell;
+use std::rc::Rc;
+
+use gtk::gio;
+
+use crate::core::catalog;
+use crate::core::database::Database;
+use crate::i18n::i18n;
+use super::widgets;
+
+/// Build the catalog browser page.
+pub fn build_catalog_page(db: &Rc<Database>) -> adw::NavigationPage {
+    let toast_overlay = adw::ToastOverlay::new();
+
+    let header = adw::HeaderBar::new();
+    let title = adw::WindowTitle::builder()
+        .title(&i18n("App Catalog"))
+        .subtitle(&i18n("Browse available AppImages"))
+        .build();
+    header.set_title_widget(Some(&title));
+
+    // Search entry
+    let search_entry = gtk::SearchEntry::builder()
+        .placeholder_text(&i18n("Search apps..."))
+        .hexpand(true)
+        .build();
+
+    let search_bar = gtk::SearchBar::builder()
+        .child(&search_entry)
+        .search_mode_enabled(true)
+        .build();
+
+    // Category filter
+    let category_box = gtk::Box::builder()
+        .orientation(gtk::Orientation::Horizontal)
+        .spacing(8)
+        .margin_start(18)
+        .margin_end(18)
+        .build();
+
+    let category_scroll = gtk::ScrolledWindow::builder()
+        .child(&category_box)
+        .vscrollbar_policy(gtk::PolicyType::Never)
+        .hscrollbar_policy(gtk::PolicyType::Automatic)
+        .max_content_height(40)
+        .build();
+
+    // Results list
+    let results_box = gtk::ListBox::builder()
+        .selection_mode(gtk::SelectionMode::None)
+        .css_classes(["boxed-list"])
+        .margin_start(18)
+        .margin_end(18)
+        .margin_top(12)
+        .margin_bottom(24)
+        .build();
+
+    let clamp = adw::Clamp::builder()
+        .maximum_size(800)
+        .tightening_threshold(600)
+        .build();
+
+    let content = gtk::Box::builder()
+        .orientation(gtk::Orientation::Vertical)
+        .spacing(12)
+        .build();
+
+    content.append(&search_bar);
+    content.append(&category_scroll);
+    content.append(&results_box);
+    clamp.set_child(Some(&content));
+
+    let scrolled = gtk::ScrolledWindow::builder()
+        .child(&clamp)
+        .vexpand(true)
+        .build();
+
+    // Status page for empty state
+    let empty_page = adw::StatusPage::builder()
+        .icon_name("system-software-install-symbolic")
+        .title(&i18n("App Catalog"))
+        .description(&i18n("Refresh the catalog to browse available AppImages"))
+        .build();
+
+    let refresh_btn = gtk::Button::builder()
+        .label(&i18n("Refresh Catalog"))
+        .halign(gtk::Align::Center)
+        .css_classes(["suggested-action", "pill"])
+        .build();
+    empty_page.set_child(Some(&refresh_btn));
+
+    let stack = gtk::Stack::new();
+    stack.add_named(&empty_page, Some("empty"));
+    stack.add_named(&scrolled, Some("results"));
+
+    // Show empty or results based on catalog data
+    let app_count = db.catalog_app_count().unwrap_or(0);
+    if app_count > 0 {
+        stack.set_visible_child_name("results");
+        title.set_subtitle(&format!("{} apps available", app_count));
+    } else {
+        stack.set_visible_child_name("empty");
+    }
+
+    toast_overlay.set_child(Some(&stack));
+
+    let toolbar_view = adw::ToolbarView::new();
+    toolbar_view.add_top_bar(&header);
+    toolbar_view.set_content(Some(&toast_overlay));
+
+    // Refresh button in header
+    let refresh_header_btn = gtk::Button::builder()
+        .icon_name("view-refresh-symbolic")
+        .tooltip_text(&i18n("Refresh catalog"))
+        .build();
+    header.pack_end(&refresh_header_btn);
+
+    // Category chips state
+    let active_category: Rc<RefCell<Option<String>>> = Rc::new(RefCell::new(None));
+
+    // Populate categories
+    populate_categories(db, &category_box, &active_category, &results_box, &search_entry);
+
+    // Initial population
+    populate_results(db, "", None, &results_box, &toast_overlay);
+
+    // Search handler
+    {
+        let db_ref = db.clone();
+        let results_ref = results_box.clone();
+        let toast_ref = toast_overlay.clone();
+        let cat_ref = active_category.clone();
+        search_entry.connect_search_changed(move |entry| {
+            let query = entry.text().to_string();
+            let cat = cat_ref.borrow().clone();
+            populate_results(&db_ref, &query, cat.as_deref(), &results_ref, &toast_ref);
+        });
+    }
+
+    // Refresh handler (both buttons)
+    let wire_refresh = |btn: &gtk::Button| {
+        let db_ref = db.clone();
+        let stack_ref = stack.clone();
+        let results_ref = results_box.clone();
+        let toast_ref = toast_overlay.clone();
+        let title_ref = title.clone();
+        let cat_box_ref = category_box.clone();
+        let active_cat_ref = active_category.clone();
+        let search_ref = search_entry.clone();
+
+        btn.connect_clicked(move |btn| {
+            btn.set_sensitive(false);
+            let db_c = db_ref.clone();
+            let stack_c = stack_ref.clone();
+            let results_c = results_ref.clone();
+            let toast_c = toast_ref.clone();
+            let title_c = title_ref.clone();
+            let btn_c = btn.clone();
+            let cat_box_c = cat_box_ref.clone();
+            let active_cat_c = active_cat_ref.clone();
+            let search_c = search_ref.clone();
+
+            glib::spawn_future_local(async move {
+                let db_bg = Database::open().ok();
+                let result = gio::spawn_blocking(move || {
+                    if let Some(ref db) = db_bg {
+                        catalog::sync_catalog(db, &catalog::CatalogSource {
+                            id: Some(1),
+                            name: "AppImageHub".to_string(),
+                            url: "https://appimage.github.io/feed.json".to_string(),
+                            source_type: catalog::CatalogType::AppImageHub,
+                            enabled: true,
+                            last_synced: None,
+                            app_count: 0,
+                        }).map_err(|e| e.to_string())
+                    } else {
+                        Err("Failed to open database".to_string())
+                    }
+                }).await;
+
+                btn_c.set_sensitive(true);
+
+                match result {
+                    Ok(Ok(count)) => {
+                        toast_c.add_toast(adw::Toast::new(
+                            &format!("Catalog refreshed: {} apps", count),
+                        ));
+                        title_c.set_subtitle(&format!("{} apps available", count));
+                        stack_c.set_visible_child_name("results");
+                        populate_categories(&db_c, &cat_box_c, &active_cat_c, &results_c, &search_c);
+                        populate_results(&db_c, "", None, &results_c, &toast_c);
+
+                        // Store refresh timestamp
+                        let settings = gio::Settings::new(crate::config::APP_ID);
+                        let now = chrono::Utc::now().to_rfc3339_opts(chrono::SecondsFormat::Secs, true);
+                        settings.set_string("catalog-last-refreshed", &now).ok();
+                    }
+                    Ok(Err(e)) => {
+                        log::error!("Catalog refresh failed: {}", e);
+                        toast_c.add_toast(adw::Toast::new("Catalog refresh failed"));
+                    }
+                    Err(_) => {
+                        log::error!("Catalog refresh thread panicked");
+                        toast_c.add_toast(adw::Toast::new("Catalog refresh failed"));
+                    }
+                }
+            });
+        });
+    };
+
+    wire_refresh(&refresh_btn);
+    wire_refresh(&refresh_header_btn);
+
+    adw::NavigationPage::builder()
+        .title(&i18n("Catalog"))
+        .tag("catalog")
+        .child(&toolbar_view)
+        .build()
+}
+
+fn populate_results(
+    db: &Rc<Database>,
+    query: &str,
+    category: Option<&str>,
+    list_box: &gtk::ListBox,
+    toast_overlay: &adw::ToastOverlay,
+) {
+    // Clear existing
+    while let Some(row) = list_box.row_at_index(0) {
+        list_box.remove(&row);
+    }
+
+    let results = db.search_catalog(query, category, 50).unwrap_or_default();
+
+    if results.is_empty() {
+        let empty_row = adw::ActionRow::builder()
+            .title(&i18n("No results"))
+            .subtitle(&i18n("Try a different search or refresh the catalog"))
+            .build();
+        list_box.append(&empty_row);
+        return;
+    }
+
+    let toast_ref = toast_overlay.clone();
+    let db_ref = db.clone();
+
+    for app in &results {
+        let row = adw::ActionRow::builder()
+            .title(&app.name)
+            .activatable(true)
+            .build();
+
+        if let Some(ref desc) = app.description {
+            let snippet: String = desc.chars().take(80).collect();
+            let subtitle = if snippet.len() < desc.len() {
+                format!("{}...", snippet.trim_end())
+            } else {
+                snippet
+            };
+            row.set_subtitle(&subtitle);
+        }
+
+        // Category badges
+        if let Some(ref cats) = app.categories {
+            let first_cat: String = cats.split(';').next().unwrap_or("").to_string();
+            if !first_cat.is_empty() {
+                let badge = widgets::status_badge(&first_cat, "neutral");
+                badge.set_valign(gtk::Align::Center);
+                row.add_suffix(&badge);
+            }
+        }
+
+        // Install button
+        let install_btn = gtk::Button::builder()
+            .label(&i18n("Install"))
+            .valign(gtk::Align::Center)
+            .css_classes(["suggested-action"])
+            .build();
+
+        let download_url = app.download_url.clone();
+        let app_name = app.name.clone();
+        let homepage = app.homepage.clone();
+        let toast_install = toast_ref.clone();
+        let db_install = db_ref.clone();
+
+        install_btn.connect_clicked(move |btn| {
+            btn.set_sensitive(false);
+            btn.set_label("Installing...");
+
+            let url = download_url.clone();
+            let name = app_name.clone();
+            let hp = homepage.clone();
+            let toast_c = toast_install.clone();
+            let btn_c = btn.clone();
+            let db_c = db_install.clone();
+
+            glib::spawn_future_local(async move {
+                let result = gio::spawn_blocking(move || {
+                    let install_dir = dirs::home_dir()
+                        .unwrap_or_else(|| std::path::PathBuf::from("/tmp"))
+                        .join("Applications");
+                    std::fs::create_dir_all(&install_dir).ok();
+
+                    let app = catalog::CatalogApp {
+                        name: name.clone(),
+                        description: None,
+                        categories: Vec::new(),
+                        latest_version: None,
+                        download_url: url,
+                        icon_url: None,
+                        homepage: hp,
+                        file_size: None,
+                        architecture: None,
+                    };
+
+                    catalog::install_from_catalog(&app, &install_dir)
+                        .map_err(|e| e.to_string())
+                }).await;
+
+                match result {
+                    Ok(Ok(path)) => {
+                        // Register in DB
+                        let filename = path.file_name()
+                            .map(|n| n.to_string_lossy().to_string())
+                            .unwrap_or_default();
+                        let size = std::fs::metadata(&path)
+                            .map(|m| m.len() as i64)
+                            .unwrap_or(0);
+                        db_c.upsert_appimage(
+                            &path.to_string_lossy(),
+                            &filename,
+                            Some(2),
+                            size,
+                            true,
+                            None,
+                        ).ok();
+                        toast_c.add_toast(adw::Toast::new("Installed successfully"));
+                        btn_c.set_label("Installed");
+                    }
+                    Ok(Err(e)) => {
+                        log::error!("Install failed: {}", e);
+                        toast_c.add_toast(adw::Toast::new("Install failed"));
+                        btn_c.set_sensitive(true);
+                        btn_c.set_label("Install");
+                    }
+                    Err(_) => {
+                        log::error!("Install thread panicked");
+                        toast_c.add_toast(adw::Toast::new("Install failed"));
+                        btn_c.set_sensitive(true);
+                        btn_c.set_label("Install");
+                    }
+                }
+            });
+        });
+
+        row.add_suffix(&install_btn);
+        list_box.append(&row);
+    }
+}
+
+fn populate_categories(
+    db: &Rc<Database>,
+    category_box: &gtk::Box,
+    active_category: &Rc<RefCell<Option<String>>>,
+    results_box: &gtk::ListBox,
+    search_entry: &gtk::SearchEntry,
+) {
+    // Clear existing
+    while let Some(child) = category_box.first_child() {
+        category_box.remove(&child);
+    }
+
+    let categories = db.get_catalog_categories().unwrap_or_default();
+    if categories.is_empty() {
+        return;
+    }
+
+    // "All" chip
+    let all_btn = gtk::ToggleButton::builder()
+        .label(&i18n("All"))
+        .active(true)
+        .css_classes(["pill"])
+        .build();
+    category_box.append(&all_btn);
+
+    // Top 10 category chips
+    let buttons: Rc<RefCell<Vec<gtk::ToggleButton>>> = Rc::new(RefCell::new(vec![all_btn.clone()]));
+
+    for (cat, _count) in categories.iter().take(10) {
+        let btn = gtk::ToggleButton::builder()
+            .label(cat)
+            .css_classes(["pill"])
+            .build();
+        category_box.append(&btn);
+        buttons.borrow_mut().push(btn.clone());
+
+        let cat_str = cat.clone();
+        let active_ref = active_category.clone();
+        let results_ref = results_box.clone();
+        let search_ref = search_entry.clone();
+        let db_ref = db.clone();
+        let buttons_ref = buttons.clone();
+        btn.connect_toggled(move |btn| {
+            if btn.is_active() {
+                // Deactivate others
+                for other in buttons_ref.borrow().iter() {
+                    if other != btn {
+                        other.set_active(false);
+                    }
+                }
+                *active_ref.borrow_mut() = Some(cat_str.clone());
+                let query = search_ref.text().to_string();
+                // Use a dummy toast overlay for filtering
+                let toast = adw::ToastOverlay::new();
+                populate_results(&db_ref, &query, Some(&cat_str), &results_ref, &toast);
+            }
+        });
+    }
+
+    // "All" button handler
+    {
+        let active_ref = active_category.clone();
+        let results_ref = results_box.clone();
+        let search_ref = search_entry.clone();
+        let db_ref = db.clone();
+        let buttons_ref = buttons.clone();
+        all_btn.connect_toggled(move |btn| {
+            if btn.is_active() {
+                for other in buttons_ref.borrow().iter() {
+                    if other != btn {
+                        other.set_active(false);
+                    }
+                }
+                *active_ref.borrow_mut() = None;
+                let query = search_ref.text().to_string();
+                let toast = adw::ToastOverlay::new();
+                populate_results(&db_ref, &query, None, &results_ref, &toast);
+            }
+        });
+    }
+}
diff --git a/src/ui/mod.rs b/src/ui/mod.rs
index 22bce26..0a37497 100644
--- a/src/ui/mod.rs
+++ b/src/ui/mod.rs
@@ -1,5 +1,6 @@
 pub mod app_card;
 pub mod batch_update_dialog;
+pub mod catalog_view;
 pub mod cleanup_wizard;
 pub mod dashboard;
 pub mod detail_view;
diff --git a/src/window.rs b/src/window.rs
index f348270..9c56b45 100644
--- a/src/window.rs
+++ b/src/window.rs
@@ -17,6 +17,7 @@ use crate::core::security;
 use crate::core::updater;
 use crate::core::watcher;
 use crate::i18n::{i18n, ni18n_f};
+use crate::ui::catalog_view;
 use crate::ui::cleanup_wizard;
 use crate::ui::dashboard;
 use crate::ui::detail_view;
@@ -150,6 +151,7 @@ impl DriftwoodWindow {
         section2.append(Some(&i18n("Find Duplicates")), Some("win.find-duplicates"));
         section2.append(Some(&i18n("Security Report")), Some("win.security-report"));
         section2.append(Some(&i18n("Disk Cleanup")), Some("win.cleanup"));
+        section2.append(Some(&i18n("Browse Catalog")), Some("win.catalog"));
         menu.append_section(None, &section2);
 
         let section3 = gio::Menu::new();
@@ -566,6 +568,16 @@ impl DriftwoodWindow {
             })
             .build();
 
+        // Catalog browser action
+        let catalog_action = gio::ActionEntry::builder("catalog")
+            .activate(|window: &Self, _, _| {
+                let db = window.database().clone();
+                let catalog_page = catalog_view::build_catalog_page(&db);
+                let nav = window.imp().navigation_view.get().unwrap();
+                nav.push(&catalog_page);
+            })
+            .build();
+
         // Show keyboard shortcuts dialog
         let shortcuts_action = gio::ActionEntry::builder("show-shortcuts")
             .activate(|window: &Self, _, _| {
@@ -595,6 +607,7 @@ impl DriftwoodWindow {
             find_duplicates_action,
             security_report_action,
             cleanup_action,
+            catalog_action,
             shortcuts_action,
             show_drop_hint_action,
         ]);
@@ -929,6 +942,9 @@ impl DriftwoodWindow {
         let db = self.database();
         let library_view = self.imp().library_view.get().unwrap();
 
+        // Ensure default catalog sources exist
+        crate::core::catalog::ensure_default_sources(db);
+
         match db.get_all_appimages() {
             Ok(records) if !records.is_empty() => {
                 library_view.populate(records);