diff --git a/src/lib/generateInstallScript.ts b/src/lib/generateInstallScript.ts
index e951731..316b13a 100644
--- a/src/lib/generateInstallScript.ts
+++ b/src/lib/generateInstallScript.ts
@@ -9,7 +9,7 @@ import {
     generateArchScript,
     generateFedoraScript,
     generateOpenSUSEScript,
-    generateNixScript,
+    generateNixConfig,
     generateFlatpakScript,
     generateSnapScript,
     generateHomebrewScript,
@@ -21,10 +21,7 @@ interface ScriptOptions {
     helper?: 'yay' | 'paru';
 }
 
-/**
- * Generate a full install script with progress bars, error handling,
- * and all the fancy stuff. This is what gets downloaded as .sh file.
- */
+// Full install script for download. Nix gets a config file, others get shell scripts.
 export function generateInstallScript(options: ScriptOptions): string {
     const { distroId, selectedAppIds, helper = 'yay' } = options;
     const distro = distros.find(d => d.id === distroId);
@@ -40,7 +37,7 @@ export function generateInstallScript(options: ScriptOptions): string {
         case 'arch': return generateArchScript(packages, helper);
         case 'fedora': return generateFedoraScript(packages);
         case 'opensuse': return generateOpenSUSEScript(packages);
-        case 'nix': return generateNixScript(packages);
+        case 'nix': return generateNixConfig(packages);
         case 'flatpak': return generateFlatpakScript(packages);
         case 'snap': return generateSnapScript(packages);
         case 'homebrew': return generateHomebrewScript(packages);
@@ -61,7 +58,7 @@ export function generateSimpleCommand(selectedAppIds: Set<string>, distroId: Dis
         case 'arch': return `yay -S --needed --noconfirm ${pkgList}`;
         case 'fedora': return `sudo dnf install -y ${pkgList}`;
         case 'opensuse': return `sudo zypper install -y ${pkgList}`;
-        case 'nix': return `nix-env -iA ${packages.filter(p => p.pkg.trim()).map(p => `nixpkgs.${p.pkg.trim()}`).join(' ')}`;
+        case 'nix': return generateNixConfig(packages);
         case 'flatpak': return `flatpak install flathub -y ${pkgList}`;
         case 'snap':
             if (packages.length === 1) return `sudo snap install ${pkgList}`;
diff --git a/src/lib/nixUnfree.ts b/src/lib/nixUnfree.ts
new file mode 100644
index 0000000..b845e7b
--- /dev/null
+++ b/src/lib/nixUnfree.ts
@@ -0,0 +1,35 @@
+// Nix unfree package detection - these require allowUnfree = true
+
+export const KNOWN_UNFREE_PACKAGES = new Set([
+    'discord',
+    'slack',
+    'zoom-us',
+    'teams',
+    'skypeforlinux',
+    'google-chrome',
+    'vivaldi',
+    'opera',
+    'spotify',
+    'steam',
+    'heroic',
+    'vscode',
+    'sublime4',
+    'jetbrains.idea-ultimate',
+    'jetbrains.webstorm',
+    'jetbrains.pycharm-professional',
+    'nvidia-x11',
+    'dropbox',
+    '1password',
+    'masterpdfeditor',
+]);
+
+export function isUnfreePackage(pkg: string): boolean {
+    const cleanPkg = pkg.trim().toLowerCase();
+    if (KNOWN_UNFREE_PACKAGES.has(cleanPkg)) return true;
+
+    // Nested packages like jetbrains.idea-ultimate
+    for (const unfree of KNOWN_UNFREE_PACKAGES) {
+        if (cleanPkg.includes(unfree)) return true;
+    }
+    return false;
+}
diff --git a/src/lib/scripts/index.ts b/src/lib/scripts/index.ts
index fa2d357..7c451be 100644
--- a/src/lib/scripts/index.ts
+++ b/src/lib/scripts/index.ts
@@ -6,7 +6,7 @@ export { generateDebianScript } from './debian';
 export { generateArchScript } from './arch';
 export { generateFedoraScript } from './fedora';
 export { generateOpenSUSEScript } from './opensuse';
-export { generateNixScript } from './nix';
+export { generateNixConfig } from './nix';
 export { generateFlatpakScript } from './flatpak';
 export { generateSnapScript } from './snap';
 export { generateHomebrewScript } from './homebrew';
diff --git a/src/lib/scripts/nix.ts b/src/lib/scripts/nix.ts
index 4addaf2..2c39286 100644
--- a/src/lib/scripts/nix.ts
+++ b/src/lib/scripts/nix.ts
@@ -1,55 +1,22 @@
-// Nix script - nix-env
+// Nix declarative config generator
 
-import { generateAsciiHeader, generateSharedUtils, escapeShellString, type PackageInfo } from './shared';
+import { type PackageInfo } from './shared';
+import { isUnfreePackage } from '../nixUnfree';
 
-export function generateNixScript(packages: PackageInfo[]): string {
-    return generateAsciiHeader('Nix', packages.length) + generateSharedUtils(packages.length) + `
-is_installed() { nix-env -q 2>/dev/null | grep -q "$1"; }
+export function generateNixConfig(packages: PackageInfo[]): string {
+    const validPackages = packages.filter(p => p.pkg.trim());
+    if (validPackages.length === 0) return '# No packages selected';
 
-install_pkg() {
-    local name=$1 attr=$2
-    CURRENT=$((CURRENT + 1))
-    
-    if is_installed "$attr"; then
-        skip "$name"
-        SKIPPED+=("$name")
-        return 0
-    fi
-    
-    show_progress $CURRENT $TOTAL "$name"
-    local start=$(date +%s)
-    
-    local output
-    if output=$(with_retry nix-env -iA "nixpkgs.$attr"); then
-        local elapsed=$(($(date +%s) - start))
-        update_avg_time $elapsed
-        printf "\\r\\033[K"
-        timing "$name" "$elapsed"
-        SUCCEEDED+=("$name")
-    else
-        printf "\\r\\033[K\${RED}✗\${NC} %s\\n" "$name"
-        if echo "$output" | grep -q "attribute.*not found"; then
-            echo -e "    \${DIM}Attribute not found\${NC}"
-        fi
-        FAILED+=("$name")
-    fi
-}
-
-# ─────────────────────────────────────────────────────────────────────────────
-
-command -v nix-env &>/dev/null || { error "nix-env not found"; exit 1; }
-
-info "Updating channels..."
-with_retry nix-channel --update >/dev/null && success "Updated" || warn "Update failed"
-
-echo
-info "Installing $TOTAL packages"
-echo
-
-${packages.filter(p => p.pkg.trim()).map(({ app, pkg }) => `install_pkg "${escapeShellString(app.name)}" "${pkg.trim()}"`).join('\n')}
-
-print_summary
-echo
-info "Restart your shell for new commands."
-`;
+    const sortedPkgs = validPackages.map(p => p.pkg.trim()).sort();
+    const packageList = sortedPkgs.map(pkg => `    ${pkg}`).join('\n');
+
+    // Add unfree warning if needed
+    const unfreePkgs = sortedPkgs.filter(pkg => isUnfreePackage(pkg));
+    const unfreeComment = unfreePkgs.length > 0
+        ? `# Unfree: ${unfreePkgs.join(', ')}\n# Requires: nixpkgs.config.allowUnfree = true;\n\n`
+        : '';
+
+    return `${unfreeComment}environment.systemPackages = with pkgs; [
+${packageList}
+];`;
 }