Podcast Chapter Builder

Podcast Chapter Builder is an offline Android app for podcasters, editors, and creators who need precise chapter markers without cloud services or subscriptions. Import a local audio file through Android Storage Access Framework, play it with a built-in Media3 player, and mark chapters with millisecond-accurate timestamps. Each chapter supports a title and optional note so you can capture intros, ad breaks, guest segments, and topic changes while listening. KEY FEATURES - Create and manage local podcast episode projects - Import audio from your device via SAF — no upload required - Play audio with skip -10 sec and +30 sec controls - Add, edit, reorder, and validate chapters with timecodes - Apply reusable chapter templates to speed up repetitive workflows - Export YouTube-style plain text descriptions with timestamps - Export structured JSON chapter files for other tools and platforms - Share exported text through the Android Sharesheet - Save exports to any folder you choose via document APIs - Fully offline: no account, no ads, no analytics, no backend WORKFLOW 1. Create a project with episode title, host/show name, and summary. 2. Attach a local audio file to the project. 3. Listen in the player and add chapters at the right moments. 4. Fine-tune timestamps, titles, and notes on the chapters screen. 5. Export as TXT for YouTube descriptions or JSON for integrations. PRIVACY All data stays on your device. The app does not collect, transmit, or sell user data. Audio files are referenced by local URI only — nothing is copied to a server. Built with Kotlin, Jetpack Compose, Material 3, Room, and Media3 ExoPlayer.