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Building Monolith — A Flutter Music Player That Actually Works Offline

Engineering articleBy Naveed Sohail Gung2026-06-02FlutterDartMobileiOS

How I built an open-source, offline-first music player for iOS and Android in one Dart codebase — it downloads YouTube audio straight to your device with no backend, no subscription, and no ads.

Article summary

How I built an open-source, offline-first music player for iOS and Android in one Dart codebase — it downloads YouTube audio straight to your device with no backend, no subscription, and no ads.

What this article covers

The Problem If you’ve ever tried to listen to music on a plane, in a tunnel, or somewhere without a reliable connection, you know the frustration: the stream cuts out, the app greys out, and suddenly your curated playlist is gone. I built Monolith to solve that for myself. Monolith is an open-source offline music player for iOS and Android. You paste a YouTube link, it downloads the audio, and from then on the track lives on your device. No...

Topics and technologies

  • Flutter
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  • Dart
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  • Mobile
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  • iOS
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  • Android
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  • CI/CD
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