Kerlyss KERLYSS v1.4.4
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Kerlyss v1.4.4 · 100% Free & Open Source

Your Music. Your Cloud.
Synced Across All Your Devices.

An open-source music player with Google Drive cloud sync. Stream across YouTube and Spotify, import playlists instantly, and keep your library in sync across all your devices using your own Google account.

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Android 8.0+ · Windows 10/11 x64 · 100% Free & Open Source
GOOGLE DRIVE SYNC

Your Google Drive is your database.

No middleman servers or proprietary accounts. Kerlyss syncs playlists directly through your personal Google Drive storage.

Google Drive
Private AppData Storage
Connected Device
Auto-Synchronized
Connected Device
Auto-Synchronized
Connected Device
Auto-Synchronized
Zero Middleman Servers
Automatic Background Sync
Sandboxed AppData Access
Smart Conflict Resolution
FEATURES

Built for high fidelity and privacy.

High-resolution playback, custom hardware equalizer, and instant playlist import — 100% free and open source.

Google Drive Cloud Sync

Synchronize playlists and favorites across all devices with your personal Google Drive. Automatic background updates and smart conflict resolution.

1-Click Spotify Playlist Importer

Paste any public Spotify playlist link to extract track names, artists, and album artwork. Kerlyss matches each song with high-quality streaming audio in seconds.

5-Band Equalizer & Presets

Direct frequency control across 60Hz, 230Hz, 910Hz, 4kHz, and 14kHz. Adjust gain curves from -15dB to +15dB or switch between tuned presets: Flat, Bass Boost, Vocal, Electronic, and Rock.

High-Fidelity Audio Engine

Native playback support for 24-bit FLAC, WAV, and ALAC. Includes real-time bitrate display, audio format tags, and smooth proxy stream caching.

Offline Downloads & ID3 Tags

Save songs directly to your preferred storage folder with embedded high-resolution album covers and ID3 metadata tags for portable offline listening.

100% Free & Open Source

No ads, no paid tiers, and zero data tracking. Licensed under GPL-3.0 with complete source code available on GitHub for anyone to audit or contribute to.

DOCUMENTATION

Frequently Asked Questions

Common questions about Google Drive sync, streaming sources, and privacy.

How does sync work with Google Drive?
Kerlyss uses standard Google OAuth2 to communicate directly with an isolated app-data folder (drive.appdata) in your personal Google Drive account. Only your devices have access to this folder. Kerlyss has zero access to your personal files, photos, or emails, and we operate no central servers that could store or read your data.
Do I need a Spotify Premium or YouTube Music subscription?
No subscription is necessary. Kerlyss resolves Spotify playlist metadata through open endpoints and dynamically streams audio from public high-quality media sources in real time.
Where are downloaded audio files stored?
You have full control. Under Settings → Storage & Downloads, you can pick any folder on your device or PC. Files are saved as standard audio files with embedded ID3 metadata and high-resolution album artwork.
Can I use Kerlyss purely as an offline music player?
Yes! Kerlyss indexes your local device storage and plays FLAC, WAV, ALAC, MP3, and AAC files through its hardware audio pipeline without requiring an active internet connection.
Is Kerlyss completely free and open-source?
Yes, 100%. Kerlyss is licensed under the GNU General Public License v3.0 (GPL-3.0). The full source code is public on GitHub, with zero paywalls, zero ads, and zero subscriptions.

SHA-256 Release Signatures

Verify release binary integrity against official production build hashes.

Kerlyss-Android.apk
00C16BEB6C91AC729C56AF56363F6ECA5806A4E48DDD7BC09BAB4AB70F6986A7
Kerlyss-Windows.zip
08DD765A2655D8BC62C47B72779BC9B9CE8BF6A70BE524F6F49CCB171F8F4273