OS-39: Music Player & Streamer

Experience your music collection through a lens of clean design and technical
precision. OS-39 is a premium Digital Audio Player (DAP) designed for those
who value their music — whether stored locally on-device or hosted on their
own server — offering a focused listening experience without subscriptions,
ads, or distractions.

YOUR COLLECTION, YOUR WAY

OS-39 is built for your music. Import your high-quality audio files directly
from the Files app using advanced in-place linking, or stream directly from
your self-hosted WebDAV, Navidrome, or Plex server.

Whether it's FLAC, ALAC, M4A, or MP3, OS-39 handles your high-fidelity
files with ease — locally or over the network.

STREAM YOUR SELF-HOSTED MUSIC

For Pro users, OS-39 connects to your personal WebDAV server, Navidrome server, or Plex Media
Server and lets you browse your remote library folder by folder. Stream any
supported audio file directly, or import albums and tracks into your local
library for offline playback. Credentials are stored securely in the system
Keychain — enter them once and never again.

Supports WebDAV-compatible servers (NAS devices, HTTP servers, etc.), Navidrome servers, and
Plex Media Server. Streams M4A, MP3, FLAC, AAC, WAV, AIFF, and ALAC.

IMMERSIVE VISUALS

Get lost in the music with reactive visualizers. From the fluid "Aurora"
backgrounds to the tactile "Ripple" fields, your screen becomes a functional
extension of the soundscape.

PRO-GRADE AUDIO CONTROL

Tailor every track with a simple 5-band or professional 10-band ISO
Equalizer. Save custom EQ profiles for specific albums or playlists to
ensure your gear always sounds its best.

SMART DISCOVERY

The on-device OS-39 Recommendation Engine learns your habits based on time,
day, and season. Rediscover your library with "Forgotten Gems" and
personalised daily suggestions that never leave your device. Your data stays
private and secure. View how the Engine works — and enable or disable it —
directly in the app.

KEY FEATURES

• Gapless Playback & Customisable Crossfade (Pro)
• 10-Band Equalizer with Presets (Pro)
• Stream from WebDAV & Plex Servers (Pro)
• Import Remote Music to Local Library (Pro)
• Import Your Music: Play directly from the Files app
• Beautiful Aesthetic Themes: Vocaloid, Sakura, Tokyo Tower, and more
• Interactive Widgets: Quick access to your favourites and recent plays
• Haptic Feedback: A tactile, mechanical feel to every interaction
• Privacy First: No tracking, no data collection

UPGRADE TO PRO

Unlock the full OS-39 experience with a simple one-time purchase.
No subscriptions, forever.

• Advanced Playback: Gapless & Crossfade
• Full 10-Band Equalizer Access
• Self-Hosted Streaming: WebDAV & Plex
• Import Remote Music to Your Local Library
• Exclusive Premium Themes
• Exclusive Visualizers
• Enhanced Library Intelligence

Elevate your listening experience. Welcome to OS-39.