Volta

A native iOS player for your own music server Subsonic, Jellyfin, Emby, or Plex.

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Home · Picks for You & Recently Played	Now Playing · artwork-tinted player	Album · shuffle / play / download
Artist · stretchy header & top songs	Synced Lyrics · tap to seek, translate	Search · browse genres & lyrics

Features

• Playback Gapless and crossfade, plus an AutoMix mode that (tries to) beat-match tracks. ReplayGain, a sleep timer, and an infinite autoplay queue. Full lock screen, Control Center, and Siri support.

• Audio A 10-band graphic EQ, mono downmix, a 3D spatial widener, and an Audio Signal Path sheet so you can see exactly what's happening to the sound. Lossless / Hi-Res / True Hi-Res badges come from real data.

• Now Playing Backgrounds that take their colour from the artwork, with animated cover art (GIF, APNG, WebP) on supported iOS versions.

• Lyrics Time-synced lyrics (via LRCLIB) with tap-to-seek, on-device translation, bulk download for offline use, and search across the lyrics you've saved.

• Library A Home feed with daily Picks for You, Discovery Station, Heavy Rotation, and genre/artist mixes. Albums, artists, songs, genres, folders, playlists, smart playlists, and hidden albums.

• Offline Multithreaded, resumable downloads with per-track progress, a storage cap that auto-evicts your least-played downloads, and artist profiles that still work with no connection.

• Multi-server Save several servers and switch between them on the fly. Each server can have its own cellular URL that kicks in automatically off Wi-Fi. No server? Try a built-in demo.

• Localized 17 languages with live, in-app switching.

• Lightweight It sits at roughly 30 MB of ram idle on the Home tab (more on that below).

Performance

Volta sizes itself to the device it reads the physical ram tier (3 / 4 / 6 / 8 GB+) and scales every cache and decode budget to match, then leans on disk so very little has to stay in memory.

• ram-tiered artwork cache (48 → 128 MB) and animated-frame decode caps (192 → 768 px)
• Images are never decoded larger than the device's screen
• Animated artwork runs off one shared frame-stepper with a downsampled on-disk frame cache, and caches get evicted on memory pressure
• Scroll and drag are throttled to the display refresh, with CADisplayLink keeping frame pacing steady
• An optional Performance Mode (battery saver) plus Image Loading and Data Caching dials if you want to trade quality for battery

Volta aims to remain as lightweight as possible. During testing, it used approximately the following amount of ram:

Scenario	ram usage
Idle on the Home tab	~30 MB*
Viewing an album with static artwork	~40 MB*
Viewing an album with static artwork while playing music	~50 MB*
Viewing an artist with 15+ albums	~60 MB*
Viewing an artist with 15+ albums while playing music	~70 MB*
Viewing an album with animated artwork	~170 MB*
Viewing an album with animated artwork before optimizations	~2.3 GB*

• tested on iOS 26+, on iOS 16, 17 and 18 results will vary

Supported servers

Backend	Notes
Subsonic / OpenSubsonic	Navidrome (volta works best with), Gonic, Airsonic, Funkwhale, and friends
Jellyfin / Emby	Self-hosted Jellyfin or Emby
Plex	Plex Media Server, with hosted "Sign in with Plex"

Getting started

Join the testflight, or build source.

Building from source

Build it yourself with xtool on Linux, Windows (WSL), and macOS:

xtool devices                       # list connected iPhones and their UDIDs
xtool dev run --udid <DEVICE_UDID>  # build, install, and launch on device

using xtool requires a xcode sdk, downloadable here as well com.apple.developer.carplay-audio removed from entitlements, learn more here (xtool docs)