Private betaSolo builder · own product2026

Linea

A native media companion that shows synced lyrics over whatever you're playing.

Linea notices what is already playing — YouTube, Apple Music, the browser — finds the lyrics and their timing, and floats them over your screen as a native overlay or mini-player on macOS and Windows.

Visit getlinea.pages.dev

Linea column mode: synced lyrics over the album cover — Music and artwork in screenshots: Josh Woodward (joshwoodward.com), CC BY 4.0 — artwork adapted (cropped).

Linea during an instrumental break — Music and artwork in screenshots: Josh Woodward (joshwoodward.com), CC BY 4.0 — artwork adapted (cropped).

The problem

Lyrics apps live inside one player, sync badly and feel like web pages glued to the desktop.

The solution

A Rust core with truly native hosts per platform and on-device speech recognition that aligns every word — no audio ever leaves the machine.

lines of Rust: 67k
native hosts: 2
lyric sources: 5
on-device speech: 100%

Highlights

01
Native hosts per platform: Swift/AppKit overlay on macOS, Win32 + DirectComposition on Windows.
02
On-device speech recognition on Apple Silicon (MLX) for word-level timestamps.
03
Lyric-sync calibration pipeline backed by an ASR benchmark ledger.
04
Beta infrastructure: expiry and update control plus an automated QA matrix.

Attached mode

Linea riding on top of a YouTube music video: synced lyrics as native subtitles, recorded live from the app."Saboteurs" by Josh Woodward (joshwoodward.com), music video youtube.com/watch?v=8Vx18EO_7gA, CC BY 4.0 — screen recording with Linea subtitles over the original.

Architecture

Player→Media bridge
Media bridge→Rust core
Rust core→Lyric sources
Rust core→On-device ASR
Rust core→Swift overlay
Rust core→DirectComposition

Inside the product

Stack

Rust
Tauri
Swift
AppKit
Win32
DirectComposition
Svelte
MLX
Bun

Integrations

Apple Music
YouTube
LRCLIB

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