Lacuna

Lacuna's page presents a browser-based AI music platform built around a Music Agent on a visual canvas. Users can describe a song, paste lyrics, hum a melody, upload a photo, or start from their own recording to generate songs with vocals and instrumentals. Existing tracks can be edited with Region Edit (rewriting lyrics for one section), remixed in new styles, extended with new sections, given new album art, have their voice changed via voice cover, be autotuned, split into stems (two, four, or six), and mastered with presets. The site also lists many standalone tools for stem separation, audio cleanup, MIDI and notation conversion, lyric timing (LRC and SRT), lyric videos, visualizers, audio conversion, and key/BPM detection. A free account includes monthly credits with no credit card required; paid users receive commercial rights to generated music according to the FAQ. The page also mentions a developer API, SDK, MCP server, and CLI.

Key features

• Generate complete songs with AI vocals and instrumentals from text, lyrics, hummed melodies, photos, or MIDI
• Music Agent on a visual canvas that drafts two directions and supports remixing, extending, and mastering
• Region Edit to regenerate lyrics for one section of a song while keeping the rest unchanged
• Remix a whole song in a new style while using the original audio as reference
• Extend a song with a new section written from chosen lyrics or AI-continued lyrics
• Album art generation applied to a track without changing its audio
• Voice cover that keeps lyrics, melody, and backing track while changing the singer
• Autotune for vocal pitch correction with adjustable strength
• Stem splitting into two, four, or six stems with mixer controls and per-stem MP3 download
• AI mastering with reference presets, LUFS and true peak readings, and WAV or MP3 output
• Browser-based MIDI editor, MIDI and sheet music conversion, and MIDI to audio export
• Word-level timed lyrics (LRC), lyric SRT subtitles, lyric video maker, and music visualizer
• Audio format converters, BPM and key finder, key changer, and audio speed changer
• Free account with monthly credits and no credit card required to start
• Developer tools listed: REST API, TypeScript SDK, MCP server, and command-line toolkit

Best suited for

• Songwriters and musicians creating original songs with AI vocals
• Creators who need background music, jingles, or personalized songs
• Producers who want to separate, remix, extend, or master existing tracks
• Music students and teachers working with sheet music, MIDI, or sight reading
• Video and social media creators making lyric videos or music visualizers
• Developers integrating music generation through the listed API and SDK

Pricing

Free to start with monthly credits and no credit card required; paid plans offer more credits, downloads, and commercial use. Specific plan prices are not stated on the page.