Sonauto AI review
A browser-based song extender with section directions, stem tools and MIDI drafts.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Sonauto AI is a browser-based music creation and editing service for people who want to extend a track by shaping what comes next. Its extension tool starts from a point the user selects in an uploaded MP3 or a song in the Sonauto library, then takes written direction for the next section. Requests can include an intro, bridge, instrumental break, outro or a longer section. That makes it a fit for solo creators and small teams who want guided continuation rather than only generating a complete song from a prompt. The wider service also generates songs from written prompts or lyrics and offers covers, vocal removal, stem separation and audio-to-MIDI conversion.
The workflow centers on directing a transition: users can specify the next section, then listen to assess how it connects with the source. Uploads are limited to MP3 files up to 100 MB; alternatively, a completed library song can be the source. Supported audio can be converted into a MIDI draft, a useful companion for MIDI-aware workflows, while vocal removal and stem splitting serve editing tasks beyond extension itself. Sonauto is web-based and cloud-deployed, with email support. It may suit creators who want these tools together in a browser, but those seeking an explicitly stated maximum extension length should note that the service says it depends on the source and current limits.
The Free Plan costs nothing and makes songs public by default, with 30-day cloud storage. Starter is $10 per month when billed annually; Plus is $14.50 per month when billed annually. Both paid tiers include song extension, private generations, unlimited MP3/WAV downloads, Vocal Remover, Stem Splitter and 730-day cloud storage. The published plan highlights list the same core features for Starter and Plus. Commercial-use rights apply to eligible generations on annual Starter and Plus, not to free or monthly-plan results. Choose Sonauto if guided continuation and its surrounding audio tools match your workflow; look elsewhere if private generations or downloadable MP3/WAV files are essential on a free plan, or if you need a stated extension-length limit.
Sonauto AI pros and cons
- Where it wins
- Continue from a selected point in an upload or library track
- Direct intros, bridges, breaks, outros or longer sections
- Paid plans include vocal removal, stem splitting and MIDI drafts
- Where it doesn't
- Free songs are public by default and kept in cloud storage for 30 days
- Song extension and MP3/WAV downloads require a paid plan
- Commercial-use rights apply only to eligible annual-plan generations
Sonauto AI fact sheet, pricing and score →
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