Head-to-head · AI Song Extenders
Udio vs Sonauto AI
Udio leads on 0 checks, Sonauto AI on 4, and 3 are even. Who comes out ahead on the 7 yes/no, price and count checks where we have data for both products. The editor score weighs everything else too.
Our verdict
- Highest scoreSonauto AI · 8.1/10
- Free planboth
- Most featuresSonauto AI · 5 of 6
Sonauto AI scores higher on our rubric for ai song extenders: 8.1 against 6.5 out of 10; our editors rank them #5 and #3.
Sonauto AI offers wav export; Udio doesn't publish it. Sonauto AI offers stem export; Udio doesn't. Sonauto AI offers commercial licence; Udio doesn't publish it. Sonauto AI offers style reference; Udio doesn't publish it.
Udio is the better fit for creators extending songs with timeline editing. Sonauto AI is the better fit for guided song sections and MIDI-aware workflows.
- Udio fits best
Creators extending songs with timeline editing
- Sonauto AI fits best
Guided song sections and MIDI-aware workflows
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Side by side
| Feature | Udio 6.5/10 Visit ↗ | Sonauto AI 8.1/10 Visit ↗ |
|---|---|---|
| At a glance | ||
| Editor score | 6.5 | 8.1 |
| Ranking | #3 in AI Song Extenders | #5 in AI Song Extenders |
| Best for | Creators extending songs with timeline editing | Guided song sections and MIDI-aware workflows |
| Pricing model | Free plan + paid | Free plan + paid |
| Starting price | $10/mo | $10/mo |
| Free plan | ✓ | ✓ |
| Free trial | — | — |
| Deployment | Cloud, Mobile | Cloud |
| Platforms | Web, iOS | Web |
| Support | Live chat, Docs | |
| Built for | Solo, Small business | Solo, Small business |
| Features Udio 1/6 · Sonauto AI 5/6 | ||
| Section inpainting | Not published | Not published |
| Audio upload | ✓ | ✓ |
| WAV export | Not published | ✓ (best) |
| Stem export | — | ✓ (best) |
| Commercial licence | Not published | ✓ (best) |
| Style reference | Not published | ✓ (best) |
| Specs | ||
| Max extension length | Not published | Not published |
| Our review | ||
| Pros |
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| Cons |
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| Our verdict | Udio is a cloud and mobile AI music creation service for turning text prompts, lyrics, styles, and voice references into vocal or instrumental songs. It supports automatic or custom lyrics, lyric editing and effects, and lets creators… Read the review → |
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,… Read the review → |
Strengths and trade-offs
Udio — where it wins
- Sessions timeline editing supports song extensions and structured refinement
- Upload audio for extending, remixing, inpainting, and styling
- Voice and style blending plus four-way stem separation
Where it doesn't
- Tracks are limited to about 2.17 minutes
- Audio, video, and stem downloads are disabled during its transition
- Mobile access is limited to iOS
Sonauto AI — 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
- Udio6.5/10 · Free plan · paid from $10/mo · 7-day trial
A flexible AI song editor with Sessions timeline tools, but short tracks and disabled downloads.
Visit UdioFull verdict → - Sonauto AI8.1/10 · Free plan · paid from $10/mo (annual)
A browser-based song extender with section directions, stem tools and MIDI drafts.
Visit SonautoFull verdict →
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All AI song extenders comparisons → · Full ranking →
Reviewed by iTechGuides Editors · Editorial team · Updated Sep 2026