Compiled and verified by Vincent Wesley Couey · independent researcher · methodology & sources · pricing checked 2026-08-11.
The three-way table
Suno, Udio and Riffusion all turn a text prompt into a song with vocals, and in a thirty-second demo they are hard to separate. The differences appear at the point of use: how long the track can be, how much of it you can revise without regenerating from scratch, and whether the licence lets you publish what you made.
| Dimension | Suno | Udio | Riffusion |
|---|---|---|---|
| Free tier | Yes, credit-limited | Yes, credit-limited | Yes, the most generous of the three |
| Commercial rights on free tier | No | No | No |
| Commercial rights on paid | Yes, on paid tiers | Yes, on paid tiers | Check current terms before release |
| Finished-sounding output | Strongest | Strong, more variable | Good for the price |
| Vocal realism | Strong | Strongest | Weaker |
| Editing and revision control | Section-level | Finest grained | Basic |
| Best for | Finished tracks fast | Vocal-led songs you will iterate on | Experimentation and sketching |
Status note, checked 12 August 2026: riffusion.com redirects to Flow Music, presenting as Google Flow Music on a Lyria 3.5 model. The Riffusion column below describes the product as it was evaluated; anyone choosing it today is choosing Flow Music and should read that site's own pricing and terms.
Licensing is the axis that should decide this, not audio quality
Licensing separates these three far more decisively than sound does. All three offer a free tier, and on all three the free tier is for evaluation rather than release. Generating a track you like on a free plan and then discovering you cannot publish it is the single most common and most expensive mistake in this category.
Suno and Udio both grant commercial usage rights on paid plans, with the specifics varying by tier. Riffusion's terms should be read directly before any commercial release, because its positioning has been closer to experimentation than to publishing.
Two consequences follow. If the track is going into a client deliverable, a monetised video or a commercial release, the paid tier is not optional and the licence is the thing you are actually buying. If the track is a sketch, a demo or a personal project, the free tiers are genuinely useful and you should not pay for any of them yet.
For the broader legal picture around selling AI-generated music, see our coverage of which AI music generators are safe to sell.
Audio quality: Suno finishes, Udio performs
Suno produces the most finished-sounding output of the three with the least effort. Its mixes arrive closer to something you could drop into a video without further work, which is why it is the default recommendation for anyone whose goal is a usable track rather than a creative process.
Udio's strength is vocal realism and the granularity of its revision controls. If you care about the performance rather than the arrangement, and you are willing to iterate rather than accept a first generation, Udio rewards that patience in a way Suno does not.
Riffusion is weaker on both axes and cheaper on all of them, which makes it the right tool for exploring an idea before committing a paid generation elsewhere. Judging any of the three on a curated demo reel is a mistake; judge them on your own prompt, in the genre you actually work in, because all three are markedly stronger in some genres than others.
Alternatives when a song is not what you need
A generated song is the wrong product for a great many jobs. If you need background music under a video, a bed for a podcast, or a loop for an app, several tools solve that more cheaply and with cleaner licensing.
- Soundraw is built for exactly that job, generating royalty-free instrumental beds you can customise by mood and length.
- Mubert targets creators and apps that need continuous generated audio rather than discrete songs.
- Beatoven composes to a video's emotional arc, which is a genuinely different workflow from prompting for a song.
- Loudly is worth a look for volume needs where per-track cost matters more than uniqueness.
- Stable Audio suits sound design and shorter audio elements more than full songs.
For the full ranked field, see our comparison of the best AI music generators, and for tracks destined for video specifically, the best AI music for videos.
Which one should you actually pick
You want a usable track today
Suno. It gets closest to finished with the least fighting, and that is worth more than marginal quality gains elsewhere.
The vocal is the point
Udio. Better vocal realism and finer revision control, if you are willing to iterate rather than accept the first generation.
You are experimenting, not releasing
Riffusion. Cheapest way to explore an idea, and the free tier is the most generous of the three.
You need background music under video
None of these. Soundraw or Beatoven solve that job more cheaply with cleaner licensing.
You are releasing commercially
Pay, and read the licence for your specific tier first. The free tiers do not grant commercial rights on any of the three.
You work in one narrow genre
Test all three on your own prompt before subscribing. Genre strength varies more between these tools than overall quality does.
Get the AI music licensing sheet
Which tiers grant commercial rights, which retain them, and the questions to ask before you release a track. One email, no noise.
Frequently asked questions
Can I sell music made with Suno or Udio?
Both Suno and Udio grant commercial usage rights on paid plans, with specifics that vary by tier, and neither grants them on the free tier. Riffusion's terms should be read directly before any commercial release. Because licensing terms in this category are revised more often than pricing, confirm on the vendor's own terms page before you release a track rather than relying on any third-party summary.
Which AI music generator sounds the best?
Suno produces the most finished-sounding full tracks with the least effort, and Udio has the stronger vocal realism if you are willing to iterate. None of the three publishes a reproducible audio-quality metric, so any specific quality score you see quoted cannot be sourced. Genre matters more than overall ranking, so test your own prompt before subscribing.
Is there a free AI music generator?
All three offer a free tier, and Riffusion's is the most generous. None of the free tiers grants commercial rights, so they are best used for evaluation and sketching rather than for anything you intend to publish.
What is the best AI music tool for background music in videos?
None of these three, in most cases. Soundraw and Beatoven are built specifically for royalty-free instrumental beds under video and usually solve that job more cheaply and with simpler licensing than a song generator does.
Suno vs Udio: which should a beginner start with?
Suno, for most beginners. It reaches a usable result faster and with less prompt engineering, which matters more early on than the finer control Udio offers. Move to Udio when you find yourself wanting to revise a specific section rather than regenerate the whole track.