Sonauto AI
Sonauto AIFree unlimited AI songs — for sonautoai.NET
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◈ Free · unlimited · diffusion

From noise to a full song.

Sonauto AI turns a prompt or your lyrics into a complete track with its Melodia diffusion model — free, unlimited, no sign-up, with tags, inpainting and stems.

Make a song free → See how it works
$0 foreverunlimited songs
Melodialatent diffusion
Up to 4:45V3 Preview
MELODIA · DENOISE
How it works

A prompt in, a song out

No instruments, no sign-up, no daily credit anxiety.

01

Describe & tag

Type a prompt or lyrics, pick from thousands of tags or Auto Tags, set a Custom Style and strength sliders.

02

Diffuse

Melodia denoises that into a coherent full song — with lyrics if you want — returning multiple variants in seconds.

03

Refine & export

Inpaint a line, extend the track, edit a section, split stems or remix — then download. Always free.

The differentiator

Diffusion, not tokens

Most rivals translate music into discrete tokens like words. Sonauto's Melodia model uses latent diffusion — the same class of tech behind Midjourney — working in a continuous space the founders say gives more fluid control and coherent long-form lyrics, with tracks up to about 4:45 on V3 Preview.

  • Continuous latent space, not word-like tokens
  • Coherent lyrics + long-form structure
  • Backed by the founders' published research
  • Built by Ryan Tremblay & Hayden Housen
Who it's for

Made for anyone with $0 and an idea

🎈

Hobbyists

Unlimited free experiments — personalized birthday, wedding and parody songs.

🕹️

Indie devs

Placeholder and ambient tracks during development at zero cost.

🎙️

Podcasters

Custom intros, outros and beds that match the show's vibe.

📚

Educators

Catchy learning songs to help students memorize concepts.

The toolkit

Surprisingly deep for free — said plainly

What's strong here — and where paid tools still pull ahead.

🌫️

Diffusion text-to-song (Melodia)

The core: prompt, lyrics or melody into a full, structured song with coherent vocals — free and unlimited, the reason most people come to Sonauto.

🏷️

Thousands of tags

Precise style, mood and instrument control, or Auto Tags.

🩹

Inpainting

Rewrite a lyric or section, auto or manual, pinpoint.

➕

Extend & edit

Add 60-80s or more; edit individual sections.

🎚️

Stems & remix

Export vocals/drums/bass/instrumental; remix tracks.

🌐

Community playground & API

A generative audio playground with sharing, remix challenges and a radio station, plus a developer API (~$11/mo, ~20k credits). Note: commercial licensing is widely described as unclear — see below.

Honest comparison

Where Sonauto wins — and where it doesn't

A straight read against the paid leaders. None is best at everything.

CapabilitySonauto AISunoUdio
Price & limitsFree & unlimited~$10/mo, capped free~$10/mo
EngineLatent diffusionToken-basedToken-based
Inpainting / section rewriteYesPartialPartial
Commercial licensing clarityWidely called unclearClearClear
Vocal naturalness consistencyCan sound unnaturalSlight edgeSlight edge
Precise control / advanced editingMore limitedMoreMore
Generation / edit speedCan be slowFastFast
What users say

Real reactions, mixed ones included

★★★★★

"I generated 150+ songs and never paid a cent. For demos, learning and personal projects there's genuinely no better free option in 2026."

— 30-day reviewer
★★★★★

"The tag system gives real control over instruments and style, and V3 is a big clarity jump over V2.2. Short, sharp tag combos work best."

— AI music creator
★★★★☆

"Amazing that it's free and unlimited. But the licensing is unclear, AI vocals can sound unnatural, and editing can be slow — I keep Suno for commercial work."

— producer, mixed review
The honest take

The best free option — with real caveats

Sonauto, from founders Ryan Tremblay and Hayden Housen, made an audacious bet: make a genuinely powerful, latent-diffusion music generator completely free and unlimited. The Melodia model and its continuous-space approach are a real technical differentiator, not marketing — and the no-credit-cap freedom is rare.

It isn't a clean win for every use, and pretending otherwise wouldn't help you. The single biggest caveat reviewers raise is unclear commercial licensing: Sonauto's terms say you own what you generate, yet testers repeatedly advise sticking with Suno, Udio or AIVA for serious commercial work. AI vocals can sound unnatural, precise control and advanced editing trail paid tools, generation and editing can be slow, results swing with prompt specificity, and the broader ethics of training data remain unresolved.

What it nails: unlimited free creation with a genuinely different engine, deep tag control, inpainting, stems and a lively remix community — an unmatched sandbox for experimentation and learning.

Read that way, Sonauto is the standout free choice for hobbyists, demos and prototyping. For licensed commercial delivery, treat it as phase one and confirm terms before you ship.

Key facts

Category
Free text-to-song generator
Official site
sonauto.ai
Founders
Ryan Tremblay · Hayden Housen
Engine
Latent diffusion — "Melodia"
Price
100% free & unlimited
Max length
~4:45 (V3 Preview)
Editing
Inpainting · extend · stems · remix
API
~$11/mo, ~20k credits
Caveat
Licensing widely called unclear
Best for
Free experimentation & demos
FAQ

Questions, answered straight

What is Sonauto AI?
A free, unlimited text-to-song generator. Give it a prompt, lyrics or a melody and its Melodia model produces a full song. It's built on latent diffusion rather than a language-model token approach, which the founders say gives more control.
Is it really free and unlimited?
Yes — the core service is completely free with unlimited generation and no subscription, its biggest draw versus tools that cap daily credits. A paid developer API exists for large-scale use at roughly 20,000 credits a month.
What is Melodia / latent diffusion?
Melodia is Sonauto's model. Rather than discrete tokens it uses latent diffusion in a continuous space — the same class of tech behind Midjourney — which the founders say allows more fluid control and coherent long-form lyrics.
How long can songs be?
Up to about 4 minutes 45 seconds on the V3 Preview model in 2026; earlier models maxed around 2-3 minutes. You can also extend a track by 60-80 seconds or more.
Can I fix part of a song?
Yes — inpainting rewrites lyrics or sections with pinpoint accuracy in auto or manual modes, and you can edit individual sections, extend, export stems and remix.
Can I use songs commercially?
Sonauto's terms say you own what you generate, but many reviewers describe its commercial licensing as unclear versus Suno or Udio. For serious commercial or client work, confirm current terms carefully or use a tool with explicit licensing.
What are the main limitations?
Unclear commercial licensing, occasionally unnatural AI vocals, less precise control and advanced editing than paid tools, sometimes slow generation/editing, prompt-dependent results, and unresolved training-data ethics.
Do I need an account?
No — you can start creating immediately at the official site with no sign-up, then make an account to save, share or use community and remix features.
Your move

Unlimited songs, zero dollars

Type an idea and let diffusion do the rest — free, unlimited, no sign-up to start.

Make a song free → Developer API