Sonauto Review 2026: Renamed Treblo, Free, and Worth Knowing About

Sonauto was one of the more interesting small AI music generators of 2024: a Y Combinator company with its own model and a reputation for giving away more than its rivals. In June 2026 it changed its name to Treblo. If you search for Sonauto today, that is where you land.

This review covers what the product is now: what is free, what the model can do, who owns the songs, what users complain about, and how it compares with the paid Suno alternative we rank first. Everything was checked against Treblo's site, terms, documentation and app listings on 29 October 2026.

Sonauto is now Treblo: what changed

The rename was announced on Treblo's blog on 3 June 2026. The reason was plain: people "couldn't pronounce it" and kept mistyping the address. The post says the same four people are running it and "everything in your library is where you left it".

In practice, very little changed for users:

• The website moved from sonauto.ai to treblo.com, and old links redirect.
• The company behind it is still Sonauto, Inc. in San Francisco, according to the terms of service dated 22 September 2026.
• The apps now carry the Treblo name, published by Sonauto, Inc. on iOS and Android.
• The developer API moved to api.treblo.com; the old host "still resolves for now".

One loose end is worth knowing about: sonauto.ai/pricing now redirects to a Treblo page that returns a 404. If you hit a dead end looking for prices, it is not you. There is no consumer pricing page because there is nothing to buy.

Treblo's homepage, captured 29 October 2026. sonauto.ai now lands here.

Sonauto at a glance

What "free" means here

Most AI music generators advertise a free tier and then ration it. Treblo's homepage says "$0.00 Truly free. Unlimited songs with our latest model", and its FAQ adds "No credits, no daily limits."

It backs that up with a comparison table, dated 25 September 2026, of what each service's free tier gives you: unlimited songs on Treblo, five a day on Suno, four a day on Mureka and one a month on FreeMusic.ai. That table is Treblo's marketing, but the figures describe its rivals' published free tiers, and its own claim is easy to check by signing up.

Downloads are free too. Treblo lists "All formats (OGG, MP3, WAV, FLAC, M4A)" for free users. That is a real difference from Suno, whose free plan includes no monthly song downloads.

The iOS app, "Treblo - AI Music", is free and lists no in-app purchases. The terms do contain a generic clause about auto-renewing subscriptions, but we found no consumer subscription anywhere on the site or in either app. It most likely covers the developer plans below.

What Treblo can do

The feature list is longer than you would expect from a free product:

• Generation from a prompt or lyrics. Bring finished lyrics, sketch a hook, or ask Treblo to write them, with structure tags for verses and choruses. There is an instrumental mode.
• Inpainting. Regenerate one section, swap a line of lyrics or redo a part you do not like, without starting over.
• Extending. Add more song to a generation you want to keep.
• Stem separation. Split a song into parts, on the free tier.
• Covers and remixes. Restyle a song in a new genre. Covers from your own uploaded audio are in "limited early access" in iOS version 1.6.0.
• Styles and languages. The homepage claims 4,160 style tags. Treblo sings in Latin-alphabet languages and also Japanese, Korean, Chinese, Arabic, Russian and Hindi, though it warns "the pronunciation may be off".
• Speed. Songs start streaming in about 15 seconds, according to the FAQ.
• Sharing. You can publish to a profile, groups and playlists, or keep songs private and download them without publishing.

The model and song length

The homepage names the current model Melodia v3. The app labels it "v3-Preview" and warns that it "may sometimes produce lower quality results". That is an unusually candid note, and it matches some user reviews.

Song length depends on where you look: the app says full-length songs run up to 4.5 minutes, while the API documentation caps a generation at 4 minutes 45 seconds and says songs typically run two to four minutes. Treblo's detector page also mentions "a new Treblo model" released on 22 September 2026, which we could not match to a named release.

Who owns Sonauto songs

Section 8 of the terms is generous on the surface and careful underneath.

You get the rights that exist. "You own any right, title, or interest that may exist in the musical and/or audio content that You generate," and the company assigns you its own rights, "if any".

Commercial use is not restricted. The terms say the commercial-use restrictions elsewhere "do not limit Your use of Your Outputs", and the FAQ says this applies "even on the free tier".

Your work trains the model. You grant the company a licence to use your outputs, "and the prompts, lyrics, and other content You submit", to improve its AI models. If you write original lyrics, that is the clause to weigh.

Outputs may not be unique. The same or similar output can be generated for different users.

No copyright promise. The company makes "no warranties or representations regarding the Outputs, including as to their copyrightability". Rights that "may exist" in AI-generated music are a live legal question, as our guide to Suno's commercial-use rules explains for the market leader.

Watermarks, detection and the Billboard claim

We found no watermark statement anywhere in Treblo's terms, API documentation or blog. The company has taken a different route to provenance: on 3 August 2026 it released an open-source classifier that detects songs made with Treblo. Treblo says it has "a false positive rate below 1 in 10,000" but "only covers our own models", and its detection page admits the classifier has not been updated for the 22 September model.

That classifier is behind Treblo's most eye-catching claim. The homepage says "The first AI-generated song on the Billboard Hot 100 was made with Treblo." The song is Fenix Flexin's "Rubberz", which Rolling Stone Canada reported reached No. 58. Treblo's classifier rated the track as very likely Treblo output, and co-founder Ryan Tremblay told Stereogum that someone "appears to have used our model". That identification comes from Treblo's own tool, which has not been independently verified.

Deezer, which tags AI music on its own service, names Suno, Udio and Riffusion among the generators it detects. It has not said whether it detects Treblo.

What users praise and complain about

User feedback is thin but consistent:

• App ratings are high. The iOS app averages 4.7 from 389 ratings, and the Android app 4.6 from about 1,740 reviews with over 100,000 downloads.
• Trustpilot is too small to judge. The Sonauto profile shows 3.6 from five reviews. There is no Treblo profile yet.
• The praise is for being free, unlimited and ad-free, and for the depth of the editing controls.
• The complaints cluster around new restrictions since about September 2026: artist names blocked in prompts and uploads rejected for matching existing audio. Others mention vocals changing when a section is regenerated, gibberish after the lyrics end and lyrics not followed closely.

Those restrictions are user reports; we found no Treblo announcement describing them. They do fit a wider pattern in the market, which we cover in our explainer on why Suno rejects covers that match existing recordings.

Developer API pricing

The only paid plans Treblo lists are for developers. Some directories present them as app subscriptions; they are not.

Treblo's API pricing, captured 29 October 2026.

One song costs 100 credits, plan credits reset each month, and apps built on the API must display a "Powered By Treblo" attribution.

Sonauto vs WaveQuake: which Suno alternative?

Treblo is the best free option we have reviewed. It is not our top pick for someone replacing a paid Suno plan, and the reasons are specific.

The training clause is the sharpest difference. WaveQuake's terms say its permission to handle your content does not authorise it to "use it to train generative models", and that any training programme needs a separate opt-in.

WaveQuake also sells a complete studio rather than a generator. Its twelve tools are Songwriter, Soundprint, Prompt Lab, music creation with two versions per generation, cover versions, artist voices, your own AI artist, voice memos, sheet music with ABC editing and PDF export, mastering, Custom Effects and saved ideas and briefs. Since late October its $149.99 purchase includes unlimited standard generations, so the old argument that a free tool is cheaper per song no longer separates them.

Source: WaveQuake pricing page, captured 4 November 2026. Unlimited Standard Generations and Unlimited Downloads are included.

Where Treblo wins is instrumentals and stems, both of which WaveQuake lacks, and of course the price. Our WaveQuake review and our ranking of the best Suno alternatives cover the paid option in full.

Our verdict

Sonauto, now Treblo, is the most generous free AI music generator we have looked at: unlimited songs on its latest model, every common download format, stems and section editing, at no cost and with no credit system. For sketching, demos and learning what AI generation can do, start here.

For music you intend to release, read section 8 first. Your outputs, prompts and lyrics train its models, the rights it assigns are only the ones that may exist, and the model is still labelled a preview. If you want a finished, mastered vocal release with songwriting tools and a licence that keeps your work out of training, WaveQuake remains our No. 1 Suno alternative.