Is the Moises app worth it for musicians, and what does its AI really do?

A bass player has a gig on Saturday and a song he has never played. The bass line is in there somewhere, under a kick drum and a wall of keyboards, and every time he loops the bridge on his phone he hears the keys, not the bass. He drops the file into Moises, mutes everything except the bass, slows it to 80% and plays along until the bridge stops being a guess. That is the app at its best, and it is the scene the whole product is built around.

Now the other scene. Someone types "moises app" into a search bar because they heard it is an AI music app and they want to make a song. They install it, upload nothing because they have nothing to upload, and stare at a screen that wants a file. Moises is not broken. It was built for the first person.

This page is for anyone deciding whether to pay for Moises. It goes feature by feature through what the AI does, what the free plan really lets you test, what the paid plans add at the time of writing, where the AI is estimating rather than knowing, and who should spend the money elsewhere. If you are comparing separation engines across several tools (Demucs, LALAL.AI, built-in DAW splitting and the rest), the stem splitter comparison is the page for you. This one is for the reader who has already narrowed it down to Moises and wants to know whether the subscription earns its keep.

One note before we start: sunomarket is an independent site. It is not affiliated with Moises, with Suno or with any other company named here, and every fact about Moises below comes from Moises' own site, help centre and App Store listing.

What the AI actually does, feature by feature

Moises started as a stem separator and grew a practice toolkit around it. Almost every feature works on a song you already have: you upload audio, the AI analyses it, and you get controls over the result. The table below lists the main tools with the free-plan limits Moises' help centre gives at the time of writing.

Then there is a second tier of tools that live mainly in the web and desktop apps:

• AI Mastering. Moises' feature page describes an automatic mode, an advanced mode and a reference-track mode (the first two need Pro), with loudness presets for platforms such as Spotify and YouTube. You can try mastering for free, but exporting a master for distribution needs Pro, and the feature runs only in the web and desktop apps, not on the phone.
• Voice Studio. This is voice conversion, not a singer. You upload a vocal you recorded, and the tool re-voices it in the timbre of one of Moises' AI voice models while keeping your melody and phrasing. Moises' help centre says Free users can try it, Premium users can process files, and exporting the result needs Pro.
• AI Studio. Announced by Moises on 20 August 2025 as a simplified studio and a first step toward a web-based DAW, it generates instrument parts, such as a bassline or a drum track, that fit a recording you already made. The announcement says Moises focused on that instead of training models that output entire songs.
• Lyric Writer. The web app lists a tool by this name, and the help centre describes it in a single line as an AI tool that helps with your writing. We could not find a detailed description of what it produces on Moises' own pages, so we are not going to guess.

Notice the pattern. Every major feature either analyses audio you supply or transforms audio you supply. The generative part (AI Studio) adds instruments around your recording. Nothing in the Moises line-up, on the company's own description, takes a sentence like "a sad song about leaving home" and returns a finished song with words and a voice. That is not a flaw. It is the product's shape, and it decides who should pay for it.

What the free plan lets you test, and the walls you will hit

The free plan is generous enough to judge the separation and stingy enough to make the practice tools feel like a preview. Here is what that means in practice.

Five uploads a month, and deleting does not give them back. Moises' help centre is specific: the free plan allows 5 files per month, the counter resets at the start of each calendar month, and deleting a song afterwards does not free its slot. So do not burn uploads on test files. Pick the five songs you would actually practise this month.

Five minutes per file for separation. Most pop songs fit. A long live recording or a prog epic will not. The help centre's own workaround is to cut the audio into segments under the limit and upload each one, which costs you uploads from that same budget of five.

The first minute rule. Chords, the Smart Metronome and lyric transcription all stop after the first minute on the free plan. This is the wall most people hit. You can see that chord detection works and whether its voicings match what you hear, but you cannot learn a whole song with it.

Small moves only on tempo and key. Free users can change speed by up to 20% and pitch by up to 2 semitones. For a singer who needs a song a whole tone lower, 2 semitones is exactly enough. For a guitarist learning a fast solo, slowing it by a fifth often is not.

A fair way to test before paying: upload one song you know very well and one you are learning. On the familiar one, check whether the chords in the first minute match what you play. On the new one, separate it and listen to the instrument you care about. If the separation is clean enough for your ears and the chords are right on a song you know, the paid plan is mostly about removing the one-minute ceiling.

What the paid plans cost at the time of writing

Moises' public pricing table sits behind a login, so the cleanest public numbers are the in-app purchases on the US App Store listing. At the time of writing, that listing shows Moises Premium at $5.99 a month or $39.99 a year, and Moises Pro at $29.99 a month. Prices can differ between the web, Android and other countries, and subscription prices change, so check the billing page inside the app before you pay.

What the two tiers buy, in Moises' own description:

• Premium removes the monthly upload cap, raises the file limit to 20 minutes, adds the extra stem types, gives priority processing and opens the practice tools for the whole song. For a player who practises along to recordings, this is the plan the app is really sold as.
• Pro adds higher-fidelity separation models, extra stem modules, a much longer per-upload limit on the App Store listing, exporting from Voice Studio and exporting masters. It is aimed at people producing and releasing music, and at about five times the monthly price of Premium it should only be bought for a specific Pro feature you have already tried.

One more thing to read before treating "unlimited" literally. Moises publishes a fair usage policy saying the plans are for normal personal use. As a guideline, it treats regularly processing 14 or more tracks a day, or 420 a month, as abnormal, and it rules out bulk-generating stems to sell as loops or sample packs. For a musician learning songs, that ceiling is far away. For someone planning to run a stems service on one account, it is the end of the plan.

Where the AI is estimating, not knowing

Every feature on that table is a model making a judgment about audio, and judgments can be wrong. You do not need to hear the output to know where the risk sits, because the risk follows from what each task asks the model to infer.

Separation is a reconstruction. A mixed song is one stereo file where everything has already been added together. The separator rebuilds each part from what it learned instruments sound like. When two instruments share the same frequencies (a distorted guitar and a synth pad, say) the model has to decide which sound belongs where, and that is where bleed and watery artefacts come from. This is true of every separator, not only Moises, and it is why the stem splitter comparison is about which model sits underneath.

Tempo is an estimate of an estimate. Moises' help centre explains that the BPM figure comes from the Smart Metronome detecting beats and then calculating a number from the time between them. The help centre even has an article titled "The BPM is wrong, what should I do". A song with a rubato intro, a tempo change or a live drummer drifting is exactly where you should check the number against your own ears.

Chords are a simplification by design. The easy, medium and advanced views exist because a detected chord is a reading of the harmony, not the harmony itself. Dense jazz voicings, a bass note that moves under a held chord, or a riff that implies a chord without playing it are the places to trust the grid less.

Transcription covers five languages. The App Store listing names English, Spanish, Portuguese, French and Italian. If you sing in another language, assume the lyric view will not help.

None of this is a reason to skip the app. It is a reason to use it the way a session player uses a chart: as a fast first draft you correct by ear.

Who Moises fits, and who should spend the money elsewhere

Whether Moises is worth it depends on what you are trying to do. Here is the split by job.

A player learning songs by ear. Guitarists, bassists, drummers and keys players who learn from recordings are the reason this app exists. Separation plus slow-down plus chords plus a click is the whole practice loop in one place. If you practise along to recordings several times a week, Premium is the plan to look at.

A singer who needs songs in their key. Key detection and pitch shifting are made for this. The free plan's 2-semitone limit may already cover you; if you regularly need bigger moves, that is a Premium reason.

A cover band, worship team or school ensemble. Setlists, separated parts per player and the same account across phone, desktop and the web app suit a group that rehearses from recordings.

A producer chasing the cleanest possible stems. Moises is one option among several here. Compare it against the alternatives before committing, because separation quality is the only thing that matters for this job.

Someone building a mashup. Moises can split both songs and give you key and tempo, which covers the mechanical half. Choosing two songs that can share a room is the musical half, and the AI mashup guide covers it.

Someone who only needs the key of one song. You may not need an app at all. Finding the key of a song in three steps works with your ears and an instrument, and the free plan covers the occasional check.

Someone who wants to make a new song from nothing. Moises is the wrong first tool. Its features start from audio you already have. If your goal is a song with words and a voice, you need something that writes and something that sings, and Moises is useful later in that chain, not at the start.

Rights: what separation does and does not change

Pulling a vocal out of a commercial record does not give you any new rights in it. The file is easier to use, not more yours. Practising along to a separated track for yourself is one thing; publishing an isolated vocal, releasing a remix of someone else's master or selling stems taken from it is another, and the separation step changes nothing about that.

Moises also sets its own terms on top. Its help centre says the Voice Studio voice models are royalty-free for uses such as production, advertising, social media and live performance, but that reselling the voice model or any of its generated output in isolation is prohibited. Rules differ between countries and between platforms, and this is not legal advice. For the wider picture on AI-generated music and ownership, see who owns AI-generated music and our disclaimer.

If you came to Moises to make your own song

Here is the chain that actually produces a new song, and where each tool sits in it:

1. Words. A lyric with a title, verses and a chorus.
2. Sound. A style prompt describing genre, instruments, vocal and mood.
3. Audio. A music generator, most often Suno, turns the lyric and the prompt into a track.
4. After the track exists. Now Moises becomes useful: split your generated track into stems, find its chords and key so you can play it live, or slow it down to learn your own song.

Moises lives at step 4. Step 1 is where sunomarket's AI song generator fits. You fill in a short brief and it returns a title and a full lyric with section tags, ready to paste into Suno's Lyrics field. It does not sing and never produces audio; the audio is a separate step in Suno, which is a different company we do not resell or speak for. Here is what a brief and the start of the result look like:

Brief
  theme      a bass player who learns every song the night before the gig
  language   en
  POV        first
  structure  classic
  hook       title-line
  vocal      male
  emotion    confidence

Result (opening, illustrative)
  Title: Night Before the Gig

  [Verse]
  Kitchen light and a borrowed cable
  Headphones on at a quarter to two
  I loop the bridge on the folding table
  Till the hard part sounds like something I knew

  [Chorus]
  Night before the gig, I learn it all again
  Night before the gig, the low end is my friend

One generation on the SM1 model costs 20 credits, which is $0.20 at 100 credits to the dollar; SM2 and SM3 add an editing pass that flags weak lines and rewrites them, at 80 credits ($0.80). There is no free trial of the lyric generator: new accounts start at 0 credits, and plans start at $5 a month for 500 credits, with a $19 one-time option of 1500 credits that never expire. The details are on the pricing page.

For step 2, a reference song you analysed in Moises is a good starting point, with one caution. Suno tends to ignore a numeric BPM, so describe tempo in words rather than pasting the number Moises gave you; the tempo guide explains how. The style catalogue has ready recipes for nearly 2 000 styles if you would rather start from a tested prompt.

And once Suno has given you a track, Moises earns its place again: separate the generated song, check its chords, and learn to play the thing you made.

The move to make this week

Take the two songs you most need to learn this month and upload them to Moises on the free plan. Separate them, slow them down, and check the first minute of chords against what you hear. If the one-minute wall stops you twice in that week, Premium is a practice expense that pays for itself. If you realise what you actually wanted was a song of your own, skip the upload and start with the words at the song generator, then bring the finished track back to Moises to learn it.