Moises: The Musician's AI App

Review by eFreeware

Learning a song usually means fighting the recording. The guitar part you want to hear sits under the vocals, the tempo drifts from what your metronome is doing, and the key is wrong for your voice. Moises is built to take a finished track apart so you can work on one piece of it at a time, and it comes from Moises Systems.

The idea is simple: feed it a song, and it splits vocals from instruments while also working out the beat and chords. From there you can mute tracks, change volume, shift the key, slow a passage down or pull out a backing track. It's free to download, has no ads, and offers in-app purchases, with the developer describing it as the leading vocal remover for musicians.

That combination is why the app has drawn a large audience. It has more than 50 million installs and a 4.5 average from over 434,000 ratings, and it first appeared in November 2020. The question for anyone considering it is less whether it works than how much of it you get without paying, and that is where the plan structure matters.

Taking a song apart into stems

Separation is the core of the app. The developer says it can pull vocals, drums, guitar, bass, piano, strings and other instruments out of any song, which makes it useful for building a practice backing track, an acapella version or a karaoke track. You can mute or solo individual parts, adjust their volume and reshape the mix rather than accepting the original balance.

The free plan covers vocals, drums and bass separation along with the chord detector, metronome click track, pitch shifting, BPM detection and setlists. That is a genuinely usable starting point for a guitarist who mainly wants the vocal out of the way. The Premium plan opens up unlimited separation and finer instrument splits, including lead and rhythm guitar, acoustic and electric guitar, and main and background vocals. Pro adds Hi-Fi separation models, drum-part and multimedia audio stems, uploads up to 180 minutes long, Voice Studio and VST plugins.

For anyone scoring a whole set or working with long recordings, the upload ceiling on the lower plans is the detail to check before committing. The app is free to download and there are no ads, but the in-app purchases are what move you past the free tier's three-stem limit and into the advanced separation models.

Chords, keys and a metronome that follows the song

The practice tools are the second half of the pitch. Chord detection produces guitar tabs and chords synced to the track, with settings pitched at beginner, intermediate and advanced players. Key detection identifies the song's key and can transpose the chords into any of the 12 keys, so a piece written in an awkward key becomes playable without retuning or rewriting anything.

The speed and pitch changers handle the other common obstacles. You can slow a hard section down or speed it up with a single action, and the BPM detector displays the tempo. A smart metronome generates a click track that stays in sync with the beat of the song, and a count-in period can be set before playback so a band can start together on the beat.

Lyric transcription turns music into text in English, Spanish, Portuguese, French and Italian. That is a narrow set of languages, and it is worth treating the output as a draft to check rather than a finished lyric sheet. Looping and trimming round out the practice side: the app detects song parts so you can repeat a section without hunting for the boundaries yourself.

Sharing work and moving files in and out

Collaborative setlists let you invite other people, adjust song elements together and keep the work in one place. For a teacher preparing material for students, or a band splitting arrangement duties, that is a more useful shape than a folder of exported files. Exports cover high-quality mixes and separated stems, including the metronome click track, and stems can be taken into another track maker.

Importing is flexible. You can bring in audio from Google Drive, Dropbox, iCloud or a public URL, and add songs from iTunes or audio files passed along by other apps. Audio extraction is available in MP3, M4A or WAV, with the WAV option noted as desktop only, so anyone expecting lossless exports straight from a phone should plan around that.

The developer also lists advanced features as available on the web, which suggests the browser side is where the heavier work is expected to happen. Between the import routes and the export formats, the app is designed to sit in the middle of an existing workflow rather than replace it.

What setup actually involves

Getting going is described as three steps: upload an audio or video file, let the separation and detection run, then modify the stems, control volume and mute tracks before downloading separated stems or a custom remix. Import options mean you are not limited to files already stored on the device.

The practical requirements are modest but real. You need a source file, whether that comes from cloud storage, a public URL, iTunes or another app. The plan you choose determines how much separation you can do and which instruments can be isolated. The app was last updated in October 2026, so the toolset reflects a project that is still being worked on.

Because the free tier covers only vocals, drums and bass, someone whose interest is piano or strings will be looking at a paid plan from the outset. That is not a flaw in the design so much as the boundary of the free offering, and it is the first thing to weigh against what you actually play.

Who gets the most from it

The clearest fit is a player who learns by ear. If you play guitar, bass, drums or piano and want the recorded part isolated, slowed down and shown as chords, the combination of separation, chord detection and tempo control maps directly onto how you practice. Singers and cover bands get a similar benefit from pitch shifting and backing tracks, and karaoke and acapella singers can strip a track down to what they need.

Teachers and students are another natural pair. A teacher can prepare a version of a song with one part removed, share it through a setlist, and let the student play along with the rest of the arrangement. Social media creators and sound editors sit at the other end, using the same separation and export tools for remixes and content rather than practice.

The app is less obviously suited to someone who wants to listen to music with the vocals reduced and nothing else. Everything here is organized around working with the parts: adjusting, looping, transposing and exporting them. If you never intend to touch a stem, the practice tools will go unused.

A practice companion worth the download

Moises earns a recommendation for anyone who wants to take songs apart and work on them. The free download covers enough to be useful for guitarists and bassists, and the paid tiers extend that into finer instrument separation, longer uploads and professional-grade models for people who need them.

The limits to keep in mind are the free plan's three stems, the five languages for lyric transcription, and WAV extraction being desktop only. None of these undercut the core function, but they shape which plan makes sense. Check the instrument split you need before deciding whether free is enough.

It is best thought of as a tool for players, singers, teachers and editors who want the parts of a recording in their hands. For that audience, the combination of separation, chord and key detection, a synced metronome and flexible export is a coherent package rather than a collection of unrelated features.