Questions and answers

Yes. There is no account and no paid tier. The site is supported by ads on some pages, which you can decline.

No. The separation model runs on your own device, and your songs and stems are stored in your browser. If you paste a link, your browser fetches that audio file directly from the address you gave.

It separates a finished recording into four stems: drums, bass, vocals, and everything else (guitar, keys and other instruments together). You can then mute, solo, loop and slow down any combination.

The model, HTDemucs, outputs four stems. Guitar, piano, synths and other instruments all land in the "other" stem, which Stemroom labels "Guitar and keys".

Good enough to practise with, not perfect. You may hear faint traces of a muted part, especially cymbals, reverb and dense mixes. Clean, well-recorded songs separate best.

On an iPad Pro in fast mode, a three-minute song takes about a minute and a half. In compatible mode it takes several minutes. You can separate only a section of a song to save time.

Fast mode needs a browser with WebGPU and 16-bit shader support, such as recent Safari on iPadOS or iOS 26 or later, and about 8 GB of memory. Compatible mode needs any recent browser with WebAssembly, workers and AudioWorklet. Playing saved songs works in any recent browser.

Playing songs you have already separated works. Separating new songs on an iPhone is not reliable yet. We recommend splitting songs on an iPad or computer.

The separation model. It downloads the first time you separate a song and is then stored on your device, so it only happens once. Use Wi-Fi if you can.

After your first visit and model download, yes. You can open saved songs and separate new ones without a connection.

About 300 MB for the models, plus about 130 MB per saved three-minute song. The library page shows what you are using, and you can delete songs at any time.

No. Stemroom stretches time while keeping the pitch the same, from 100 percent down to 50 percent. At slower speeds a little graininess is normal.

No. Stemroom only accepts audio files, direct links to audio files, and Dropbox and Google Drive share links. Streaming services protect their audio, and we do not try to get around that.

Yes. The download button in the player exports the current mix as a WAV file, for example a backing track with the drums muted. Individual stems are not exported.

Use songs you own or have permission to use, for your own practice. You are responsible for the audio you add. See the terms.

Ads help pay for hosting and keep Stemroom free. They show only on the library, add-song, guide and FAQ pages, never in the player, and only after you allow them. You can change your choice with "Ad choices" in the footer. See privacy.

Start with the troubleshooting section of the guide. If that does not help, use the contact details on the About page.