I built a free AI stem splitter that runs entirely in your browser from my iPhone

I am Geral Pink, an independent developer from Puerto Rico. I recently launched a free AI music studio called Music Remix Studio that you can use entirely from your iPhone in your browser. No downloads, no sign-up, and no uploads of your audio to a server - all of the processing happens right on your device.

The app lets you upload a track or use one of the built-in demos. It then uses AI to split the audio into separate stems, which you can EQ and remix using AI text commands. When you're done, you can export the final result as a WAV file. The whole process completes completely offline on your own phone.

What makes this app special is that it runs the AI music separation model directly in the browser using ONNX Runtime Web, eliminating any server round-trip. This means your audio never leaves your device at any point.

I built the app as a single-page web app with an EQ and AI remix features. It includes 3 demo tracks in Hip-Hop, EDM and Chill styles, plus bilingual English/Spanish support. The entire site is a static Netlify deployment with no server costs.

To build it on my iPhone, I wrote and edited the code in the browser, tested it directly on the device, and then uploaded a ZIP file for deployment. The constraint of building from a phone forced good decisions like keeping it lightweight and offline-first. The hardest part turned out to be video editing for the demo.

You can try it out for yourself at https://musicremixstudio.netlify.app/. If you run into any issues, please let me know so I can improve the app. I'm excited to hear what you think of this free AI music studio.