I just launched spedup.app – a simple way to remix music (Slowed, Speedup, Reverb) in your browser

Hey Indie Hackers 👋

I recently launched https://spedup.app, a web app that lets anyone edit music into the “slowed + reverb” or “speedup” style — in just a few clicks, with no software or technical knowledge needed.

🎧 Why I built it:

I’m a fan of the slowed/speedup/reverb trend on YouTube and TikTok, but I found it surprisingly hard to recreate the effect myself. Most tools are either too complex (DAWs), too expensive, or just not fun to use.
So I built what I wanted: a fast, intuitive audio tool focused only on the vibe.

⚡ What it does:

• Upload any audio file

• Instantly tweak the speed or add reverb

• Listen in real-time

• Export your remix as a .wav file
  All in the browser — no signup (except for export), no install .

🧪 Tech:

• Web Audio API

• Vanilla JS + Wavesurfer.js

💸 Business model:

• Free plan with 3 exports/month

• Paid plan: €3.99/month for unlimited exports

🔗 Try it: spedup.app

I'd love your feedback! And if you make something cool with it, send it my way — I’m always happy to hear what people create 🎶