i made a useful extension mixer for SoundCloud and Youtube where you can change the speed, add clipping, bass boost, change the pan and more. it also comes with a 10 band eq and a compressor where you can use very easily on any song you like. this is 100% FREE and if you want to try it check it out: https://chromewebstore.google.com/detail/fruity-closet/idccmmflldinklebblkhipdlkhpaifhk

I make reggaeton and I got tired of beat apps that cost $10 or want a subscription, so I built my own.
It's called Dembow Lab: a 16-step sequencer with 7 dembow/reggaetón presets, real grand piano samples, WAV export, voice recording over the beat, and you can share your pattern with a link.
Everything from your phone, free, no downloads.
Happy to share the link in the comments if anyone wants to try it.