The Rap App
Every Rapper Wished Existed.
Every rapper has been there. Bars in Notes. A rhyme in your head. A take about to start. One swipe, and the line is gone.
Luke Mounthill
Founder, Producer
A Note From the Founder
The day it hit me, I was running a session.
I produce beats as Luke Mounthill Beats. So I'm in the booth with rappers a lot.
The rapper had his bars in three different Notes apps. He kept swiping between them. He kept losing his place. He had real talent. He had real bars. But the app was fighting him. We spent half the session hunting for a line he had written the night before.
"It wasn't the rapper. It was the page. The page didn't know it was holding rap."
That's the part nobody fixes. Every writing app treats your verse like a grocery list. Notes. Word docs. ChatGPT. None of them know how a rap line works. None of them know if your words fit the beat.
So I built the app I wanted in every session. RhymeFlux thinks like a rapper. It catches the rhymes you missed. It counts how your words fit the beat. It saves every word the second you type. A dead battery never costs you a hit again.
RhymeFlux exists so no rapper ever loses a bar again.
Three Rules. Every Time.
If a new feature breaks one of these, it doesn't ship. Simple as that.
Your bars are yours.
We don't read what you write. We don't sell it. We don't train any AI on your bars. Your songs stay in your private account. That's it.
Write anywhere, anytime.
Studio, basement, plane, train. RhymeFlux opens in any browser, on any device. Nothing to install. Pro users keep writing for 7 days with zero internet.
AI helps. You write.
The AI gives you ideas. It never finishes the song for you. Every word stays your call. You're still the writer. The AI is just a friend who knows the rules.
Built for rap.
Not for everyone else.
Most writing apps were built by people who don't rap. You can feel it the second you try one. Here's what we will never do.
No AI that writes the song for you.
The AI gives you a few options when you ask. You pick. You write the song.
No training AI on your bars.
Your bars never train any AI, and we never sell them. When you ask the Co-Writer for a line, they're sent off to write that one suggestion, then dropped. Never stored, never reused. Your unreleased verses stay yours. Always.
No paywall on the first line.
The free plan lets you write a full song. The Pro tools light up on the first 12 bars of your first section so you can see what they do. After that they step back. Upgrade only if you want them on for the rest.
No lost lines. Ever.
Every word saves to your device the second you type. Phone dies, browser crashes, the bars are still there.
No "for writers in general."
RhymeFlux only knows rap. It rhymes the way rappers actually rhyme. It writes in your vibe. Trap, Drill, Lyrical, or Melodic. It's not a writing app pretending to know rap. It's a rap app that happens to write.
Four Tools. Four Real Problems.
Each one started as a moment I watched go wrong in the booth. The full feature breakdown is on the features page.
For the rapper who missed his own rhyme
The rhyme catcher.
It paints every rhyme in your line in a color. Even the ones already inside your bar that you'd never notice on your own.
For the verse that fell apart on the last beat
The beat counter.
It tells you when a line has too many words to land on the beat. Before you walk into the booth and waste a take.
For the bar that just needed one more word
The co-writer.
Stuck on a line? Tap once. The AI gives you a few options in your style. You keep the one that hits. You move on.
For the hook that died with a phone battery
The safety net.
Every word saves to your device the second you type it. Phone dies, browser crashes, you're still good. The bars are still there.
Open the Studio.
Write Your Best Verse.
Free plan. No card. No setup. The studio is open right now.
Start Writing FreeNo credit card. 15 free AI Credits every 30 days. Cancel anytime.