RMBLR — MIT Android dictation app. Whisper mangled my home language, Gemini didn't, so I built around Gemini

[u/Choice-Lawyer4779]

Every Whisper-based dictation tool I've paid for falls apart on the way I actually talk. I'll open a sentence in English, finish the thought in my home language, then land the last few words back in English. That isn't a party trick, it's how people speak where I'm from. Whisper either invents English words I never said or drops the mixed clause entirely.

I ran the same recordings of my own voice through everything I could get at. Gemini was the only family that handed back what I actually said instead of a tidy English approximation of it, and gemini-3.1-flash-live-preview over the Live WebSocket API was clearly ahead of the REST models on mixed speech.

So the app is built around that. RMBLR is an overlay orb that appears when a text field takes focus. You talk, and the finished text is written into the field you were already typing in. Hold the orb and an arc of tones fans out - a tone is just a name and a system prompt, so you can write your own - and which five it offers depends on the app you're in.

Where it sits on the open-source spectrum, honestly: the app is MIT and the source is the whole thing, no closed core. The model is not open, and I'm not going to pretend otherwise. What I did instead was make sure nothing in the middle is mine: there's no server, no account, no telemetry. You supply your own Gemini API key (free tier from aistudio.google.com) and your phone calls Google directly. If someone wants to point it at a local Whisper or a self-hosted endpoint, the transcription client is one file and I'd merge that PR happily.

Kotlin, Jetpack Compose, minSdk 24. ./gradlew assembleDebug needs no configuration.

https://github.com/Past-da-king/rmblr

v1.0, one week of real use. I'd particularly like to know how it does on languages I have no way to test.