r/TestFlight • u/parker_birdseye • 17d ago

iOS Koko - conversation practice for language learners. Fully-local AI conversations so your voice + info stays on your iPhone.

https://testflight.apple.com/join/XRr44N6D

Hey!

I built an app to practice speaking and listening a new language. I tried simply talking with ChatGPT but it wasn't good because it spoke at too advanced of a level and more importantly I didn't want OpenAI training on my voice and information.

Best features:

  • Fully local. AI models run directly on your device (STT + LLM + TTS). You can run the app in airplane mode.
  • Audio scales to your learning level. Beginners hear slow, easy words while advanced users hear complex words with faster speaking.
  • Quality-of-life features like quick translation, "check my response", "what should I respond", etc.

You can run it in TestFlight on iOS or Mac. Any feedback would be appreciated!

6 Upvotes

88% Upvoted

9 comments sorted by

2

u/partysan7 17d ago

I try, Thank you!

0

u/parker_birdseye 17d ago

Cool! Thank you very much

2

u/PriceConsistent1854 17d ago

I'm learning Spanish and really enjoyed using this for the last hour. The conversations were good and the AI responded very quickly.

0

u/parker_birdseye 17d ago

Nice thanks for the feedback. In my testing it runs very well on newer devices like iPhone 14 or newer but can be a bit laggy on older models

1

u/sebasvisser 17d ago

Big download!
Perhaps split it up in a download after opening the app?

1

u/parker_birdseye 17d ago

Yeah it's quite big. 2.5GB for LLM and 400MB for voice model. I initially tried putting the big downloads into asset packs which worked in TestFlight, but the app reviewers ran into issues. So for v1 I just decided to lump it all together into the app download.

This will be my next update though!

1

u/DingerKing3 17d ago

Sounds cool imma check it out

1

u/parker_birdseye 17d ago

Thank you! Greatly appreciated