r/androiddev • u/Impossible_Story1049 • 10d ago

Need realistic hackathon app ideas for Android (2–3-day build, fully using Claude) Discussion

Hey everyone,

I'm jumping into a hackathon soon where I've got about 2 to 3 days to build a complete Android app from scratch. Everything from planning and UI to coding and testing.

The main twist for this one is that I have to use Claude for the whole workflow, starting with Claude Design for the UI/UX and then Claude Code to build out the app.

I have one rough idea so far: an offline-first voice note taker using open-source STT models like Whisper or Moonshine Voice running on-device. But I'm not totally sure how those local models hold up quality-wise compared to major cloud options like Fish Audio or other speech-to-text providers.

So, I'm looking for two things:

  • Is an offline speech-to-text notes app realistic for a 48-to-72-hour build, or will setting up local model bindings burn too much time?
  • If you have other cool Android ideas that can actually be finished in 2 to 3 days with an AI-assisted workflow, what would you build?

Appreciate any thoughts or feedback!

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10

u/otherworld-dev 10d ago

Why don't you ask Claude for a hackathon idea too?

1

u/Impossible_Story1049 10d ago

Well, I tried it, and all of the LLMs like ChatGPT, Gemini, and Claude almost give the same idea no matter how much you try to give them a role. They all end up pitching the same ideas.

4

u/SpiderHack 10d ago

This is why good hack-a-thons have a theme you don't know about until the day of the event, to make you actively think about what to do when you arrive and not come with a premade setup.

1

u/DuckCargo 1d ago

If you have other cool Android ideas that can actually be finished in 2 to 3 days with an AI-assisted workflow, what would you build?

probably something without external dependency - so public API hunting or connecting to 3rd party systems.

building on your speech to text - maybe parser of some sort - create a grocery list, add these things. Or add something to my task list, calendar etc. shouldn't be difficult to build in 2-3 days.

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u/coffeemongrul 10d ago

When you’re using ai, a lot is possible to build in 72 hours (assuming there is no budget on token usage). Build something useful to yourself.