Explain it out loud
Tell the duck what your code is supposed to do — by voice or by tapping. Saying it out loud is how you find the answer.
Free Developer Tool
Stuck on a bug? Tell it to the duck.
Quack is a cute, private, fully-offline rubber duck that listens while you explain your problem and asks the right questions until you spot the answer yourself. The famous rubber-duck-debugging trick, now in your pocket.
Talk it out. Find the bug.
The duck asks questions
What did you expect? What actually happened? What did you change last? What are you assuming? The right questions surface the bug.
You spot it yourself
No AI writes your code. No answers handed to you. Just the clarity that comes from explaining a problem step by step.
100% private & offline
No account, no sign-up, no internet required. Everything stays on your device. The duck never phones home.
Make it yours
Prompt packs
Beyond debugging: Senior Engineer mode, Interview Prep, Writer's Block, Decision Maker, Study Buddy and a gentle Talk-It-Out pack. Same duck, new questions.
Duck skins
Dress your duck — pirate, wizard, dev-hoodie, detective, astronaut and more.
Save your sessions
Keep notes from the bugs you solved — searchable, private, on-device.
Free, with no subscription
Free with ads. One-time purchases remove ads and unlock packs & skins. No subscriptions, ever.
Honest heads-up: Quack asks questions — it doesn't write your code or analyse it for you. That's the whole point of rubber-duck debugging, and it's why it works.