Explain it to the duck.
Ship it to prod.
Quackstack is the AI rubber duck for engineering teams. Talk through your bug — the duck listens, asks the right questions, and occasionally tells you to read the docs.
No credit card · 100 free quacks/mo · SOC 2 Type II
$ qs quack "why does my useEffect run twice?"
🦆 Quackstack analyzing 12 files...
duck: Are you in React StrictMode? That's the most common cause.
duck: Also — your dependency array includes an inline object. Each render = new reference.
$ ▍
Trusted by engineers at companies you've heard of
9.2B
bugs heard
300ms
avg quack latency
47%
fewer stack overflow tabs
12k
ducks deployed
Features
A debugging partner that never gets tired of your bugs
Built for engineers who think out loud — and the teams that ship faster because of it.
Conversational debugging
Paste a stack trace. Talk through it. The duck listens, prods, and quacks back.
Trained on 9B+ bugs
Our flock has heard it all — race conditions, off-by-ones, and that one CORS thing.
Git-native
Open a quack from any diff. We follow your branch and remember context across PRs.
CLI-first
qs quack 'why is this useEffect firing twice' — answers in <300ms.
Zero data retention
Code never leaves your tenant. Quacks are ephemeral by default.
Quack streaming
Tokens stream. Insights compound. Your rubber duck has a brain stem.
How it works
Three steps to fewer bugs
Install
npm i -g @quackstack/cli — and you're holding a duck.
Explain
Talk through the bug in plain English. Paste logs, traces, code.
Ship
The duck asks the question that unblocks you. You commit.
"I finally understand why my reducer was infinite-looping. The duck just... asked."
Priya N.
Staff Engineer, Hexcorp
"Replaced our async-only Slack debug channel. The duck doesn't sleep."
Marcus T.
CTO, Bytemill
"I bought 4 plush ducks before this. This one talks back. 10/10."
Sasha L.
Senior SWE, Loomly
Your next bug is waiting to be quacked at.
100 free quacks every month. No credit card. The duck is patient.