Catch the bug only two users can make.
Collision Canary drives two real browsers at the exact same moment, then proves whether your app keeps its promise: only one person can grab the last seat.
Both click at once. Only one should win.
Your tests pass. Your users still collide.
Single user tests never see it. The failure only shows up when two people act on the same thing at the same instant, and one shared record says yes to both.
One seat, two winners. That is the bug.
Four steps, two real browsers.
Arm
Two live browsers open the same action and wait.
Release
Both fire at the exact same moment.
Check
We test the promise against the real database.
Repair
A fix packet goes to your coding agent, then re-run.
Actual Chrome sessions, driven by Kane, not scripted mocks.
A shared Neon Postgres row and a real transaction decide the winner.
A redacted, hashed task your agent can act on. Then prove the fix.
The last seat is everywhere.
The final airplane seat. The last concert ticket. One promo code left. Each one is a race two users can break at the same instant. Collision Canary makes that race visible and proves who really wins.
Every run is a real record.
No screenshots, no promises. This is the most recent proof, straight from the database.
- Winners
- 1
- Seats left
- 0
See it collide, then watch it get fixed.
Run the last-seat test on a live app in under a minute.