a proving ground for ai-written code
The hard part is no longer writing code. It’s proving it works. Fusion helps you catch issues and ship reliable code.
scroll · watch trust get earned
00 · the habit
Every ship is a small act of faith.
The AI sounded sure. The demo looked right. The checks are green, if there are checks. You click the button and hope, because reading everything stopped being possible a while ago.
feat: retry on stale session+184 −32
go ahead. you always do.you click. you hope.
01 · the idea
Hope is not a review.
So Fusion stops asking one AI whether another AI did a good job. It stages a contest and lets results talk. One command in, one proven result out. Here's what that looks like.
$ fusion build "add rate limiting to the api"
02 · the contest
One task. Rival AIs. No copying.
Agents built by different companies get the same brief at the same time, each in its own sealed copy of your project. Your real code is never touched.
03 · the race
Three honest attempts beat one confident one.
Each rival solves the problem its own way. Watch every move live, and stop the whole thing with one button.
04 · the test
The code runs, or it's out.
Every attempt is built and tested for real, not just read and admired. The one that only sounded right gets eliminated here, automatically.
eliminated · gate
- ✓bun run build
- ✗bun test
- ✓lint · typecheck
05 · the jury
Judged blind, so nobody can cheat.
Independent AIs from rival companies score the survivors without knowing who wrote what. Names hidden, order shuffled. You can't favor your own work if you can't find it.
judge 03vendor hidden ▚▚▚
correctness7/7
edge cases5/7
readabilitypass
vote: candidate b
2–1 for candidate adissent preserved, never smoothedunmasked only after votes land
06 · the merge
The winner takes the losers' best ideas.
The strongest attempt absorbs the good parts of the others, and every line is labeled with where it came from.
from the winner grafted from the rival integrator’s own
- ✓ jury pass 2 · before vs after · unanimous
- ✓ qa · full re-gate · pass
07 · the recheck
Then it all gets tested again.
The combined result faces the tests and the judges one more time. If anything slips, there is no stamp.
08 · the receipt
Trust, itemized.
You get a receipt: what competed, what passed, who judged, who disagreed. When proof is missing, the receipt says so instead of rounding up.
FUSION RECEIPTrun 7692e8fd
RUN3 candidates · isolated · blind
GATEbun test · 1 eliminated
JURY3 blind judges · 2–1 · dissent kept
FUSIONwinner + grafted insights
QAfull re-gate · pass
✓ fusion_verified: true
09 · the last click
Fusion never presses the button. You do.
It opens the change for your approval and steps back. Same click as before. This time you know what you're agreeing to.
- never merges
- never ships
- never force-pushes
- never touches branch protections
the human✓ fusion receipt attached · verifiedsame button. different you.
three grades of trust
Not all “looks good” is equal.
Most AI code checkers are one bot skimming another bot’s work. That’s an opinion. Here’s the whole ladder, from guess to proof.
Fusion ships the top two. When it can’t, it says so.
proven fails closed: when the tests or the proof are missing, the stamp is withheld, never faked.
two touchpoints
Where the proof shows up.
Fusion is not an IDE plugin and not a chat window. It runs where your code lives and reports where you already work.
while it runs
Fusion Dashboard
Watch the rivals code in real time: attempts, tests, verdicts, and what it’s costing. One button stops everything, any time.
when it’s done
Inside GitHub
The prepared code arrives in GitHub with its receipt attached, waiting for your yes. Opened for review, never merged for you.
Watch, then decide. That’s the whole interface.
pricing, in one idea
You pay for proof, not tries.
Pick how big the contest is: more rivals and more judges go deeper and cost more credits. Same meter whether Fusion builds new code or reviews yours.
1 / 1 / 11creditevidence-grade
2 / 2 / 22credits✓ fusion verified
3 / 3 / 33credits✓ fusion verified
4 / 4 / 44credits✓ fusion verified
5 / 5 / 55credits✓ fusion verified
fusıon
We’re onboarding a small group of early users now. Bring one real task; leave with a change you can trust, and the receipt that shows why.
get early accesshello@fusioncoding.ai