Arcanist code review

Ship faster.
With confidence.

Fast code review for bugs you actually care about. Arcanist verifies your code so you can move fast with confidence.

Pieter Bruegel the Elder, The Tower of Babel, c. 1563. Built fast, by many hands. Never finished.

From PR to production

Review should help you ship.

You’re ready to merge. Then a review sends your agent off to make changes, and you’re waiting on CI again. That extra work should be worth it.

Get a review quickly after you push, so you can decide what to fix and what’s ready to ship.

Every comment sends you or your agent back to work. We focus on the bugs you’d actually hold up a merge for.

We run your code to check whether a suspected bug actually happens. You get the test and its result.

Arcanist review

We run your application and test the change. When we find a bug, we show you what breaks and how to reproduce it.

arcanistbotcommented on #1482

Arcanist review · Hold off on merging · 1 blocking finding

Review 1 on this PR · automatic on open

1. Retried payments are refused instead of replayed · blocks merge

Tested: The same payment was sent twice under one key, the second time with currency set.

Result: The second request returned 409 instead of the first response. The stored request drops currency, so a retry never matches.

Illustrative review based on a real catch. Names changed.

Why we built Arcanist

We spent about $5,000 a month on code review. We still had to inspect and test everything ourselves before we trusted it enough to merge.

So we built Arcanist to verify code, catch the bugs that matter, and help you ship faster with confidence.

Read our thesis

Built by a small, exceptional engineering team. OpenAI accelerator alumni with staff, founding, and senior engineering experience.

Where we’ve worked

Backed by

The Tower of Babel, detail. The top was never finished.