Save time reviewing AI-generated code, without slowing your agent down

What you'll see after every session, and every week

Good protection is invisible: the bug that never shipped looks like a quiet day. So Cotterpin shows its work. When a run ends, the session card shows what it checked, what it refused and what the run cost, and how much routing each stage to the right model saved. Every Monday, the weekly card adds it up: how many runs landed, how little time Cotterpin added, what you saved, and how quickly the plan pays for itself.

Coming in the next release These are examples with illustrative figures: the session and weekly cards ship in the next release. Your own cards will show your own runs, measured on your machine.

Cotterpin · session complete  Task      add rate limiting to /api/orders  ✓ landed
  Duration  14m 32s   Stages 6   Agents 3
  Cotterpin fired 23×  ✓ 19  ✗ 3 refused  ? 1 asked

  Cost      $1.84  API-equivalent
  Savings   $1.21 saved (40%) vs all on Opus · high
  Tokens    +66% extra tokens on a monthly plan
            ▸ 4 stages on Sonnet · medium, 2 on Haiku · low

  Details   cotterpin runs show 7f3a

Cotterpin · your week · 29 Sep – 5 Oct  Runs       64  58 landed  6 waited for you
  Agent time 15h 20m
  Time Cotterpin added 2m 41s (0.3% of agent time)
  Cotterpin fired 1,412×  ✗ 87 refused, 5 destructive

  Cost       $117.80  baseline $195.24
  Saved      $77.44 this week  ▲ $9.10  at API prices
  Tokens     +66% extra tokens on your plan (≈ $132 of a $200 plan)
  On track   ≈ $335 / month · ≈ $4,000 / year
  Pro ($100/year) would pay for itself in under 2 days

  You        ◆ Scout Bug Hunter grade 1 of 7
  Plan       Watch  free (reports what Pro would enforce)
  Bugs       4 reported  3 verified  1 pending
  Rewards    14 points  1 free month earned

  Details    cotterpin report weekly

Cost is the API-equivalent at published prices; savings compare Cotterpin's model and effort routing with running every stage on the tier your agent is set to use. You'll be able to hide the card at any time, and the full trail stays on your machine.

Time: where the hours come back from

Speed: it doesn't slow your agent down

• Delta-only. Each task gets a real build and the tests your change can reach — not the whole suite. Unchanged inputs reuse their proof.
• A light hook. The hook every agent tool call passes through takes about 40–60 ms of CPU time per call (the measured median for each kind of call), and a commit's fast tier runs in seconds.
• Held to budgets. Both are held to measured speed budgets in our own test suite: at most 10% slower than the baseline, or the release doesn't ship.

Effort: nothing new to learn

Money: a plain price, and your real cost measured

• Watch is free. It never blocks and never changes your code; it tells you after every session what it would have caught.
• Pro is $100 a year (about $8.33 a month) per person, for three machines. Team is $30 per seat per month, billed annually, with a 5-seat minimum. All plans.
• Your real cost per landed change. cotterpin report measures it on your machine, from the prices you set — nothing is uploaded.

Work it out with your own numbers

Put in your own figures. The starting values are examples, not measurements — replace them. Nothing you type leaves this page.

Earn it back: Bug Hunter

In development Bug Hunter is being built now and is not available yet. Below is the scheme we have decided on; details may change before it launches, and this page will change with them.

Find a real bug in Cotterpin and report it from your terminal. The report is built and redacted on your machine, and you see exactly what is sent before it goes. Every verified bug earns points, and points become free months.

The higher your grade, the fewer points a free month costs, and the more you get: the beta channel, priority triage, a vote on the roadmap and a place in the Hall of Fame (opt-in, anonymous by default). For example, three major bugs and one minor make 10 points: one free month at Scout. Security bugs go privately to security@cotterpin.io. Your reports, their triage and the credit they earn will show on your developer dashboard, coming in the next release.

Questions people ask