AI is starting to run engineering simulation. Someone independent has to check it.

Talk to the founderWhat it does

We are building the independent check for AI-run engineering.

0 of 23: wrong results accepted; BENCHMARKS §1 · verdicts.json
20 of 20: wrong-problem runs caught against the task; BENCHMARKS §3b · rm18.json
0 of 28: copied answers accepted; BENCHMARKS §3c · silentbench.json

Talk to the founder

Team.

Shivanshu DwivediFounder

Updates.

12 Oct 2026Released: courant 0.5.0, open source under Apache-2.0.The release
3 Oct 2026The premise proved: of the wrong-problem runs, 20 of 20 caught against the task and 8 of 20 without it.The evidence

What we say, and how.

Courant is physics acceptance testing for machine-produced simulation.Source: How it works
The gate between an AI's simulation and the engineer who signs it.Source: How it works
It returns accept, reject or insufficient, with every reason cited to the file, the method, the threshold and the value, and lists what it did not check.Source: Docs
On 31 real OpenFOAM runs it accepted 0 of 23 wrong results and rejected 0 of 8 good ones.Source: Benchmarks §1
On 20 runs with the right physics and the wrong problem, it caught 8 without the task specification and 20 of 20 against it, with 0 of 7 false alarms.Source: Benchmarks §3b
Copying the tutorial a task names executes 28 of 28 and is accepted on 0 of 28.Source: Benchmarks §3c
Preflight caught 8 of 23 broken setups before the solver started, and flagged 0 of 8 good ones.Source: Benchmarks §3
A median of 0.032 s to verify a run. Evidence packs re-derive byte for byte: 31 of 31.Source: Benchmarks §6, §7
It runs on your machine, reads files, and never edits a case, runs a solver or uses the network.Source: Security
Deterministic code decides every verdict; a language model never does.Source: Security
Certified here means measured by fault injection on real solver runs, with the error rate published.Source: Mission
Without a specification it decides whether a run is valid; with one, whether it is the problem that was asked.Source: How it works
A command contacts the network only when that is its purpose and you ran it, and it names the host first; nothing is ever sent to Courant.Source: Security
The gate is open source under Apache-2.0: github.com/courantdev/courant. Install it with pip install 'courant-dev[mcp]', or the signed single-file binary.Source: Docs
Every release is signed (Ed25519): the installer and courant update check SHA256SUMS and its signature against the pinned key.Source: Security
36 of 36 certification scenarios pass on real OpenFOAM v2406 (12 Oct 2026, courant 0.5.0).Source: Evidence
A GitHub Action gates every pull request of agent-produced cases.Source: Docs
69 of 69 artefacts (68 verdicts and a drafted specification) byte-identical across macOS arm64 and Linux x86_64, under Python 3.11 and 3.12 (courant 0.4.0, RM-34).Source: Security

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