01These terms
These Terms of Use are an agreement between you and Shivanshu Dwivedi, doing business as Courant (company in formation), called “Courant”, “we” or “us” in them. They apply when you visit courant.dev, when you use SilentBench, and when you use a service we provide. By doing any of these you accept them; if you do not accept them, do not use the site or SilentBench.
The gate is licensed to you under its own open-source licence, as the next section says. What these terms say about verdicts and about Courant’s name applies wherever you use it; nothing in them restricts a right that licence grants.
Courant is being formed as a company. When it is, these terms and everything given under them pass to the company, which is then named here, and you agree to that now.
If you accept these terms for an organisation, you confirm that you may bind it, and “you” means the organisation as well as you. You must be old enough to enter into a binding contract where you live.
- The gate
- the Courant software: its command line, its MCP server, its Python API and its documentation, and any update we provide
- A run
- a finished simulation: its case directory, and the solver’s log and output
- A verdict
- the gate’s answer about a run:
accept,rejectorinsufficient - An evidence pack
- the files a verdict writes beside the run, with a manifest of every input it read
- SilentBench
- Courant’s benchmark of generated solver tasks, and the materials we provide with it
- A service
- work we do for you under a written agreement, such as verifying runs you send as a design partner, or a private evaluation
- A written agreement
- an agreement about the gate, SilentBench or a service signed by you and Courant
02The gate is open source
The gate is licensed to you under the Apache License 2.0, which governs your use, copying, modification and distribution of it, commercial work included, and nothing in these terms restricts the rights it grants. Its source is public at github.com/courantdev/courant.
These terms govern the site, SilentBench and any service we provide under a written agreement. The warranty disclaimer and the limits on liability below apply to those, not to the rights the licence grants; for the gate itself, the licence’s own disclaimer of warranty and limitation of liability apply.
The licence grants no right in Courant’s name or marks. You may say truthfully that you use the gate; you may not present your work, a verdict or an evidence pack as carrying Courant’s endorsement, certification or approval.
03The benchmark data
The benchmark data on /benchmarks, and as /data/benchmarks.json, is licensed under CC BY 4.0: you may share and adapt it, commercial work included, if you credit Courant and link the licence.
04What a verdict is
A verdict is an automated check of the files the gate read, decided by deterministic code from the checks it could run. Each reason cites the file, the method, the threshold and the value, and every report lists what it did not check; a check that lacked its input is not a pass.
Without a task specification the gate decides whether a run is valid; with one, whether the run is the problem that was asked. It does not decide whether a valid run matches physical reality, and it does not judge a design.
A verdict is not a certification that a design, product or system is safe, and it is not a certification by any regulator or standards body. Where this site says “certified”, it means measured by fault injection on real solver runs, with the error rate published. You remain responsible for your engineering decisions and for validating results against physical reality: do not use a verdict as the only basis for a decision about a physical system, a safety case or a regulatory submission.
05What it costs
The gate is open source and free on your own machine, commercial use included, as the pricing page says. Team and Enterprise are offered on terms agreed in writing. Nothing on this site is an offer that can be accepted to form a contract.
A design-partner engagement, a private evaluation, or any arrangement in which you send us runs or other data is governed by a separate written agreement. Where a written agreement and these terms conflict, the written agreement prevails.
06Your runs and your data
You keep every right in your cases, runs, results, verdicts and evidence packs. The gate sends us none of them, so we receive none of them and train nothing on them.
How we handle the personal information we do receive is set out in the Privacy Policy.
07Acceptable use
When you use the site or SilentBench, you agree not to:
- break the law, or infringe anyone’s rights
- attack or overload the site, get around its limits, or test its security, except in good faith and with a report to us through the security topic
- send through the contact form anything you have no right to send, or anything harmful
- present a verdict as a certification, approval or endorsement by Courant, or present an evidence pack you altered as one the gate produced
- use Courant’s name or marks in a way that suggests we endorse you or your work
- train on SilentBench’s hidden split, or use it other than as the materials provided with it allow
Machines are welcome to read the site, including /llms.txt and /facts.json, at a rate that does not degrade it.
08The content of this site
The site describes the gate and how it was measured. It is information, not engineering, legal or other professional advice, and we may change it at any time. Every measured number on it is generated from Courant’s own result files and printed with its denominator; the numbers describe the runs they were measured on, not yours.
You may read, link to and quote the site, with attribution. Anything more, such as republishing its pages, figures or films, needs our permission and, for material we use under licence, its owner’s. The site’s own content stays under these terms; the gate’s documentation in its repository is under the gate’s licence.
09SilentBench
SilentBench measures gates and agents on generated solver tasks. You may use the materials we provide for it on these terms, unless terms provided with them say otherwise.
Its hidden split, and the seed that generates it, are kept outside every repository; only their SHA-256 is committed, so the split cannot be changed after the fact. The hidden split is never licensed for training. To enter an agent, use the form’s SilentBench choice.
10Ownership and feedback
The site, the gate, SilentBench and Courant’s names and marks belong to Courant or its licensors. The gate’s licence gives you the rights it states in the gate; these terms give you only the rights they state.
If you send us feedback or suggestions, you give us a free, worldwide, perpetual and irrevocable right to use them for any purpose, with no obligation to you. Feedback is not confidential unless a written agreement says it is.
11Other companies’ software
The gate reads the output of solvers that other companies and projects make. Your use of those solvers is governed by their own licences, and holding those licences is your responsibility. If you connect the gate to an AI agent, a model provider or another service, that service’s terms govern your use of it.
OPENFOAM® is a registered trade mark of OpenCFD Limited, producer and distributor of the OpenFOAM software via www.openfoam.com. Courant is not affiliated with, endorsed by or approved by OpenCFD Limited. Other product names on this site are their owners’ trade marks, used only to identify their products.
12Export and sanctions
The gate is engineering software and may be subject to United States export-control and sanctions law, and to the laws of other countries. You are responsible for complying with them, whatever its licence allows. Those laws may forbid downloading, using or exporting it in or to a country or region under comprehensive United States sanctions, by a party on a United States government list of restricted parties, or for a purpose they prohibit.
13No warranty
To the fullest extent the law allows, the site, SilentBench and any service are provided “as is” and “as available”, without warranty of any kind, express or implied, including any warranty of merchantability, fitness for a particular purpose, accuracy or non-infringement. The gate is provided under its licence, which disclaims every warranty in the same way.
We do not warrant that a verdict is right, that the gate finds every error in a run, or that the site will be uninterrupted or free of errors. The measured error rates describe the runs they were measured on.
14Limits on liability
To the fullest extent the law allows, Courant is not liable for any indirect, incidental, special, consequential or punitive damages; for any loss of profit, revenue, data or goodwill; or for any decision taken on a verdict or an evidence pack, however caused, even if we were told such loss was possible.
Our total liability for all claims about the site, SilentBench and any service is limited to the greater of the fees you paid us for them in the 12 months before the claim and USD 100. For the gate itself, its licence’s limitation of liability applies.
Nothing in these terms limits liability that cannot lawfully be limited, such as liability for fraud, or for death or personal injury caused by negligence.
15Indemnity
If a third party brings a claim against Courant arising from your breach of these terms, or from your misuse of the site, SilentBench or Courant’s name (presenting a verdict as a certification by us, for example), you will defend Courant against it and pay the losses and reasonable costs that result. This does not apply to a claim caused by our own breach, or where the law that protects you as a consumer does not allow it.
16Ending these terms
You may stop using the site, the gate and SilentBench at any time. Nothing of yours is held with us, so there is nothing to close.
We may suspend or end your access to the site or SilentBench if you breach these terms, and we may stop offering the site, SilentBench, a service or new versions of the gate by notice on this page. Ending these terms does not end the gate’s licence, which lasts on its own terms; your runs, verdicts, reports and evidence packs remain yours. What these terms say about verdicts, your data, our rights and feedback, warranty, liability, indemnity, governing law and the whole agreement survives.
17Governing law and courts
These terms are governed by the law of the State of New Jersey, USA, without regard to its conflict-of-laws rules; the United Nations Convention on Contracts for the International Sale of Goods does not apply. Any dispute about these terms belongs exclusively to the state and federal courts located in New Jersey, and you and Courant submit to their jurisdiction.
If you use the site or SilentBench as a consumer, you keep the protection of the mandatory laws of your country of residence, and you may bring a claim in its courts where those laws give you that right.
18The whole agreement
These terms, the Privacy Policy, the gate’s licence and any terms provided with particular materials are the whole agreement between you and Courant about the site, the gate and SilentBench. A written agreement signed by you and Courant prevails over these terms where they conflict.
If a court finds part of these terms unenforceable, that part applies as far as the law allows and the rest stands. If we do not enforce a right, we have not waived it. You may not transfer these terms without our written consent; we may transfer them to a company that takes over Courant or the business they concern. No one else has rights under them.
19Changes to these terms
We may change these terms. When we do, the version and date at the top of this page change with them, and the new terms apply to your use from that date; they do not apply to a dispute that arose before it. If you keep using the site or SilentBench after a change, you accept the new terms. A change to these terms never changes the licence of a version of the gate you already have. Earlier versions are available on request.