Terms of Service

Agreement

By using this website or a ProofGrit subscription you agree to these terms. If you use ProofGrit on behalf of a company or lab, you confirm you are allowed to accept these terms for it.

Who we are

ProofGrit is run by an independent sole proprietor.

Calculations and professional responsibility

ProofGrit performs arithmetic based on the values you enter. It does not perform tests, inspect materials or make engineering decisions.

You remain responsible for following the current standards and your project specifications, for checking inputs and results, and for any decision or report based on them. Results relate only to the items tested.

Subscriptions and payment

Our order process is conducted by our online reseller Paddle.com. Paddle.com is the Merchant of Record for all our orders. Paddle handles payments, billing questions and refunds.

Plans renew automatically every month or every year until you cancel. You can cancel anytime in Settings, Billing, Manage billing. Your plan stays active until the end of the period you paid for. After that your lab becomes read-only: you can still view and download your reports. Email support@proofgrit.com at any time to have your lab's data deleted.

Prices are in US dollars. Sales tax or VAT is added at checkout where it applies. Current prices are listed on the pricing page.

Refunds are covered by our refund policy.

Acceptable use

• Do not try to break, overload or gain unauthorized access to the service.
• Do not upload content you do not have the right to use.
• Do not use the service for anything unlawful.

Your data

Data you enter remains yours. We use it only to provide the service, as described in our privacy policy.

Our content

The website, software, calculators and guides are owned by ProofGrit. Standard names and numbers are mentioned for reference only; the standards themselves belong to their publishers.

No warranty

The service is provided as is. We work hard to keep calculations correct and the service available, but we do not guarantee it will be error free or uninterrupted.

Limitation of liability

To the extent the law allows, ProofGrit is not liable for indirect or consequential losses, and our total liability is limited to the amount you paid us in the twelve months before the claim.

Changes

We may update these terms. When we make material changes we will update the date at the top of this page.

Contact

Questions about these terms: support@proofgrit.com.