Haunch is a calculation aid intended for use by qualified structural engineers and appropriately trained professionals. Outputs are provided for reference only and do not constitute engineering advice, certification, or approval of any kind.

All calculations must be independently verified by a competent engineer before use in any design, submission, or construction context. You are solely responsible for ensuring that any work informed by Haunch outputs complies with applicable codes, standards, regulations, and professional obligations in your jurisdiction.

Haunch Ltd accepts no liability for loss, damage, injury, or any other consequence arising from reliance on outputs produced by this service, whether or not such outputs contain errors.

By using Haunch you agree to these terms. “Haunch” refers to Haunch Ltd and its services at haunch.dev.

Subscription

Access is provided on a monthly subscription basis. You may cancel at any time via the billing portal; cancellation takes effect at the end of your current billing period. Refunds are reviewed on a case-by-case basis within 14 days of a charge — contact support@haunch.dev.

Acceptable use

You may use Haunch for lawful professional purposes only. You may not resell, sublicense, scrape, or use the service to train machine learning models without written permission.

Limitation of liability

To the maximum extent permitted by law, Haunch Ltd's total liability for any claim arising out of your use of the service is limited to the amount you paid in the 12 months preceding the claim. We are not liable for indirect, incidental, or consequential losses.

Changes

We may update these terms with reasonable notice. Continued use after notice constitutes acceptance.

Last updated: May 2026

We collect and process personal data to provide and improve the service. This policy applies to haunch.dev and is governed by UK GDPR.

What we collect

Email address and name (via Clerk, our authentication provider); payment method and billing history (via Stripe, our payment processor); calculation inputs and outputs you submit; usage metadata (page views, feature interactions).

How we use it

To authenticate you, process payments, provide the calculation service, send transactional emails (receipts, account notices), and improve the product. We do not sell your data or use it for advertising.

Processors

Clerk (authentication), Stripe (payments), Vercel (hosting). Each operates under their own data processing agreements compliant with UK GDPR.

Retention

Account data is retained for the life of your account plus 90 days after deletion. Financial records are retained for 7 years as required by UK law.

Your rights

Under UK GDPR you have the right to access, correct, or delete your data, and to object to processing. To exercise these rights email privacy@haunch.dev. You may also lodge a complaint with the ICO at ico.org.uk.

Last updated: May 2026