WebTools ownership
Original WebTools code, writing and design are copyright Nitin Raturi. All rights are reserved except for the permissions stated here and in the terms of use. The source is proprietary, not open source; its package declaration is UNLICENSED.
This notice does not claim ownership of standard formulas, facts or third-party software. Each third-party component retains its own licence and notices.
Free hosted embedding
You may display WebTools-hosted calculator embeds on personal or commercial websites, free of charge, using the iframe or loader from the integration guide.
- Keep the visible linked “Powered by WebTools” credit, calculator name, explanation link and applicable disclaimers.
- Do not hide, overlay or crop the credit or disclaimers, imply our endorsement, or present the calculator as your own work.
- Keep the calculator served from WebTools. This permission does not allow copying, modifying, redistributing or rehosting WebTools source, nor white-labelled versions.
- The service is provided as is, without a warranty or uptime commitment. Results are educational, not professional advice.
For permission beyond hosted embedding or the short quotations allowed in the terms, contact Nitin Raturi. This hosted-use permission is not a new open-source software licence and does not change third-party rights.
Software credits
WebTools is built with these projects. The linked upstream repositories describe their respective licences; the downloadable notices preserve the installed direct dependencies' copyright and licence texts.
- Astro and its Preact and MDX integrations: MIT licence; static pages, island hydration and content rendering.
- Preact: MIT licence; interactive calculator interfaces, including the React-compatible API.
- Zod: MIT licence; input and URL-state validation.
- Inter, by the Inter Project Authors: SIL Open Font License 1.1. The locally hosted font is a reduced Latin variable-font subset supplied through Fontsource.
Read the direct dependency and font notices or the full Inter font licence. These notices distinguish framework/runtime dependencies from build-only tooling; they are not a claim that every framework dependency runs in your browser.
Calculation sources and authorship
Nitin Raturi builds and maintains WebTools. Each full calculator page names its formula sources, assumptions, review date and methodology. Embedding it does not transfer the author's identity or imply financial, medical, tax or legal qualifications.
See about WebTools, how we check the maths and the editorial policy.