Free tools license and credit

What you may use

You may use all 20 free calculators, including their supported JSON API and MCP interface, for personal, commercial or any other lawful purpose at no charge, and you may copy, modify, publish and distribute KlarFort-authored calculator text, documentation, outputs and derived tables, including in paid products and services, in each case provided you credit KlarFort with a link to https://klarfort.com/.

How to credit KlarFort

Place a visible credit near the reused material or in the credits for your work or integration. One clear credit per work or integration is sufficient; no separate credit per API request is required. Links to individual calculators are optional.

For example: Powered by KlarFort.

Copy this HTML for a website or app:

<a href="https://klarfort.com/">Powered by KlarFort</a>

Where hyperlinks are unavailable, include the KlarFort name and full homepage URL as text. For private use, retain the credit in saved material or project documentation.

API and assistant integrations

Computed with KlarFort Calculators, https://klarfort.com/

API and MCP calculation results include this ready-to-use credit and the homepage as credit_url. Display the credit in your integration or its credits. Preserve it when passing results to another service or assistant. The citation_url is an optional reference to the specific calculator.

Sources and full terms

Third-party datasets retain their own terms and source attribution requirements. Check the Sources section on the calculator you use. KlarFort does not sublicense third-party data.

This is KlarFort's free-tools permission, described in the Terms of Service. It takes precedence over the general personal-use and commercial-use restrictions for these tools. The Disclaimer and published service-protection limits continue to apply.

KlarFort is not financial, investment, tax, or legal advice. Verify outputs before making material decisions.