// terms

Terms of use

Last updated 28 July 2026

Short version: the tools are free, they run on your own machine, and what you decide to do with the numbers they give you is your call. The rest of this page just says that properly.

Who runs this

AB Integrity is operated by Sebastian Zijlstra, based in Sofia, Bulgaria. It is a personal project, not a registered company. You can reach me at [email protected] or on LinkedIn ↗.

The tools are provided as they are

Everything here is offered free of charge and without warranty of any kind. I have tested the statistics carefully and I believe they are correct, but I cannot promise the tools are free of errors, that they suit your particular situation, or that the site will stay available. Tools may change or be removed.

The output is not advice

These are calculators and checks, not a consultant. Nothing on this site is professional, statistical, financial, or legal advice, and no client relationship is created by using it. A tool telling you a result looks weak is information for your judgment, not a verdict.

Where this actually matters: if you are about to roll back a feature, end a supplier relationship, or tell a board that a test was inflated, treat the output here as one input among several. You are responsible for the decision.

To the fullest extent the law allows, I accept no liability for loss or damage arising from your use of the site, including decisions made on the basis of anything a tool reports. If some liability cannot be excluded under Bulgarian or EU law, it is limited to the minimum the law permits.

Your data and your browser

What you type into the tools stays on your machine. It is never sent to me. The flip side is worth knowing: tools that remember your work, like Lockbox, the Ledger, and Test Receipt, keep it in your browser's own storage. Clearing your browser data, switching device, or using private browsing will lose it, and I have no copy to restore. Export anything you need to keep. The privacy note covers this in more detail.

Fair use

Use the tools for whatever work you like, including commercial and client work. Please do not try to break the site, scrape it at volume, or pass the tools off as your own product. The words, code, and design here are mine; the results you produce with them are yours.

Links out

Where the site links to other people's research, platforms, or documentation, that content is theirs and I do not control or endorse what it says.

Changes and governing law

If these terms change, the date at the top of this page changes with them. Bulgarian law applies, and the courts of Sofia have jurisdiction, without affecting any protection you have as a consumer in your own country of residence.

Questions about any of this: [email protected].