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Privacy policy
We use Google Analytics to understand which pages are useful. It collects anonymous usage data such as pages viewed and approximate location.
Links to Amazon are affiliate links; Amazon may set cookies when you follow them, governed by Amazon's own privacy notice.
If you send us an email address through a form, we use it only to reply or to send the list you asked for. We do not sell personal data. The calculators run in your browser and send nothing to us.