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What People Usually Write About

A result looks wrong? Tell us which tool you used and the exact names (and dates, if the tool asked) that you typed. Our tools follow fixed rules, so we can re-run your exact case and check it properly.

Want a calculator we don’t have? Suggest it. Half the tools on this site exist because a visitor asked — new ideas are how this site grows.

Business and partnerships For advertising, collaborations or anything commercial, email us with the subject line “Business” so it reaches the right place faster.

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One small note: we run a fun tools site, so we can’t offer personal relationship advice — but for anything about the site, the tools or your results, we’re genuinely happy to help.