One straight answer, no catch.

Most "free" tools online make you trade something for the answer — an email, your attention, your data, or a paywall right before the result. No Catch is the opposite bet: each tool answers one specific question, shows its work, and gets out of your way.

Every tool here is free to use with no signup and no tracking. Where a tool offers something paid, it's an optional one-time download after you already have your answer — never a gate in front of it. When a calculation depends on assumptions, we show them and let you change them.

New tools get added as we find specific questions people are searching for and not getting a fair, simple answer to. If there's one you wish existed, that's exactly what we're looking for.