error-keeper

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More free tools

Everything on this page runs in your browser too, except this one lookup: what you type here also goes to x, because that is what checking it means — see the note on this page for exactly what is sent.

Best-effort hosting, no SLA. These tools are free and experimental, and may be slow, broken, moved, or taken offline without notice. We do not promise uptime, or that a URL will keep working. Do not use this as a system of record.

Canada Crypto ACB Calculator — free, private, in your browser
Cancel Flow — save-offer cancellation flow for Stripe, self-hosted
Changelog Keeper — changelog page, feeds and a What's new widget, self-hosted
Churn Radar — see who is about to cancel before they do

Browse all 1321 free tools → · About & privacy · Report a problem or suggest a feature · Run your own copy

Free, and staying free. If one of these saved you time or money, you can sponsor on GitHub or buy me a coffee. Either is optional and changes nothing about what these tools do.