OneJobKit

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Burn after reading

Some things should exist exactly once: a password handed to a new colleague, a recovery code, an address given to somebody who needs it today. Chat apps and email are the opposite of that — they keep a copy on every device, in every backup, and in whatever the recipient's employer archives. A link that deletes itself on first read leaves the message nowhere except in the head of the person who read it.

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What to expect

Opening the link destroys the server copy immediately, so the recipient gets exactly one chance to read it. Note that link-preview bots in chat apps cannot trigger this — the note is only fetched after an explicit click on the page.

Other presets

Same tool, a different requirement.