Blog
Notes on keeping track of the things you only do now and then.
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Reminder apps assume a schedule. Some things don't have one.
Calendars and habit trackers both need you to know the interval up front. For the things you do every few months, the useful question isn't when it's due — it's how long it's been.
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How to remember when you last did something
Five ways to keep track of the last time — including three that need no app at all — and the one rule that decides whether any of them works.
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How often should you actually replace it?
Common guidance for the household things that wear out quietly — toothbrushes, smoke alarms, tyres, filters, helmets — and why the interval matters less than knowing when you last did it.