Filters, oil, batteries, cartridges. Tell When2? how often something needs doing and when you last did it. It works out what’s due, and reminds you before it isn’t.
Nothing here. Add something you keep forgetting.
What you enter
How often it needs doing, and the last time you did it. Two facts you actually know.
What you get
The due date, worked out fresh every time you look. Mark something done and the next one moves on its own. Nothing to keep up to date, so nothing can go stale.
Things people track
Who made this
I bought the same air filter twice in one year, and let an oil change slide by two months, because the only record of when I last did either was my own memory. Every app I tried wanted a due date, which is the one thing I never know.
So When2? asks for the two things I do know: how often it needs doing, and when I last did it. It works out the rest, and emails me before it goes wrong rather than after.
I also built Owed?, which keeps track of money you have lent friends and family, for the same reason: I was tired of guessing.
