The word he got wrong long before he got it right
For the best part of a year, your son calls a hospital a "hostipal." You correct him every time, out of habit, and he ignores you every time, out of the same habit. Then one afternoon he says it properly, in passing, about something else entirely, and it's only later, doing the dishes, that you realise you didn't notice the last time he got it wrong. There wasn't a last time you marked; the word just stopped being wrong.
Memory Jar keeps one jar per child. With two kids you keep two jars, so what you write about your daughter's day stays with her jar rather than mixed in with her brother's notes from the same week. Open the app, choose the jar, add a line or a photo, and it's saved there. No tags, no folders to sort into later.
Some of what goes in is smaller than a mispronounced word. One night your daughter asks you to stay "until the dark stops being scary," and you type it into her jar before you switch off the lamp. She stops asking within a couple of months, and you wouldn't have remembered the exact wording if you hadn't written it down that night.
Seal a jar and it becomes a keepsake you can open any time, or set it to stay closed until a date you choose, an eighteenth birthday, say, so what's inside stays a surprise until that morning. Everything you added along the way is still there, only locked until then.
None of it leaves your phone unless you choose to back it up. Turn off your phone's signal and the jar still opens, because there's no server involved in reading today's entry. Turn on cloud backup and what leaves your device is scrambled with a key generated from your own passphrase. Nobody at Memory Jar can open your child's jar; we never hold the key that would let us.
This is different from a baby-tracker app. Those want a weight at every checkup and a photo timed to six months, entries with a due date attached. Memory Jar has no fields for height or first tooth. There's a blank box for whatever line or photo happened today, useful or not.
The same jars work for a partner far away, for yourself, or for anyone else you keep one for. Read more about how memories stay private, keeping a jar across distance, or just for yourself.