Twitter has firmly embedded itself in modern life, and by now even every housewife has at least heard of it, if not created an account there. Judging by my experience and the experience of people I know, you check Twitter very often during the day. Every day.
The idea came up to write a simple Twitter bot for notifications...
After some googling I found only English-language equivalents. Many reminder services no longer worked, others asked you to go to the site every time, almost register, fill in forms, while I wanted simplicity. Some even send reminders only once a day. The closest equivalent, judging by the description, works via PM, but if you remember the current Twitter client for iPhone, direct messages are buried far away and you do not notice them right away. In short, the desire to write my own, and in Russian, won out.
I created an account with a memorable login: @napominau.
Everything is very simple: you need to send it a tweet in the form "day.month hour:minute what to remind about".
Once a minute the bot checks tweets mentioning it and parses them. If there is a format error somewhere, it will send a reply about it.
Basically, the bot remembers whom to remind, about what, and when; once a minute it checks whether it is time to remind someone about something, and sends the reminder tweet to whoever needs it.
I suggest everyone test it and play with it. Maybe for some people it will even be more convenient than other reminder tools. And it is cross-platform too :-D.
Account: @napominau.
Format: day.month hour:minute message (the format is in the Twitter account description).