Every summer, my family goes back to the same spot on the Greek coast — a small campsite by the sea, the same pitch we've grown to love. The hard part isn't the trip. It's the booking.
The campsite opens its reservation form once a year, on a specific date, at a specific hour — not a rolling system, not "book anytime before you go." A single announcement window. If you're not looking at the page at exactly the right moment, the spot you wanted is a memory instead of a plan.
Two years running, I missed it. Not because I forgot the trip existed — because I forgot to check one specific webpage at one specific hour, months in advance, for something that wouldn't matter again until the day actually arrived.
I'm a network and cybersecurity engineer. I spend my working life thinking about systems that watch things automatically — logs, traffic, anomalies — so it started to genuinely bother me that I was the automation for this one, and a bad one at that. A computer can check a page every few minutes without getting distracted, without forgetting, without needing to remember three months from now that today is the day. I couldn't.
So I built the thing I actually needed: a small Telegram bot that watches a page for you, and tells you — once — the moment something changes. Not a feed. Not a dashboard you have to remember to open. One message, at the moment it matters, in the app you already have open anyway.
I called it Admonere — Latin for "to give notice, to warn in time." Fitting, since that's the entire job.
You send the bot a link and tell it what you're watching for: a booking that opens, a price that drops, or just "tell me if anything on this page changes at all." It checks quietly in the background — free accounts every few minutes, paid tiers faster — and stays completely silent until there's something worth telling you. Then it messages you, once, and goes back to watching.
That's genuinely the whole product. No app to install. No account beyond the Telegram chat you already have.
Once I built it for myself, it was obvious this wasn't really about campsites. It's the same shape of problem as:
Admonere doesn't care which of these it is — it just watches, and tells you once.
There's a free tier, genuinely usable, not a crippled trial. If you end up needing more watches or faster checking, there are two small paid tiers — but nothing about the free version is designed to annoy you into upgrading. It's just capacity, not features.
If you've got your own version of the once-a-year booking window, I'd genuinely like to hear about it — reply to the bot with /feedback, or just try it on whatever's been bugging you.