I'm a developer who got tired of having to rely on SaaS providers for such a simple task as monitoring an SSL certificate expiry. I had to create calendar entries just for the sake of making sure we don't forget it because of course warning emails got lost or the person responsible was on holiday..
So instead of "building yet another platform" I decide to take the un-sexy and simple route and put together a Telegram bot, called it Certimon. Thanks to Claude and Cursor I also put together a landing page for it https://certimon.com/ but I don't think you'll get any value out of it...
If you want to give it a try, just add @CertimonBot to your Telegram or visit https://t.me/certimonbot to add directly.
You can check a domain like this: /check google.com
And get reminders like: /remind google.com 30
It's 100% free, supports as many domains as you need and you won't need to sign up to anything or download anything (assuming you already have Telegram).
Hope someone other than me will find this useful, would love to hear your thoughts, comments and questions!
Edit: Forgot to mention, but the operational cost of this solution is around £3 per month on AWS.
-Tamas