There was IFTTT but looking at their page now it seems like maybe they have pivoted, at least I can't tell that it works like it used to: https://ifttt.com/
It definitely inspires a "never forget" kind of mindset, such that I don't trust relying on a SaaS that I don't have a personal exit strategy for.
https://ifttt.com/products/do/button
Their site aesthetic is trying to be Nest-y, but the UX does not communicate simplicity at all.