I really like using plotly.

The HTTP Shortcuts app lets you send HTTP requests from your Android home screen

The primary intended use, in the case of Healthchecks.io, is to monitor the regularly running tasks on servers, such as cron jobs. However, the "alert me if X doesn't happen on time" functionality can be useful in many other contexts too. One of the quirkier ways I've been personally using Healthchecks.io is to help my [...]

It's fine that people talk to chatbots, but they shouldn't expect me to listen to theirs.