No app or SDK to install. No complex authentication. Just a HTTP POST request with your message.
How do they plan to keep it free? Ads?
Confirming: The Privacy Policy details that all notification data is deleted within 24 hours... Does this include any additional logging or analytics data?
Suggestion: I like the "Where can I use this?" section. I would suggest adding a couple of practical examples around the already provided list of ideas.
Jokes aside, the tool looks very convenient. I have the CI/CD use case in mind. Having a GH actions template would be nice.
Have you considered publishing the code? Some people will certainly be reluctant to use the platform without seeing what it actually does with their logs, which may contain sensitive data.
Of course the difference is that it's not SaaS and you have to host it somewhere.