I've been pretty impressed with pullreminders.com - it is a Slack bot that alerts you for unreviewed pull requests. Seems to actually solve a real need and since the author, Abi Noda, has been pretty open about talking about it, seems it's been pretty profitable.

More info:

https://www.indiehackers.com/product/pull-reminders

Friendly reminder that the important components of a successful SaaS is marketing, marketing, marketing, and code, so how to market the app should be considered just as important as how easy it is to code.

I'd probably recommend you take whatever your idea is and offer it as a consulting service that you do yourself manually. If people won't buy that, they won't buy your app, and you can prove the idea without doing any coding at all. Once you have an audience for the service, you can just sell the automated version.