I typically end up using basic HTML/CSS/JS for stuff like this today. If I really need backend code, I'll use basic PHP (no frameworks or anything). But this ties me to a browser, which I'm not always a fan of. Some of these fairly scrappy little projects at work (done in the browser like this, and with AutoHotKey) have been going for 10+ years now, with very little maintenance. The AHK script I haven't touched in probably 8 years, since I moved to macOS at work, yet people still use it countless times per day. If AHK decides to stop operating, it's no big deal, the code that exists will still run. The same can't be said for these SaaS solution to this problem. People looking for scrappy solutions aren't looking to remake their solution every time a founder decides to move on to something else more interesting or profitable.