Can you really diagnose yourself with common health apps?

Have you ever downloaded a health app, scanned a rash, or answered a bunch of questions, and then just blindly followed the diagnosis? I've done it before, and it's terrifying. Last week I had appendix pain and genuinely wasn't sure what was happening. After some internet-surfing and symptom-checking with an app, I was convinced it was a gallstone issue. Luckily, I made an appointment and got it checked out, but it turned out to be appendix appendicitis and got it removed. It was a close call, and now I'm more cautious about trusting health apps. What do you think - do those common health apps really help, or are they doing more harm than good?