Fettle
Why
Most people can’t tell whether their PC is healthy. The tools that could tell them show raw numbers for people who already know what they mean. Fettle reads the same data and says what it means: verdicts first, numbers second.
What was hard
Reading disk and TPM health without administrator rights, and making sense of SSD wear values that every maker reports differently. Partway through, I replaced the Tauri desktop app with a native Slint one, and swapped the website’s TypeScript engine for the same Rust code compiled to WebAssembly, checked against the old one on 405 test cases in English and Italian.
What it won’t do
It only reads. It doesn’t clean, “boost” or change anything, and it sends nothing on its own except an update check you can turn off.
