This looks great! The Detexify web app [1] does something similar for LaTeX notation and has been incredibly helpful. Looking forward to using Shapecatcher!
Bug fix request: On the webpage (https://shapecatcher.com/unicodefonts.html) - the download links for the fonts is broken. Perhaps fix? Also, does it make sense to combine the OTF files into a single file that shows the match you make instead of having it broken down into multiple files?
It worked for zero of the Hangul characters I tried, either from the syllables set or the Jamo composition block.
My Korean handwriting leaves a lot to be desired, especially on the phone, but it did suggest several similar katakana, so I'm surprised by the omission
I’ve used Shapecatcher since laat time it was mentioned on HN, and found it pretty dang useful and surprisingly accurate.
Pi’s worked fine for me, among others… did you draw it with multiple strokes, or maybe make the sides too straight?
[1]: https://detexify.kirelabs.org/classify.html