It runs on iOS devices (from version 9.0 up) and on macOS (from version 10.15 only unfortunately)
You can have the basic interface of a hexadecimal keypad and 6 led digits, but I have also added a serial terminal to it.
From the serial interface, you can load paper tapes (one of the media the KIM-1 used to save data). It's a fairly easy format to work with and is detailed in the original KIM-1 manual. Basically you just type L when in serial mode, and choose a file to import with the button just below the "screen"
I have also added some help which hopefully will get you going if you don't have experience with the KIM-1. I basically reproduced the start of the original manual, modified in a similar style where necessary.
The mac version works, but it's only an automatic "translation' of the iOS versions, and as such it has a few quirks.
The mac version is available as a release in the github repo, but since I don't have an Apple developper account at the moment, you will have to build the iOS app yourselves with Xcode :( Also, I'm not sure if Apple would approve that sort of application.
Anyway, I hope someone likes it and I'm all ears for your feedback.
Thanks.