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A general rule for Homey cloud:
Apps with settingspages and/or app to app communication are not allowed by Athom.
Homekit Controller doesn’t seem to have those criteria (anyone here knows?) -
Here’s a Homey cloud (un)available app wiki:
Homey (cloud / bridge version), a selection of available apps (WIKI)
You could send the developer a mail.
Contact info is always presented at the bottom of the app pages