Otii not connecting on Catalina 10.15.3

Hi everyone,

I just got an Otii and when I try to start a new project and connect the Otii I get a message ‘Connect your tool!’ and the Otii makes a clicking sound for a while. I am running the software on MacOS Catalina 10.15.3 on my 15 inch 2018 Macbook pro.

When I boot into Windows the Otii connects and everything works fine, so it’s not a hardware issue. I’m logged in on the app and I’ve updated to the latest firmware (using Windows) but the MacOS app still doesn’t connect. Also, when I start a tcp server from preferences and run an example python script I get ‘No Arc connected!’ log. Any suggestions?


I got it to work when I connected 9V power adapter to the Otii. It is weird that it doesn’t work just on USB power on MacOS (I’ve updated to latest 10.15.4 too) especially given that it works on Windows on the same device.

Hi Leszek and welcome to the forum.

Thank you for reporting this and sorry for late reply.
We will look into this, perhaps there is some timing issue.

Best regards,

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