I'll send you the specs of the smartphone/tablet/PC I plan to use, so could you check if there are any issues with it running properly?

To determine whether there are absolutely no issues, verification would need to be conducted on the exact same device, and therefore we are unable to perform such checks on our end.

Supported devices and recommended environments are as follows:

✓ Teachme Biz Recommended Environment
https://help.teachme.jp/hc/en-us/articles/14572215297305

Please perform your own operational testing as needed.

Please note that Teachme Biz offers a 14-day free trial.
For more details, please refer to the following:

✓ Is it possible to try the service before implementing it?
https://help.teachme.jp/hc/en-us/articles/900005509226