Is it possible to use the software on 2 different devices with different accounts?

Yes, that's possible. You can install OptionsApp on multiple devices and use it with different Sessions. Here's what's important:

• Each device requires its own Session to be set up.
• Each Session needs its own connection to TWS with a unique port for each.
• The number of Sessions you can use simultaneously is limited by your subscription, currently at least two parallel Sessions are included in all packages.

For example, you can manage your live trading account on a PC and run your paper trading account in parallel on a laptop, each with its own TWS instance and Session in OptionsApp.

Important: If you want to run two TWS instances in parallel, whether for paper trading or different sub-accounts, you need to set up a second user at Interactive Brokers. This user must also be equipped with live market data, otherwise complete price data cannot be guaranteed.

You can find a detailed article on using multiple Sessions and accounts here: Using Multiple Sessions and Accounts