The possibility of using one and the same profile on different devices is the premium option in CoinKeeper and is available only if you have a subscription.
In CoinKeeper you can use one account at the same time on several devices. Data between them will be synchronized.
To use one profile from different devices, you need to have the Premium subscription.
1. Install CoinKeeper on all the devices you want.
2. Log on into the profile on all the devices using the same email and password. (side Menu —> Log In).