Smart-ID is an Estonian mobile app to identify yourself and sign online. Unlike Estonian mobile-ID it is available to Estonian e-residents and you do not need an Estonian mobile number for this.
It is safe and easy to use for logging in to online services such as Unicount, internet bank, tax office etc. You can also use Smart-ID to sign your legal documents with Digidoc application.
Unicount recommends Smart-ID to avoid any software or hardware issues common for smart cards that require a reader with a compatible OS and browser plugin.
To register a Smart-ID you need to have Estonian e-Resident card, ID-card or mobile-ID.
Register an account online here.