Emerald is a non custodian wallet that allows you to store your funds on a desktop device only and due this reason the wallet is not so popular especially amongst the mobile device traders.
Emerald wallet isn't a bad option to desktop traders as I'm quite sure they will like the wallet's interface and design, signing up for the wallet was simple, you only provide an email and password. The security of was excellent as it has a top notch security protocol which makes you assured of the safety of your funds.
Unlike few other wallets that have an inbuilt exchange, I'm not so sure Emerald wallet has an inbuilt exchange because I saw nothing of such while using the wallet. They are always making improvements on their wallet features but in the regards to the availability of a mobile app and more collections of coins that can be stored on the wallet they haven't made any update on that recently.