A wallet, but one to one coin exchange (atomic swap) can be made with someone. So two people agree and send coins to exchange for each other (automated, of course, not based on mutual trust). Thus, you get rid of the purchase / sale commissions received by the exchanges. When sending to other addresses, the transfer fee incident is of course cut off, this is about the technology of that coin.
For coins that are not eligible for atomic swap, you can buy / sell via 3rd party exchanges (changelly, changenow, shapeshift) from within the application without sending them to the stock exchange.
There is also the feature of purchasing by credit card, but additional commission fees are paid. Ben denedim.
Most importantly, while there was a coin in the wallet, I deleted the application and tried the 12-word key recovery system and reached the coins without any problem.
It has a solid interface. You can use it both as a pc application and as a mobile application, you can use both at the same time.