Unlike most wallet apps that store keys in the app itself, Ethereum Smallet keys are resides in a separate app key bolt. Cold Wallet is safe because it is not connected to the Internet. Smallet Key Vault is an app that does not have internet access. It is essentially blocked from the network, providing a level of security similar to Cold Wallet.
Manage Ethereum and ERC20 tokens in one place. The concept is to support master seed and HD key to manage all virtual money in one key storage. Smart contracts are also supported.
In addition to etherium mainnet, it supports 3 test nets, so you can practice various exercises without actual ether. In particular, it supports test net and smart contract calls, so it has many features developers need.
The chrome extension, the Smollet Connector, allows you to use Dapp in the same way as a metamask. Search for "smallet" in the Chrome Web Store or use the link below.