This shouldn't be in the Bitcoin forum since it is about Ether which is an Altcoin. I suggest you move it to the Altcoin discussion board.
What benefits does that site offer compared to
https://etherscan.io/ for example? You enter your ETH address and whatever is stored in your wallet is displayed as part of your portfolio.
It's clearly not that useful if only need to check one address but if you have a whole wallet, like a passphrase or a hardware wallet many with addresses to check, then it could definitely be helpful.
Have you went through the site? Because i think does not offer the same services as etherscan for it was stated on their site that " it can help you if you lost your Ethereum address, Ether or tokens that you got from a mnemonic phrase" i don't what they implies nor go further since i have asked to provided some information but open code l is
though.