Bip39 mnemonic phrase tool https://go.bubbl.us/ebe220/f17a?/Bookmarks Though it works by using BIP32 system you could nevertheless import BIP39 seeds into Electrum wallet. Also aside from BIp32 There exists BIP44 Model which some wallet use to the era of seeds. Exactly how much safety does a passphrase increase? A BIP39 passphrase significantly https://thebookmarkage.com/story20151918/bip39-list-of-words-5-tips-about-bip39-checksum-you-can-use-today-https-cutt-ly-uryc5rw7