Bip39 Github. Thanks to the cryptographic style and design of BIP-39, a weak passphrase would not lessen the safety of the other wallets or support expose the seed words. What constitutes a "great wallet" is one which has distinct, very easy to obtain documentation on supported BIP expectations, derivation paths, https://toplistar.com/story20646537/ian-coleman-bip39-https-linktr-ee-bip39-bip39-words-fundamentals-explained