Bip39-Standalone. It truly is very simple — if you do not be worried about copyright inheritance, nobody else will — not your application or hardware wallet sellers, not your exchanges, and never your wealth managers. BIP39 specifies a list of 2048 words from which the mnemonic phrase is decided on. https://social40.com/story4234232/bip39-generator-https-linktr-ee-bip39-5-easy-facts-about-bip39-generator-described