This is an HTML script tool, similar to
IanColeman, but unlike IanColeman, it has active development to interact with public addresses, public and private BTC keys and works completely offline (always recommended).

Here are the features:
-
- Learning how entropy is used to derive wallet components
- Generating seeds via dice rolls, coin flips or playing cards
- Verifying entropy inputs (dice rolls etc) applied to external wallets or signers
- Generating BIP85 child seeds (or check those generated by a signing device)
- Generating BIP47 payment codes and their corresponding PayNym avatars
- Generating BIP47 addresses between any two payment codes
- Verifying wallet address generation from a given seed/passphrase combination
- Testing for a forgotten/incorrect passphrase (if you know a receive address)
What I want to highlight is its most recent version, the v2.3.0, which brought several features, including
Silent Payments, shamir backup, BIP-329 labels, Lightning Decoder, PSBT Inspector, etc. Some functionalities can be used without the need to generate or write a BIP-39 seed.
About Silent Payments:I confess that everything is new to me, so feel free to discuss it.
Generate a static sp1q… Silent Payment address from your seed, or decode any silent payment address into its scan + spend pubkeys. Senders derive a fresh unlinkable on-chain address per payment with no notification transaction needed.

The page now brings together a complete set of Bitcoin tools available through purple cards on the homepage, giving it a modern touch, but I personally prefer the old version, I found it much more practical than having to keep going back after accessing a card/functionality.
I think the IanColeman script will continue to be very important for learning and recovery situations, but I also think this amazing tool deserves attention and you might need it later.
Release note:
https://github.com/BitcoinQnA/seedtool/releases/tag/2.3.0