Please refer to the software license for more detail.
The software is provided "as is", without warranty of any kind, express or implied, including but not limited to the warranties of merchantability, fitness for a particular purpose and noninfringement. In no event shall the authors or copyright holders be liable for any claim, damages or other liability, whether in an action of contract, tort or otherwise, arising from, out of or in connection with the software or the use or other dealings in the software.
In this demo we enter "phrase brief ceiling dream rack install fault insane panic surround glory ? library brother hill sauce access child notice picnic dinner panda purity poem"
The tool suggests several options for the missing word and the relevant one will be "asset". We can verify that by clicking on the link of the dervied Ethereum address ("0x2dfF20b40504f99c6314ac30e8DF5c02dd8058e7" listed in the "BIP44 ETH Address" column) and checking the address has transaction history.
You can use this tool without having to be online.
In your browser, select file save-as, and save this page as a file.
Double-click that file to open it in a browser on any offline computer.
Alternatively, download the file from the repository - https://github.com/KZen-networks/mnemonic-recovery/
Get the source code from the repository - https://github.com/KZen-networks/mnemonic-recovery
The project is based on Ian Coleman's Bip39 project. Get Bip39's source code from the repository - https://github.com/iancoleman/bip39
BitcoinJS - https://github.com/bitcoinjs/bitcoinjs-lib
jsBIP39 - https://github.com/iancoleman/jsbip39
sjcl - https://github.com/bitwiseshiftleft/sjcl
jQuery - https://jquery.com/
Twitter Bootstrap - http://getbootstrap.com/