IMPORTANT: be sure to save a mnemonic phrase once a new wallet is created. Having a mnemonic phrase is the ONLY way to recover your balance in case of serious bugs or phone loss
This app features a standalone SPV Groestlcoin wallet with a fully functional built-in Lightning node. It allows to send and receive regular on-chain transactions as well as off-chain Lightning payments.
Off-chain data loss protection is present: in case of emergencies such as phone loss you will only need a mnemonic phrase to recover both on-chain Groestlcoin balance and off-chain Lightning balance.
Watchtower service is present, too: if you ever use this wallet to receive Lightning payments then you won't have to worry about getting an app online periodically.
Based on this open source Bitcoin Lightning Wallet: https://play.google.com/store/apps/details?id=com.lightning.walletapp