'#Bitcoin #Keeper is an open source, mobile multisig bitcoin #wallet with inheritance features. Available on iOS and Android.' https://www.nobsbitcoin.com/bitcoin-keeper-v1-2-7/
It doesnt support testnet for testing right?
Not if you install main version from appstore. When using ios testflight before I saw button to use testnet on pin-loginscreen. You can add any electrum server so that might be a way.