It is not super common that wallets adding a fee for transactions, if you want to handle lightning network channels manually and use blixt wallet you can get it cheaper but then you need to maintain your own node. 

Muun is not a native lightning network wallet. In fact all transactions you send and receive in muun wallet is an on-chain transactions, they use something called submarine swaps for lightning network transactions, therefore the transactions can be higher in muun wallet. 

Are the fees lower on that than Muun? 

It says on their website:
As low as 1 sat + 0.05% of the amount sent. 

Is that percentage thing normal thing on these lightning wallets ? I haven't done that much transactions to know for sure.


BITCOIN_CEO

bitcoin

I'm withdrawing funds from here to get people off zero

Check out Phoenix it is a non-custody

https://phoenix.acinq.co/

Exist for ios and android

This is a great comparison of wallets: 
https://darthcoin.substack.com/p/lightning-wallets-comparison