Whats wrong with venmo? Just that it's associated with PayPal?
If square cash requires the attachment then that's a poor alternative.
Just a debit card/credit card for square cash. Venmo charges 3% fee for some cards. Square is only 3% for credit cards, accepts all debit card free of charge. I have a credit union and they want to charge me 3% per transaction.
The transactions are instant to your account. Venmo money goes into your venmo account unless you have your bank account info on there, then only with a bank account can you receive money to your bank. I don't like having my bank info on an app. And you have to manually withdraw, cause by default it goes into your "venmo balance". Square cash is all instant, bank to bank, less fee's, less B.S. too. Much simpler.
No attachment to use.