Looking for iPad POS, but don't need payment processing

I run a retail store, and we currently use iPads with Odoo as our POS. We're hoping to switch to something cloud based with easier inventory management - we just want to say we have ex: 16 shirts in stock, vs the Odoo inventory system that makes you use warehouses. We'd like it to be simple for our employees to input new stock that we get in.

We were considering Square, but we use an independent credit card processor, so we don't know if it would end up being clunky for our employees to use it without running cards through them.

We aren't looking to get terminals at this time - we would like to stick with the iPads for a few years so we don't need to purchase new hardware.

TIA!