I've been using Fetch, Ibotta and Checkout51.
Checkout 51 is not compatible now with a new phone (Motorola) and I've gone back and forth with them a few times about that fact. They emailed me a patch to download and it did nada. I only have a few dollars "trapped" there but because of their required balance to claim, I'm basically losing that earned money. Their reply is that I am able to submit receipts I can scan on my desktop scanner, then they had the nerve to tell me if I didn't keep my account active they were going to close it. Not thrilled with CKOUT51 at the moment.