New Rebate Apps???

I have been using ibotta, checkout 51 and fetch rewards regularly. With the deals
that are posted on KCL + brags, I have been able to save quite a bit and I love it!!!

Lately I have come across some new rebate apps in the brags section that I had never heard of (eg Zarty, Brand club, my points).

My question is – are these new apps legit and safe to use? I love the savings but a little skeptical. Any suggestions/comments.