AppMates

AppMates catches App Store and Google Play rejections before the stores do. It validates screenshots against each store's exact resolution, aspect ratio, alpha-channel and file-size rules, explains what broke, and can auto-repair the files.

It also checks listing text against both stores' character limits, tracks Google Play's "12 testers for 14 continuous days" closed-testing requirement (including resets from mid-streak dips), and scores app name / keyword ideas across a dozen+ storefronts before you commit to a niche.