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Using Countly for crash reporting (https://count.ly/crash-reports/)

Apteligent, for one. Long time player with a strong offering for crash reporting and much more. (I'm not associated, just a fan.)

Ahh they used to be called Crittercism. Yeah I used to use them too

As an alternative for Digits Facebook offers Accountkit (https://developers.facebook.com/products/account-kit) which provides phone number and email based login. Full disclosure, I work for Facebook.

You can look at the most popular crash reporting sdks here: https://mightysignal.com/top-ios-sdks?tag=6

https://www.hockeyapp.net (they were bought by Microsoft)