Crittercism's dashboard shows all the information needed for finding and fixing bugs. It displays all running threads at the time the crash occurred, memory usage, battery level, disk space, sdcard space and other important information about the device.
If you've got a small app, with a limited number of users and almost zero revenue. You can always go for Bugsense's free plan. However there's a catch : the free plan comes with just 7 days data retention.
Even though it might seem ironic, but one of Bugsense's pros is also one of its cons. The free plan is limited to only 500 crashes a month, and has a pretty tight limit on the size of the APK (Android) you can integrate it with.
Like all the other error tracking applications, Exceptional.io also offers a good user interface with a vast list of powerful functionalities namely: intelligent error grouping, view backtraces, filter by recency, capture custom data, etc.
Airbrake.io boasts a beautiful user interface which gives easy access to features such as intelligent error grouping and application insights, session details and backtraces. All these allow you to squash those bugs at a much faster pace.
Airbrake is non-free software, so it cannot be self-hosted, audited, or improved upon by the community. Your data is insecure - open to be read by Airbrake Inc, and if they shut down you will be unable to continue using the software.