Once you've amassed a list of beta testers, here are the must have tools to help you work with those early users and improve your app.

1) UserVoice
Feedback is key. Not having a way for your users to give feedback is a product sin. Especially in the start stage. Most of your analytics in the start stage are statistically insignificant.

With UserVoice it's extremely easy to add a small widget into your app where they can send feedback directly to you on how they like the app and features they wish it had.


2) Crashlytics
When you have a new app it's going to be buggy, but where is your app breaking? Crashlytics is a great service to help you fix all those annoying bugs.


3) Amplitude

Although analytics aren't as useful at this early stage, they are extremely useful to determine who is coming back and using your app and to proactively reach out to those that are and aren't and learn why.

Make sure you have a tool to know which of your users are visiting your app and what they are doing the most. Is one of your big features used by only 1% of your users? Use Amplitude and find out.