Apptimize provides a great tool for native mobile (iOS, Android) A/B testing. There are several benefits of the tool:
1) setting up your own test success metrics and funnels. Apptimize allows developers to designate success metrics for each test and then provides the dashboard to make it easy to compare those metrics across variants.
2) Managing tests. Ramp tests up, turn tests off, turn tests on. Feature flags. It's all there and they continue to invest and improve
3) Relationships. Apptimize invests in their customers, listens to our feedback and offers advice on our ab testing strategy.