Crittercism vs TestFlight

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Crittercism
Crittercism was built up from the ground specifically for mobile. Crittercism is a complete Mobile Application Performance Management (mAPM) solution that monitors both errors within the app as well as cloud services that interact with the app.
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TestFlight
Most of the world's developers rely on the TestFlight platform for beta testing, crash reporting and analytics. Send your beta apps over the air with ease. It's simple, painless, and magical. The added benefit of unlimited devices with all the TestFlight features, at no charge. Manage devices and create custom distribution lists to selectively send builds over the air. Beta testing transparency. No longer wonder which testers received your apps & keep track of feedback.