Echo

Continuously record audio for retrieval at a later time. Unless saved, recordings are deleted on a rolling basis.

• record harassment and bullying (even when you didn't anticipated them)
• save important pieces of information (phone numbers / passwords / instructions)
• record cute/funny moments
• prove that someone said (or didn't say) something

Limitations The app employs a range of tricks to reduce battery usage but it's still draining quite a bit. You'll have to check your device to see how it affects your battery. Battery drain is comparable to having constant audio playback.