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.