Echo

Echo is an Android audio recorder built around the idea of keeping recent sound available before the user explicitly saves it. Instead of starting from an empty recording each time, it can maintain a rolling audio buffer, so a short segment can be preserved after something has already happened. This makes it suited to notes, spoken remarks, or sounds that are noticed too late for a conventional recorder.

The application is published by Marek Rogalski under the GPL-3.0-only license. Its scope is specific: it is an Android app for capturing audio, not a desktop editor or a full audio production suite. Users looking for timeline editing, multitrack work, or cross-platform recording should consider that limitation.