What the best apps do well
The best apps do more than just add gain. They help you preview the result, avoid distortion, and keep the original file separate from the louder export.
Best use cases
- Quiet MP3s and downloaded music
- Lecture or meeting recordings
- Audio captured too far from the microphone
- Reference files that need better playback level
Why comparison matters
If the louder version cannot be checked against the original, it is easy to overdo the gain. A good app makes before-and-after comparison part of the workflow.