Sound Booster・Increase Volume

Review by eFreeware

Sound Booster is a free Android utility from Prometheus Interactive LLC, filed under Music & Audio, and its purpose is stated plainly in the name: it pushes the volume of whatever your device is playing higher than the built-in controls allow. The reason to consider it is equally plain.

The developer says no rooting is required. The app has been on the store since June 2012 and was last updated in October 2026, so it has had a long time to settle into its role.

Where a volume boost earns its keep

The clearest case for an app like this is hardware that underdelivers. Raising the ceiling is often more useful than replacing the speaker, and that is the job Sound Booster sets out to do.

The second case is environmental rather than technical. The developer lists cars, parties, nightclubs and bars among the settings it is built for, along with any room where background noise competes with what you are listening to. That framing makes sense: a boost is most valuable when the room is loud, not when it is quiet.

Calls are covered as well. The developer pitches the app as a way to make voice calls easier to hear, which is a different problem from music playback and one that affects a lot of people in noisy environments. It also mentions ringtones and alarm volume, so the scope is broader than entertainment alone.

Boosting volume across speakers and headphones

The core function is a single-tap boost. It works across smartphones, tablets, MP3 players, Bluetooth speakers, headphones and other audio hardware, with the aim of giving you more control over music, video, ringtones and alarms.

Alongside the raw boost sits a five-band equalizer with fixed bands at 60Hz, 230Hz, 910Hz, 3kHz and 14kHz. That spread covers the low end where bass lives, the midrange where voices sit, and the treble region that governs perceived clarity.

Presets are included as well, tuned for use alongside music and streaming apps. Presets are a sensible shortcut for anyone who does not want to think in frequencies, though manual band control remains the more precise route if you know what you are listening for.

Hi-Res playback and file support

The app supports playback of AIFF, FLAC, ALAC, WAV and DSF files, which covers the formats most people accumulate when they move beyond compressed downloads.

Hi-Res playback is described as happening in 3D, and the app is presented as a sound amplifier for high-quality files. What can be said plainly is that the app accepts these formats and is built to play them back.

For anyone with a library of large lossless files, format support is often the deciding factor between one audio utility and another. It is a narrower audience than the volume-boost crowd, but it is a real one.

What the app costs

Sound Booster is free to download. It contains ads and it offers in-app purchases, so the download is not the whole story financially.

What matters is that the app is free to try, and the cost question can be settled once you see what the paid elements actually are.

With more than ten million installs and a 4.8 average across 421,000-plus ratings, the combination of ads and purchases has not stopped the app from being widely adopted.

Alternatives worth weighing

The closest alternatives are the equalizer and audio-effect tools built into many Android devices, or bundled with a specific pair of headphones through the manufacturer's companion app.

A dedicated music player is the other comparison. The difference is scope: a player organizes and plays your library, while this app is meant to sit over whatever is already playing, including streaming apps and video.

If your problem is hearing people on the other end rather than hearing music, that is the feature to judge it on.

A tool for quiet hardware and loud rooms

Sound Booster is worth installing if your phone, tablet or Bluetooth speaker runs out of volume before it runs out of music. The five-band equalizer gives you something to shape rather than just a louder version of the same sound, and the lossless format support makes it more than a one-trick booster for anyone with a serious library.

The trade-offs are the ones you would expect. The Hi-Res 3D claim is best treated as a pitch rather than a promise.

On balance this suits listeners who want more output from modest equipment, people who take music into noisy rooms, and anyone who has struggled to hear calls in a loud place. If your current setup already plays as loudly as you need, the app has less to offer, but for the specific problem it targets, it is a focused and long-established solution.

What's new in version 3.7.4

We’re constantly making this app better. Find new features and enhancements in this release, along with a few fixes.