Sound Booster & Equalizer

Sound Booster & Equalizer makes your phone louder and clearer using Android's own audio engine - and shows the real gain in dB on a big dial.

Boost, Tune and Extras are three tabs under the master switch.

LOUDER, WITH THE REAL NUMBER
• Raise media loudness by up to +15 dB through Android's Loudness Enhancer
• Safety zones warn you before levels that can distort your speaker or hurt your ears
• Soft start eases the boost in from every switch, widget and routine

5-BAND EQUALIZER
• Vertical sliders with the gain above each one, and a live curve of what you set
• Built-in curves plus your own saved presets
• Sound modes: Flat, Music, Bass, Vocal, Movie, Game, Outdoor and Night - one tap sets everything

PRO STUDIO
• Bass Tuner: a subwoofer-style low shelf (40-100 Hz) - only the lows move, and a peak limiter prevents clipping
• Quiet Hours: Night dynamics and a lower boost cap at night, restored in the morning
• Headphone Library: 87 headphone models with measured correction curves - browse free, apply in one tap

SLEEP TIMER AND OUTPUT PROFILES
• The sleep timer fades the volume down, then switches the effects off
• Speaker, wired headphones and Bluetooth each remember their own preset, boost and volume
• Volume lock keeps media volume where you left it

VOLUME SCENES AND PER-APP LEVEL
• Save media, ringtone, notification, alarm and call volume as a scene and switch in one tap, with Undo
• Link a scene to headphones or car Bluetooth to apply it on connect
• Give a supported music player its own level, always within the safe listening cap
• 3 scenes, 1 linked device and 1 player level are free; more with Premium or Boost Points

QUICK CONTROLS
• Home-screen widget, Quick Settings tile and notification controls
• Previous, play/pause and next under the boost slider and on the small widget
• Light, dark and true-black AMOLED themes

MORE CONTROL OVER YOUR SOUND
• Optional 10-band equalizer (31 Hz to 16 kHz) with a preamp
• Dynamics: an anti-clip limiter, and a Night mode that brings explosions down and dialogue up
• Low-volume bass compensation for quiet listening
• 3D surround virtualizer and reverb, from a small room to a hall
• L/R balance and fine volume steps for uneven earbuds (Premium or a 24-hour unlock)

HEARING SAFETY
• The safe headphone limit caps the boost on headphones while it is on
• After long loud listening the app suggests a break and eases the boost down
• Speaker guard eases deep bass on the phone speaker at high boost (can be turned off)
• When headphones connect, media volume rises gently over 2 seconds

AUDIO LAB AND ROUTINES
• Audio Lab: safe listening profile, reference curve, headroom advisor, test tones and health check
• Audio routines apply a sound mode by time, weekday and output

FREE TO START · PREMIUM WHEN YOU WANT
• Boost, Tune and Extras are free to use, with no ads
• Unlock a Pro Studio tool for 24 hours with Boost Points; new users get welcome Boost Points
• Premium unlocks every Pro Studio tool - choose monthly, yearly (with a 3-day free trial where offered) or a one-time lifetime purchase
• Optional Point Packs are consumable purchases via Google Play Billing; subscriptions can be cancelled any time

HONEST ABOUT ITS LIMITS
This app uses only the official Android audio effects. It cannot push your hardware past its physical limits and it does not claim a boost percentage no phone could deliver.

The app shows where its effects land: players that announce their audio session get them directly, the rest via the global session.

All audio processing happens on your device. Nothing is recorded and no audio is uploaded. Firebase Analytics and Crashlytics are optional in Settings.

No account. No sign-up.

Note: some manufacturers' own audio processing limits certain effects. The app tells you, and the rest keep working.