“The full screen ads, some of them locked & timed, displayed any time you try to access the booster, even when the app is already open, PLUS an animated ad window taking up half the screen with the control slider on it, seemed over the top…”
Independent automated assessment · 6 signal sources · 478 reviews scanned · analyzed 2026-10-04.
Volume Booster for Android
ZipoAppsSound amplifier will help you to increase volume levels on your device.
4.6 ★163,252 ratings
10M+Downloads
4+Age rating
—App size
Free · In-app purchasesIn-app purchases
About this app
Sound amplifier will help you to increase volume levels on your device. With the sound booster, you will have a louder volume instantly. Using sound maximizer is the easiest way to boost volume on speakers and headphones.
Volume Booster for Android is a simple and fast way to boost volume on your android device. The sound amplifier is helpful to achieve louder movies, louder audiobooks, and louder music.
Great Features of Volume Booster - Sound Amplifier ★ Super volume up - boost volume instantly ★ Music volume booster - Increase your music volume easily ★ Increase your voice call audio ★ Scale up and down the audio to suit your needs ★ Bass booster - Improve bass and woofer and feel the bass ★ Speaker booster - louder volume on your speakers ★ Music volume booster for your headphones
Powerful Sounds Booster - Boost volume instantly on your device!…
Preview
Real screenshots from the store listing.
Independent evidence report
The evidence behind this assessment
This is where the page changes from an app-store listing into an evidence report: findings, important reviews, pricing and a dated history.
Which version this describes
When we ran this analysis, and what the store lists now.
This analysis describes version 13.3.8 of the app (the version number recorded inside the package we inspected), analyzed 2026-10-04 . The app may have changed since.
The store currently lists version 13.3.8, updated 2025-08-25.
What we measured
Each line is a measurement published as a measurement, never a verdict.
Each line is a measurement, published as a measurement. Where we have not looked, the line says so rather than reading as a zero.
Developer replies to reviews
Replies to at least 1 review in 20
Price in the store description
States no price and billing period
Cancelling, in the store description
Does not say how to cancel
Themes reported by reviewers
1 theme reported
Counted from the reviews we have read for this app. "No theme reported" means no theme reached our reporting threshold — it is not a finding that nothing is wrong with this app, and we do not say it is.
Five-star share of ratings
80–89% five-star
Arithmetic on the stores' own published rating counts. It says nothing about why the ratings fall where they do.
In the package we scanned
From the package we downloaded and read — version 13.3.8, scanned 2026-09-12.
Permissions Android classifies as dangerous
None requested
Counted against the eighteen permissions listed in collect-package.ts. A dangerous permission is one Android asks the user to grant; requesting one is not itself a finding.
Analytics or tracking SDKs in the scanned package
1–2 found
Advertising SDKs in the scanned package
3–9 found
Counted as distinct SDKs in the package we scanned. One mediation bundle can contribute several, so this is not a count of advertisers.
Graded bands · predicate set 1.4 · how these are measured
What the analysis found
App-specific findings, grouped by what each one rests on. How they are graded lives on its own page.
The catch list 2
Charges we publish at a strength we stand behind: measured from an artefact, agreed by independent sources, or reported by enough users to clear that charge's own published bar.
Multiple ad networks bundled
The package embeds several distinct advertising or mediation SDKs — a stack built for ad volume, not for a single house ad.
What we saw: Bundles 6 distinct ad networks / mediation SDKs: Amazon Publisher Services, AppLovin MAX, Google Mobile Ads (AdMob / Ad Manager), Meta Audience Network and 2 more
Aggressive ad load
Advertising volume or placement that interrupts normal use: ads between every action, unskippable or forced full-screen ads.
What we saw: Progress is gated behind watching an ad: "Watch a video to earn a reward!"
Positive evidence 1
Things this app does right, published at the same strengths as the catch list.
Developer says data deletion can be requested
The developer's data-safety disclosure on the store states that users can request deletion of their data, or the app's own text offers a way to delete the account. This restates what the developer declares; it is not a test of whether deletion works. Apple publishes no equivalent disclosure, so on an Apple-only listing only the app's own text can support it.
What we saw: The developer's store data-safety disclosure states that data deletion can be requested; we have not seen a deletion control in the app's own text
One source only — shown, not confirmed 1
A single kind of evidence. We publish these because withholding them would be the bigger distortion, and we do not treat any of them as a finding we stand behind.
In the app's own text: Countdown-timer purchase pressure
The app's own purchase copy attaches a deadline to buying — a countdown, 'offer ends in', 'limited time' — or ships a countdown view on a purchase-screen layout.
What we saw: Deadline pressure in the app's own copy: "Limited time offer"
Highlighted reviews
Representative public review excerpts shown as user reports, not Appworthy audit evidence.
“ads pop up every single time you open the app, even if you already have it running in the background. would not recommend downloading 0/5”
“I'm sure it's a great app! Unfortunately, they bombard you with so many adverts it's made it unusable, which forced me to immediately uninstall.”
Assessment & version history
App changes and Appworthy events in one timeline.
Store listing updated to version 13.3.8.
What this app sells
Useful store-disclosed pricing, kept below the app listing.
Items shown0
Lowest—
Highest—
Google Play does not publish per-purchase prices.