Appworthy
Google Play
Version 1.2.1 · 2026-10-23
No release notes were provided for this version.
Volume Booster - Sound Booster
Volume Booster - Sound Booster (AZ Booster) gives your speaker, headphones an…
AZ Screen RecorderGoogle Play rating4.3★970 ratings
PriceFreeIn-app purchases
Age4+Store age rating
CategoryLifestyle
DeveloperAZ Screen Recorder
What we found
Full reportToo little checked to say Only reviews have been read so far (91 reviews). The app itself hasn’t been analysed.
Money
- Free to download · in-app purchases. Google Play doesn’t publish per-purchase prices.
- If you subscribe through the store, cancel in Google Play → Payments & subscriptions → Subscriptions. Deleting the app doesn’t cancel a subscription.
From review signals only, 27 Oct 2026.
The store currently lists version 1.2.1, updated 2026-10-23.
Preview
Store screenshots supplied by the developer.
About this app
Volume Booster - Sound Booster (AZ Booster) gives your speaker, headphones and Bluetooth speakers extra volume when the phone's maximum is not enough, adds deeper bass, and puts a 10-band equalizer in your hand to shape every song.
Turn one big knob or tap a quick step, and music, videos, movies, podcasts and audiobooks come through bigger and fuller. It follows your phone's keys, keeps working in the background while you use other apps, and needs no root.
A sound booster for speaker and headphones, made for quiet phones, noisy rooms and long trips.
HOW IT WORKS
1. Play music or a video
2. Turn the knob, or tap a quick step up to Max
3. Switch on the equalizer, pick a preset, add bass
4. Leave it on while you use other apps…
From the developer’s store description.
For developers and the curious
The full report
The evidence, sources, measurements and versions behind every label above.
Findings and evidence
No findings are published for this listing. These are review signals, not findings: nothing here is an assessment.
No recurring theme reached our reporting threshold in the reviews we scanned.
What reviewers report
91 reviews scanned. These are signals from public reviews, not findings. Nothing here is an assessment.
No recurring theme reached our reporting threshold in the reviews we scanned. That does not establish that reviewers had no problems.
Measurements
“Not assessed” means we could not measure it. It is never a zero and never a pass.
From store data and reviews
Developer replies to reviews
Replies to fewer than 1 review in 20
Price in the store description
The store description doesn’t list prices (most don’t)
Cancelling, in the store description
The store description doesn’t say how to cancel (most don’t)
Themes reported by reviewers
No 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 app package we scanned
No package has been scanned for this app, so nothing is published about what it ships. That is an absence of evidence, not a finding.
Sensitive permissions
Not assessed
No package has been scanned for this app
Analytics or tracking SDKs in the scanned package
Not assessed
No package has been scanned for this app
Advertising SDKs in the scanned package
Not assessed
No package has been scanned for this app
How we know
Supporting measurements: not a complete list of possible harms or positives. Measurement vocabulary 1.4 · how these are measured
Versions and dates analysed
Review signals only. No automated analysis of the app itself has been run, so there is no analysed version to report; the signals were read from public reviews on 27 Oct 2026.
Store update history
Each store’s release notes, as the developer wrote them. They are the developer’s words, not ours.
Assessment record
- Status
- Review signals only
- App identifier
volume-booster-google-volumebooster-soundbooster-fxsound- Review signals scanned
- 27 Oct 2026
- Sources used
- User reviews
- Reviews read
- 91
- Package examined
- No package scan
- Human inspection
- Not completed
How we know
- Measurement vocabulary
- 1.4
Store facts
What the stores publish. Store ratings are the stores’ numbers, not Appworthy’s, and are never averaged across stores.
Google Play
- Store rating
- 4.32 ★ · 970 ratings
- Version
- 1.2.1
- Updated
- 23 Oct 2026
- Price
- Free · In-app purchases
- Age rating
- 4+
- Size
- Not supplied
- Developer
- AZ Screen Recorder
- Category
- Lifestyle
- Listing price
- Free · In-app purchases
Purchases the store lists
What this app sells
Google Play doesn’t publish per-purchase prices.
Method and limits
How a review signal works
A review signal is produced automatically from public app reviews by a classifier — never by a hands-on Appworthy test, and never by a human analyst. It exists so a real, not-yet-audited app can carry more than a blank “Not yet tested” listing, without ever being mistaken for an assessment.
A theme only appears above once at least 5 distinct reviews corroborate it — one angry review can never tag an app. These thresholds are published settings and may be tuned as coverage grows.
It carries no confirmed findings — reviews are one kind of evidence, and nothing here has been hands-on tested. The moment Appworthy publishes a full assessment of this app, it replaces this signal, permanently.
Limits of this report
- A package scan is static. It identifies code and text in one Android build. It does not measure a live ad session, test a deletion request, or count the steps needed to cancel.
- Reviews keep their sample. A review-only charge shows distinct reviewers, the share and the sample size, and is published only once it clears that label’s published threshold. Calibration labels are machine-drafted and not yet confirmed by a person.
- Not assessed is a state. It is never a zero and never a pass.
- A missing label is not a clean bill of health. It means the evidence did not support one, not that the app is problem-free.
Not yet human-reviewed. A human review replaces this review-derived signal with hands-on, recorded measurements. Hands-on inspections are not yet open.
Request a correction
Write to [email protected], or use the form. Name the finding, the app version and the evidence that needs correcting. Factual corrections are free and never depend on buying anything.