Comparison

DMS2 vs Decibel：Sound Meter

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head

DMS2

Quest Data Inc. - DMS2

Noise Spectrum Analyzer

Free

🔧 Utilities

★ 3.86 ratingsView app →

About

DMS2

Features

Read full description

Enables mobile devices to access data on Quest's Data Management Service. Receive new data notification alerts. View current device status. Review historical data.

About

Decibel：Sound Meter

This application offers real-time decibel measurements with high precision. It provides detailed reports, location data, and the ability to share or export audio measurements. Users can also utilize a real-time decibel camera feature.

Highlights

Real-time decibel measurement
High precision
Location data
Decibel camera
Measurement reports
Data sharing
Audio data export

Features

Read full description

Decibel：Sound Meter is an app that can provide real-time decibel data, with the following features: -High precision measurement, real-time measurement -Provide location -Real time decibel camera -Provide detailed measurement reports -One click sharing of measurement data -Support for exporting audio data I Payment: The user deducts the payment through their iTunes account and makes the payment upon confirmation of purchase II Renewal: The user's iTunes account will be charged within 24 hours before expiration, increasing the corresponding subscription period III Cancel Renewal: To cancel the renewal, go to "iTunes Store and App Store" ->click on "App ID" to enter the "Account Settings" page, click on "Subscription", and choose to unsubscribe IV Privacy Agreement: https://docs.qq.com/doc/DVURkSmJKSll0dXBW 5、 Terms of Use: https://docs.qq.com/doc/DVXB3TWtxSUt2Rk1R

Screenshots

DMS24 screens

Decibel：Sound Meter4 screens

Verdict

The call

The clearest difference is in-app purchases: DMS2 at none against Decibel：Sound Meter's 3. DMS2 also leads on ads (none vs shown). Decibel：Sound Meter's advantage is update cadence (every 11 days vs every 4 weeks). On price, device support and iOS requirement there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Decibel：Sound Meter sells 3 in-app purchases, starting at $3.99 per 7 days. DMS2 asks for nothing beyond the download.

UpkeepUpdate frequency

DMS2 ships an update every 4 weeks, Decibel：Sound Meter every 11 days. The most recent releases landed on September 12, 2026 and October 3, 2026 respectively.

Scorecard3 real differences · 6 level

DMS2 versus Decibel：Sound Meter: the parameters behind the verdict, then further details
Parameter	DMS2	Decibel：Sound Meter
Price	Free	Free
Rating	—	3.8 (6 ratings) — better
Number of ratings	—	6 — better
Update frequency	Every 4 weeks	Every 11 days — better
Ads	No — better	Yes
In-app purchases	No — better	Yes
Monetization	—	Free with in-app purchases
Devices	iPhone, iPad, iPod — better	iPhone, iPod
Requires iOS	12.1 — better	13.0
Further details — not scored
Size	112 MB	33 MB
Age rating	4+	9+
Developer	Quest Data Inc	ZHHUALIUON INC

In-app purchases

None

DMS2

No in-app purchases

3 purchases

Decibel：Sound Meter

Subscriptions3

Weekly membership3 Days trial$3.997 Days
Monthly membership3 Days trial$4.991 Month
Annual membership3 Days trial$14.991 Year

Questions

Is DMS2 free?

DMS2 is free to download, with no in-app purchases.

Is Decibel：Sound Meter free?

Decibel：Sound Meter is free to download, with in-app purchases available.

Do DMS2 or Decibel：Sound Meter have ads?

Decibel：Sound Meter shows ads; DMS2 does not.

Which is updated more often, DMS2 or Decibel：Sound Meter?

DMS2 ships an update every 4 weeks, and Decibel：Sound Meter every 11 days. Most recently, DMS2 was updated on September 12, 2026 and Decibel：Sound Meter on October 3, 2026.