Comparison

P.M.M.D Calculator vs Volume Master

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

Head to head
About

P.M.M.D Calculator

Features
Read full description

P.M.M.D Calculator makes division, multiplication, addition and subtraction steps quickly and easily. Easy to understand. Perfect for teachers, students, or anyone who wants to learn or prepare math exercises. Features: • Clean, easy-to-use interface. • Instant calculation results. • Copy answers into other apps. • Save results as an image directly to your camera roll. • Customize font type, text color, and background color. • Option to show or hide calculation steps [Plus/Minus]. • Option to show or hide the remainder [Division]. • Option to show or hide the plus sign in calculations [Multiplication]. This app is great for: Teachers & Educators – Create math materials and examples instantly Students – Practice and understand plus/minus/multiplication/division operations step by step Parents – Quickly check kids’ homework with ease Make learning and teaching math simpler with P.M.M.D Calculator. Simplify math practice and make division, multiplication, addition and subtraction easier with P.M.M.D Calculator. Thanks for your support! Visit nitrio.com for more great apps for your iOS devices.

About

Volume Master

Easily set and manage your preferred audio levels for music, videos, and audiobooks. Save favorite volume settings for quick access and add them to your home screen for instant recall.

Highlights
  • Set custom volume levels
  • Manage favorite volume settings
  • Add favorites to home screen
  • Quick access to saved volumes
  • Control music, video, and audiobook volume
Features
Read full description

Volume master app lets you select the perfect volume level so whatever sounds, videos, music, or audio book you listen sounds just right. You can also manage your favorite volume level in settings. Add your favorites to home screen and the app will save it for reuse. - Volume Master is constantly being updated and improved. - Leave a comment and tell me what feature you want to add. - Rate the app if you like it!

Screenshots

P.M.M.D Calculator4 screens
Volume Master3 screens

Verdict

The call

The clearest difference is price: Volume Master at Free against P.M.M.D Calculator's $3.99. Volume Master also leads on update cadence (every 2 months vs every 22 months). P.M.M.D Calculator's advantage is in-app purchases (none vs 1) and iOS requirement (13 vs 16.0). On ads and device support 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

Volume Master is free to download; P.M.M.D Calculator costs $3.99 up front. Volume Master sells 1 one-off in-app purchase. P.M.M.D Calculator asks for nothing beyond the download.

UpkeepUpdate frequency

P.M.M.D Calculator ships an update every 22 months, Volume Master every 2 months. Both last shipped on October 27, 2026.

Scorecard4 real differences · 6 level
P.M.M.D Calculator versus Volume Master: the parameters behind the verdict, then further details
ParameterP.M.M.D CalculatorVolume Master
Price$3.99Free — better
Rating—4.2 (216 ratings) — better
Positive reviews—54.2% of reviews
Number of ratings—216 — better
Update frequencyEvery 22 monthsEvery 2 months — better
AdsNoNo
In-app purchasesNo — betterYes
Monetization—Free with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, Mac
Requires iOS13 — better16.0
Further details — not scored
Size1 MB4 MB
Age rating4+4+
DeveloperHeng Jia Liang娜 张

In-app purchases

None

P.M.M.D Calculator

No in-app purchases

1 purchases

Volume Master

One-time1
  • Remove Ads$0.99

Questions

Is P.M.M.D Calculator free?
P.M.M.D Calculator costs $3.99, with no in-app purchases.
Is Volume Master free?
Volume Master is free to download, with in-app purchases available.
Do P.M.M.D Calculator or Volume Master have ads?
Neither P.M.M.D Calculator nor Volume Master shows ads.
Which is updated more often, P.M.M.D Calculator or Volume Master?
P.M.M.D Calculator ships an update every 22 months, and Volume Master every 2 months. Most recently, P.M.M.D Calculator was updated on October 27, 2026 and Volume Master on October 27, 2026.

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