Atom Calculator vs Mahjong Camera
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Atom Calculator
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The atom calculator is a tool for calculating the atomic number and the mass number based on numbers of atom components - protons, neutrons, and electrons (or vice versa). In addition, you can define the charge of ions with known numbers of protons and electrons.
Mahjong Camera
Effortlessly calculate Mahjong scores by scanning your winning hand. Supports multiple game variations and provides a waits calculator to identify all possible winning patterns. Save and share score tables easily.
- Scan winning hands for instant scoring
- Supports Riichi, Hong Kong, Taiwanese Mahjong
- Mahjong waits calculator
- Save and share score tables
- Record game scores
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• Calculate Han/Fu/Faan/Tai in seconds by scanning your winning hand • Supports multiple mahjong variations: Riichi Mahjong, Hong Kong Mahjong, Taiwanese Mahjong, and HK Style Taiwanese Mahjong • Mahjong waits calculator: Find out all wait patterns and never miss a chance again • Save Faan table as images or share via AirDrop and other methods (HK Style Taiwanese Mahjong) • Record mahjong game scores with ease
Screenshots
Verdict
The clearest difference is price: Mahjong Camera at Free against Atom Calculator's $2.99. Mahjong Camera also leads on update cadence (every 6 weeks vs every 35 months). Atom Calculator's advantage is in-app purchases (none vs 1) and ads (none vs shown). On 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
Mahjong Camera is free to download; Atom Calculator costs $2.99 up front. Mahjong Camera sells 1 one-off in-app purchase. Atom Calculator asks for nothing beyond the download.
Atom Calculator ships an update every 35 months, Mahjong Camera every 6 weeks. The most recent releases landed on September 30, 2026 and September 29, 2026 respectively.
| Parameter | Atom Calculator | Mahjong Camera |
|---|---|---|
| Price | $2.99 | Free — better |
| Rating | — | 4.6 (10 ratings) — better |
| Positive reviews | — | 50.0% of reviews |
| Number of ratings | — | 10 — better |
| Update frequency | Every 35 months | Every 6 weeks — 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 | 12.0 — better | 13.0 |
| Further details — not scored | ||
| Size | 13 MB | 220 MB |
| Age rating | 4+ | 4+ |
| Developer | Gorasiya Vishal Nanjibhai | Wing Hin Liu |
In-app purchases
Atom Calculator
No in-app purchases
Mahjong Camera
- Premium Lifetime Subscription$7.99
Questions
Is Atom Calculator free?
Is Mahjong Camera free?
Do Atom Calculator or Mahjong Camera have ads?
Which is updated more often, Atom Calculator or Mahjong Camera?
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