Basic Calculator vs OTMA
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Basic Calculator
A free, classic calculator app with large, easy-to-press buttons and customizable skins. It supports basic arithmetic, memory functions, and can handle very large numbers without using scientific notation. Multitasking is also supported on compatible devices.
- Large, easy-to-press buttons
- Multiple beautiful skins
- Basic arithmetic operations
- Standard memory functions
- Supports large numbers (up to 60 digits)
- Multitasking support (Split View, Slide Over)
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Calculator Free is a great free calculator with beautiful HD graphics and multiple skins! Features: - Supports multitasking on iPad devices - Split View and Slide Over features - Multiple beautiful skins - General calculations: adding, subtracting, multiplying, dividing, square-rooting - Standard memory functions: Memory Addition, Memory Subtraction, Memory Recall, Memory Clear - Thousands separators option - Can handle very large numbers - up to 60 digits! (never displays in scientific notation) - Large, easy to press buttons - Copy / Paste buttons - Key click sound effect The user interface is translated in the following languages: English, Spanish, French, Italian, German, Portuguese, Russian, Japanese, Chinese (simplified and traditional), Dutch, Norwegian, Danish, Korean, Turkish, Indonesian, Finnish, Swedish, Greek, Polish, Czech, Hungarian, Slovak, Bulgarian.
OTMA
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OTMA ( Outbound Tour Manager Association ) is an association that actively promote the recognition of the tour managing profession and also assist in promote tourism
Screenshots
Verdict
The clearest difference is in-app purchases: OTMA at none against Basic Calculator's 1. OTMA also leads on ads (none vs shown). Basic Calculator's advantage is update cadence (every 2 months vs every 19 months). 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
Both are free to download. Basic Calculator sells 1 one-off in-app purchase. OTMA asks for nothing beyond the download.
Basic Calculator ships an update every 2 months, OTMA every 19 months. The most recent releases landed on September 23, 2026 and September 8, 2026 respectively.
| Parameter | Basic Calculator | OTMA |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (3.2K ratings) — better | — |
| Positive reviews | 74.3% of reviews | — |
| Number of ratings | 3.2K — better | — |
| Update frequency | Every 2 months — better | Every 19 months |
| Ads | Yes | No — better |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 | 15.0 |
| Further details — not scored | ||
| Size | 93 MB | 4 MB |
| Age rating | +4 | 4+ |
| Developer | MobArts | Pan FarEast Resources Sdn. Bhd. |
Bugs and requests
Basic Calculator
Reported bugs
2 issues- Crashes or freezes after iOS updates
- Percent key not functioning correctly
Requested features
3 requests- Reinstate iPhone version
- Add scientific calculator functions
- Improve memory retention
OTMA
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Basic Calculator
- Banner Ad Removal$0.99
OTMA
No in-app purchases
