# CALC Smart Calculator ± vs NSD Nurith Security Device

The clearest difference is in-app purchases: NSD Nurith Security Device at none against CALC Smart Calculator ±'s 4. NSD Nurith Security Device also leads on iOS requirement (11.0 vs 17.0). CALC Smart Calculator ±'s advantage is update cadence (fortnightly vs every 5 months). On price, ads and device support there is nothing between them.

Both are free to download. CALC Smart Calculator ± sells 4 in-app purchases, starting at $0.99 per 3 months. NSD Nurith Security Device asks for nothing beyond the download.

CALC Smart Calculator ± ships an update fortnightly, NSD Nurith Security Device every 5 months. The most recent releases landed on October 23, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | CALC Smart Calculator ± | NSD Nurith Security Device |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (2.4K ratings)](https://appshunter.io/ios/app/calc-smart-calculator/id576675190/reviews)** | — |
| Number of ratings | **2.4K** | — |
| Positive reviews | 87.3% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 5 months |
| Monetization | Free with in-app purchases | — |
| Size | 16 MB | 46 MB |
| Requires iOS | 17.0 | **11.0** |
| Devices | **iPhone, iPad, Mac, Apple Watch** | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [QApps LLC](https://appshunter.io/developer/395652397) | [IMG Sicurezza Italia S.R.L.S.](https://appshunter.io/developer/1495771178) |

## What reviewers say

### CALC Smart Calculator ±

[App page](https://appshunter.io/ios/app/calc-smart-calculator/id576675190)

This app offers a versatile calculator experience with basic, scientific, and advanced modes. It features real-time results, unit conversions, custom functions, and a shareable history. Optimized for various Apple devices, it's designed for ease of use by students, professionals, and scientists.

**Highlights:** Real-time results, Unit and currency conversions, Custom functions and constants, Shareable calculation history, Landscape mode with tape-roll, Gratuity calculator

**Features:** Family Sharing, Apple Watch app, Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Quarterly Supporter | $0.99 | per 3 months |
| Quarterly Supporter | $1.99 | per 3 months |
| Annual Contributor | $2.99 | per year |
| Annual Contributor | $5.99 | per year |

**What reviewers like**

- 💻 Excellent calculator functionality
- 🎨 Beautiful and clean interface
- 🔢 Displays full calculation history
- 🔍 Useful conversion tools
- 🤖 Seamless Apple Watch integration

**What reviewers complain about**

- 💰 Subscription model introduced
- 🔒 Restricted features behind paywall
- 📊 Calculation bugs and inaccuracies
- 🔄 Unnecessary UI changes frustrate users

**Reported bugs**

- Calculation errors in certain scenarios
- Forced tutorial popup on every launch
- Unreliable widget functionality

**Requested features**

- Ability to easily clear calculation history
- Option to customize button layout
- Support for entering hexadecimal numbers
- Integration with other apps and services


### NSD Nurith Security Device

[App page](https://appshunter.io/ios/app/nsd-nurith-security-device/id1531747504)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is CALC Smart Calculator ± free?

CALC Smart Calculator ± is free to download, with in-app purchases available.

### Is NSD Nurith Security Device free?

NSD Nurith Security Device is free to download, with no in-app purchases.

### Do CALC Smart Calculator ± or NSD Nurith Security Device have ads?

Neither CALC Smart Calculator ± nor NSD Nurith Security Device shows ads.

### Which is updated more often, CALC Smart Calculator ± or NSD Nurith Security Device?

CALC Smart Calculator ± ships an update fortnightly, and NSD Nurith Security Device every 5 months. Most recently, CALC Smart Calculator ± was updated on October 23, 2026 and NSD Nurith Security Device on October 7, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*