# Calculator +ㅤ vs Standard Deviation

The clearest difference is in-app purchases: Standard Deviation at none against Calculator +ㅤ's 6. Standard Deviation also leads on ads (none vs shown) and iOS requirement (13.0 vs 15.0). Calculator +ㅤ's advantage is update cadence (fortnightly vs every 2 months). On price and device support there is nothing between them.

Both are free to download. Calculator +ㅤ sells 6 in-app purchases, starting at $2.99 per 7 days. Standard Deviation asks for nothing beyond the download.

Calculator +ㅤ ships an update fortnightly, Standard Deviation every 2 months. The most recent releases landed on October 15, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | Calculator +ㅤ | Standard Deviation |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (4.6K ratings)](https://appshunter.io/ios/app/calculator-plus/id1597933199/reviews)** | — |
| Number of ratings | **4.6K** | — |
| Positive reviews | 46.7% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Fortnightly** | Every 2 months |
| Monetization | Subscription | — |
| Size | 55 MB | 21 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Rocket Apps GmbH](https://appshunter.io/developer/1566586717) | [Ahmad Sattar](https://appshunter.io/developer/1458483953) |

## What reviewers say

### Calculator +ㅤ

[App page](https://appshunter.io/ios/app/calculator-plus/id1597933199)

This app simplifies math with basic, scientific, and fraction calculations. It also features a unique snap-and-scribble function to solve problems from photos. Customize your experience with themes and access a calculation history.

**Highlights:** Snap and Scribble Calculator, Basic Calculator, Scientific Calculator, Fraction Calculator, Currency Converter, Calculation History, Customizable Themes

**Features:** macOS Compatibility, Family Sharing, Vision Pro support

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Rocket Apps PRO Weekly | $2.99 | per 7 days |
| Rocket Apps PRO Monthly | $4.99 | per month |
| Rocket Apps PRO Yearly | $9.99 | per year |
| Rocket Apps PRO Offer | $19.99 | per year |
| Rocket Apps PRO Yearly | $19.99 | per year |
| Rocket Apps PRO Yearly | $29.99 | per year |

**What reviewers like**

- 👍 Easy to use
- 🚀 Accurate calculations
- 🎨 Excellent visuals
- 💡 Helpful for academic work

**What reviewers complain about**

- 💰 Subscription model too expensive
- 🔍 Decimal entry quirks
- 📺 Too many ads
- 🔒 Locked features behind paywall

**Reported bugs**

- Inaccurate square root calculations
- Compatibility issues on iPad
- Decimal point not recognized

**Requested features**

- Negative number support
- Improved fraction calculator
- Scientific calculator layout
- Option to disable history feature


### Standard Deviation

[App page](https://appshunter.io/ios/app/standard-deviation-calculator/id6444146244)

**In-app purchases:** none


## Frequently asked questions

### Is Calculator +ㅤ free?

Calculator +ㅤ is free to download, with in-app purchases available.

### Is Standard Deviation free?

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

### Do Calculator +ㅤ or Standard Deviation have ads?

Calculator +ㅤ shows ads; Standard Deviation does not.

### Which is updated more often, Calculator +ㅤ or Standard Deviation?

Calculator +ㅤ ships an update fortnightly, and Standard Deviation every 2 months. Most recently, Calculator +ㅤ was updated on October 15, 2026 and Standard Deviation on September 30, 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.*