# Binary Calc vs Scientific Calculator Plus 991

The clearest difference is in-app purchases: Binary Calc at none against Scientific Calculator Plus 991's 4. Binary Calc also leads on ads (none vs shown) and iOS requirement (13.0 vs 15). Scientific Calculator Plus 991's advantage is ratings volume (13K vs 6) and update cadence (every 2 weeks vs every 2 months). On price, rating and device support there is nothing between them.

Both are free to download. Scientific Calculator Plus 991 sells 4 in-app purchases, starting at $1.99 per month. Binary Calc asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.7 for Binary Calc against 4.7 for Scientific Calculator Plus 991. That said, the two scores are not equally well evidenced: Scientific Calculator Plus 991 has 13K ratings behind it against 6, so its average is the more settled of the two. Written reviews are what separate them: 82% of Binary Calc's written reviews are positive against 92% of Scientific Calculator Plus 991's.

Binary Calc ships an update every 2 months, Scientific Calculator Plus 991 every 2 weeks. The most recent releases landed on October 16, 2026 and October 18, 2026 respectively.

## The numbers

| Metric | Binary Calc | Scientific Calculator Plus 991 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.7 (6 ratings)](https://appshunter.io/ios/app/binary-calc/id301630595/reviews) | [4.7 (13K ratings)](https://appshunter.io/ios/app/scientific-calculator-plus-991/id1449106995/reviews) |
| Number of ratings | 6 | **13K** |
| Positive reviews | 82.4% of reviews | **91.7% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 2 months | **Every 2 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 1 MB | 208 MB |
| Requires iOS | **13.0** | 15 |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 12+ |
| Developer | [Buddy Sun](https://appshunter.io/developer/301630598) | [Tran Duy](https://appshunter.io/developer/1449106994) |

## What reviewers say

### Binary Calc

[App page](https://appshunter.io/ios/app/binary-calc/id301630595)

Perform arithmetic operations and convert numbers between bases 2 and 36. Supports signed/unsigned bit negative numbers with two's complement and fractions up to 8 decimal places.

**Highlights:** Arithmetic operations (base 2-36), Number base conversion, Input in different bases, Two's complement for negative numbers, Fraction support (up to 8 decimal places)

**Features:** macOS Compatibility

**In-app purchases:** none


### Scientific Calculator Plus 991

[App page](https://appshunter.io/ios/app/scientific-calculator-plus-991/id1449106995)

This app is a powerful scientific calculator with graphing capabilities, a formula library, and a unit converter. It offers natural display input, advanced math functions for algebra, calculus, and statistics, and supports various number bases and formats.

**Highlights:** Natural display input, Graphing module, Formula library, Unit and currency converter, Algebra and calculus tools, Matrix and vector operations, Statistical calculations

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Calculator month subscription | $1.99 | per month |
| Calculator yearly subscription | $3.99 | per year |
| Calculator Premium | $5.99 | one-time |
| Calculator Pro | $5.99 | one-time |

**What reviewers like**

- 👍 Intuitive and easy to use
- 🚀 Powerful and feature-rich
- 💡 Customizable interface and settings
- 🔍 Extensive library of formulas and equations
- ⚙️ Handles complex math and scientific functions well

**What reviewers complain about**

- 🐛 Occasional bugs and input issues
- 🔀 Confusing layout and button placement
- 💰 Some advanced features locked behind paywall

**Reported bugs**

- Keyboard input stops working after switching screens
- Incorrect calculation results for certain operations
- App crashes on some devices after recent update

**Requested features**

- Add option to change display font and color
- Improve cursor control and editing capabilities
- Implement auto-simplification for complex expressions
- Add more handwriting font options
- Expand graphing and equation solving features


## Frequently asked questions

### Is Binary Calc free?

Binary Calc is free to download, with no in-app purchases.

### Is Scientific Calculator Plus 991 free?

Scientific Calculator Plus 991 is free to download, with in-app purchases available.

### Which has better reviews, Binary Calc or Scientific Calculator Plus 991?

Binary Calc and Scientific Calculator Plus 991 are both rated 4.7 out of 5 on the App Store, from 6 and 13K ratings respectively.

### Do Binary Calc or Scientific Calculator Plus 991 have ads?

Scientific Calculator Plus 991 shows ads; Binary Calc does not.

### Which is updated more often, Binary Calc or Scientific Calculator Plus 991?

Binary Calc ships an update every 2 months, and Scientific Calculator Plus 991 every 2 weeks. Most recently, Binary Calc was updated on October 16, 2026 and Scientific Calculator Plus 991 on October 18, 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.*