# Calculator ∞ vs Scientific Calculator Plus 991

The clearest difference is price: Scientific Calculator Plus 991 at Free against Calculator ∞'s $5.99. Scientific Calculator Plus 991 also leads on update cadence (fortnightly vs every 2 months) and review sentiment (92% vs 75%). Calculator ∞'s advantage is ads (none vs shown) and chart position (#109 vs unranked). On rating, ratings volume, in-app purchases and monetization model there is nothing between them.

Scientific Calculator Plus 991 is free to download; Calculator ∞ costs $5.99 up front. Calculator ∞ sells 4 in-app purchases, starting at $3.49 per month and Scientific Calculator Plus 991 sells 4 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 4.7 for Calculator ∞ against 4.7 for Scientific Calculator Plus 991. Both are backed by a comparable volume of ratings — 6.4K and 13K respectively. Written reviews are what separate them: 75% of Calculator ∞'s written reviews are positive against 92% of Scientific Calculator Plus 991's.

Calculator ∞ ships an update every 2 months, Scientific Calculator Plus 991 fortnightly. Both last shipped on November 6, 2026.

## The numbers

| Metric | Calculator ∞ | Scientific Calculator Plus 991 |
| --- | --- | --- |
| Price | $5.99 | **Free** |
| Rating | **[4.7 (6.4K ratings)](https://appshunter.io/ios/app/calculator/id458535809/reviews)** | [4.7 (13K ratings)](https://appshunter.io/ios/app/scientific-calculator-plus-991/id1449106995/reviews) |
| Number of ratings | 6.4K | **13K** |
| Positive reviews | 74.8% of reviews | **91.7% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 2 months | **Fortnightly** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Best chart rank | **#109** | — |
| Size | 46 MB | 169 MB |
| Requires iOS | **12.1** | 15 |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 12+ |
| Developer | [Incpt.Mobis](https://appshunter.io/developer/445261166) | [Tran Duy](https://appshunter.io/developer/1449106994) |

## What reviewers say

### Calculator ∞

[App page](https://appshunter.io/ios/app/calculator/id458535809)

**Currently charting:** #109 Top Paid · Education (US App Store)

This advanced calculator app offers a powerful math core and algebra engine for basic to complex calculations. It includes features like step-by-step solutions, handwriting recognition, and 2D graphing, making it suitable for students, engineers, and programmers.

**Highlights:** Step-by-step solution hints, Math Photos Solver, Handwriting Recognition, AI Math Problem Solver, 2D Graphing, Unit Converter, Matrix/Vector Mode

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlimited OCR/Writing 1 Month | $3.49 | per month |
| Unlimited OCR/Writing 3 Months | $8.99 | per 3 months |
| 400 AI Recognition & Queries | $0.99 | one-time |
| 900 AI Recognition & Queries | $1.99 | one-time |


### 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 Calculator ∞ free?

Calculator ∞ costs $5.99, and also offers 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, Calculator ∞ or Scientific Calculator Plus 991?

Calculator ∞ is rated higher. Calculator ∞ averages 4.7 out of 5 from 6.4K ratings, while Scientific Calculator Plus 991 averages 4.7 from 13K ratings.

### Do Calculator ∞ or Scientific Calculator Plus 991 have ads?

Scientific Calculator Plus 991 shows ads; Calculator ∞ does not.

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

Calculator ∞ ships an update every 2 months, and Scientific Calculator Plus 991 fortnightly. Most recently, Calculator ∞ was updated on November 6, 2026 and Scientific Calculator Plus 991 on November 6, 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.*