# CASIO ClassPad vs Scientific Calculator Plus 991

The clearest difference is review sentiment: Scientific Calculator Plus 991 at 92% against CASIO ClassPad's 19%. Scientific Calculator Plus 991 also leads on rating (4.7 vs 3.4) and monetization model (free with in-app purchases vs subscription). CASIO ClassPad's advantage is ads (none vs shown). On price, in-app purchases, device support and iOS requirement there is nothing between them.

Both are free to download. CASIO ClassPad sells 1 in-app purchase, starting at $1.99 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.

Scientific Calculator Plus 991 holds the better App Store score, 4.7 against 3.4. That said, the two scores are not equally well evidenced: Scientific Calculator Plus 991 has 13K ratings behind it against 11, so its average is the more settled of the two. Written reviews point the same way: 19% of CASIO ClassPad's written reviews are positive against 92% of Scientific Calculator Plus 991's.

CASIO ClassPad ships an update every 7 months, Scientific Calculator Plus 991 fortnightly. The most recent releases landed on October 27, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | CASIO ClassPad | Scientific Calculator Plus 991 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.4 (11 ratings)](https://appshunter.io/ios/app/casio-classpad/id1178870026/reviews) | **[4.7 (13K ratings)](https://appshunter.io/ios/app/scientific-calculator-plus-991/id1449106995/reviews)** |
| Number of ratings | 11 | **13K** |
| Positive reviews | 18.8% of reviews | **91.7% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 7 months | **Fortnightly** |
| Monetization | Subscription | **Free with in-app purchases** |
| Size | 56 MB | 169 MB |
| Requires iOS | 15.6 | **15** |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 12+ |
| Developer | [CASIO COMPUTER CO., LTD.](https://appshunter.io/developer/456569836) | [Tran Duy](https://appshunter.io/developer/1449106994) |

## What reviewers say

### CASIO ClassPad

[App page](https://appshunter.io/ios/app/casio-classpad/id1178870026)

Perform complex calculations, graph functions, and utilize a computer algebra system for mathematical exploration. This app offers a suite of tools for math and science learning, including dynamic visualizations and advanced functions. It's designed to enhance mathematical understanding for students and educators.

**Highlights:** Complex calculations, Graphing functions, Computer Algebra System (CAS), eActivity worksheets, Spreadsheet analysis, Geometry tools, Periodic table and constants

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ClassPad 1 Month Subscription | $1.99 | per month |


### 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 CASIO ClassPad free?

CASIO ClassPad is free to download, with in-app purchases available.

### Is Scientific Calculator Plus 991 free?

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

### Which has better reviews, CASIO ClassPad or Scientific Calculator Plus 991?

Scientific Calculator Plus 991 is rated higher. CASIO ClassPad averages 3.4 out of 5 from 11 ratings, while Scientific Calculator Plus 991 averages 4.7 from 13K ratings.

### Do CASIO ClassPad or Scientific Calculator Plus 991 have ads?

Scientific Calculator Plus 991 shows ads; CASIO ClassPad does not.

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

CASIO ClassPad ships an update every 7 months, and Scientific Calculator Plus 991 fortnightly. Most recently, CASIO ClassPad was updated on October 27, 2026 and Scientific Calculator Plus 991 on October 28, 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.*