# Scientific Calculator Plus 991 vs Microtech

The clearest difference is ads: Microtech at none against Scientific Calculator Plus 991's shown. Microtech also leads on rating (5.0 vs 4.7) and iOS requirement (13.0 vs 15). Scientific Calculator Plus 991's advantage is ratings volume (13K vs 1). On price, in-app purchases, monetization model 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 and Microtech sells 10 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

Microtech holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: Scientific Calculator Plus 991 has 13K ratings behind it against 1, so its average is the more settled of the two.

## The numbers

| Metric | Scientific Calculator Plus 991 | Microtech |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.7 (13K ratings)](https://appshunter.io/ios/app/scientific-calculator-plus-991/id1449106995/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/microtech/id6760429150/reviews)** |
| Number of ratings | **13K** | 1 |
| Positive reviews | 91.7% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 2 weeks | — |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 208 MB | 99 MB |
| Requires iOS | 15 | **13.0** |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad, iPod |
| Age rating | 12+ | 4+ |
| Developer | [Tran Duy](https://appshunter.io/developer/1449106994) | [Moafak Mosaly](https://appshunter.io/developer/1753462799) |

## What reviewers say

### 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


### Microtech

[App page](https://appshunter.io/ios/app/microtech/id6760429150)

A specialized training platform offering professional programs in engineering, IT, occupational safety, and the oil and gas sector. Courses are supervised by internationally accredited trainers.

**Highlights:** Professional training programs, Engineering courses, Information technology courses, Occupational safety training, Oil and gas sector programs, Internationally accredited trainers

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

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Occupational Health and | $1.00 | one-time |
| Fire Fighter Course | $50.00 | one-time |
| Basic Root Cause Analysis | $50.00 | one-time |
| osha-30-general-industry | $100.00 | one-time |
| Rigger Course: Safe Lifting | $100.00 | one-time |
| Quantity Takeoff Course: | $150.00 | one-time |
| iosh managing safely | $150.00 | one-time |
| Course 48 | $150.00 | one-time |
| Train-the-Trainer (TOT) | $200.00 | one-time |
| Introduction to Project | $250.00 | one-time |


## Frequently asked questions

### Is Scientific Calculator Plus 991 free?

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

### Is Microtech free?

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

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

Microtech is rated higher. Scientific Calculator Plus 991 averages 4.7 out of 5 from 13K ratings, while Microtech averages 5.0 from 1 ratings.

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

Scientific Calculator Plus 991 shows ads; Microtech does not.

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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.*