# A Complex Calc vs Scientific Calculator 991EX

The clearest difference is in-app purchases: A Complex Calc at none against Scientific Calculator 991EX's 3. A Complex Calc also leads on update cadence (every 4 weeks vs every 2 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Scientific Calculator 991EX sells 3 in-app purchases, starting at $0.99 per month. A Complex Calc asks for nothing beyond the download.

A Complex Calc ships an update every 4 weeks, Scientific Calculator 991EX every 2 months. The most recent releases landed on October 29, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | A Complex Calc | Scientific Calculator 991EX |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (24 ratings)](https://appshunter.io/ios/app/a-complex-calc/id1372571548/reviews)** | — |
| Number of ratings | **24** | — |
| Positive reviews | 80.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 4 weeks** | Every 2 months |
| Monetization | Free | — |
| Size | 8 MB | 9 MB |
| Requires iOS | 18.0 | **17.0** |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Antonio Ruffolo](https://appshunter.io/developer/1372571547) | [Murad Yaghi](https://appshunter.io/developer/1740110475) |

## What reviewers say

### A Complex Calc

[App page](https://appshunter.io/ios/app/a-complex-calc/id1372571548)

Perform complex calculations with a modern, user-friendly interface. Offers both basic and scientific modes, including support for complex numbers and advanced functions. This lightweight application provides a history of computations and is completely free with no advertisements.

**Highlights:** Complex number support, Basic and Scientific modes, History of operations, Trigonometric and hyperbolic functions, Random number generation, Lightweight app size

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

**In-app purchases:** none


### Scientific Calculator 991EX

[App page](https://appshunter.io/ios/app/scientific-calculator-991ex/id6801710317)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Pro | $0.99 | per month |
| Yearly Pro | $4.99 | per year |
| Lifetime Pro | $14.99 | one-time |


## Frequently asked questions

### Is A Complex Calc free?

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

### Is Scientific Calculator 991EX free?

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

### Do A Complex Calc or Scientific Calculator 991EX have ads?

Neither A Complex Calc nor Scientific Calculator 991EX shows ads.

### Which is updated more often, A Complex Calc or Scientific Calculator 991EX?

A Complex Calc ships an update every 4 weeks, and Scientific Calculator 991EX every 2 months. Most recently, A Complex Calc was updated on October 29, 2026 and Scientific Calculator 991EX on October 25, 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.*