# PocketCAS vs functionCalculator

The clearest difference is in-app purchases: functionCalculator at none against PocketCAS's 1. functionCalculator also leads on iOS requirement (10.3 vs 18.0). PocketCAS's advantage is ads (none vs shown) and rating (4.6 vs 4.3). On price and device support there is nothing between them.

Both are free to download. PocketCAS sells 1 one-off in-app purchase. functionCalculator asks for nothing beyond the download.

PocketCAS holds the better App Store score, 4.6 against 4.3. That said, the two scores are not equally well evidenced: PocketCAS has 204 ratings behind it against 6, so its average is the more settled of the two.

PocketCAS ships an update every 3 months, functionCalculator every 11 months. The most recent releases landed on November 1, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | PocketCAS | functionCalculator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (204 ratings)](https://appshunter.io/ios/app/pocketcas-graphing-calculator/id517249689/reviews)** | [4.3 (6 ratings)](https://appshunter.io/ios/app/functioncalculator/id1275985289/reviews) |
| Number of ratings | **204** | 6 |
| Positive reviews | 90.8% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | **Every 3 months** | Every 11 months |
| Monetization | **Free** | Ad-supported |
| Size | 42 MB | 6 MB |
| Requires iOS | 18.0 | **10.3** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Timing Software GmbH](https://appshunter.io/developer/333261118) | [Jirou Fukuda](https://appshunter.io/developer/689603483) |

## What reviewers say

### PocketCAS

[App page](https://appshunter.io/ios/app/pocketcas-graphing-calculator/id517249689)

This advanced math application assists with a wide range of mathematical problems, from basic arithmetic to calculus, algebra, and statistics. It functions as a graphing calculator replacement, aids in homework, and supports complex calculations for academic and professional use.

**Highlights:** 2D and 3D plotting, Calculus functions (limits, derivatives), Linear algebra operations, Equation solving, Scripting language, Physical units and constants, iCloud sync

**Features:** Family Sharing, iPhone Duo support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PocketCAS Pro | $29.99 | one-time |

**What reviewers like**

- 👍 Intuitive and user-friendly interface
- 📊 Excellent graphing capabilities with 3D visualization
- 💰 Free version available with substantial features
- 🧮 Powerful mathematical computation engine
- 📱 Convenient mobile alternative to expensive calculators

**What reviewers complain about**

- 🐛 Recent updates cause crashes on older documents
- 💸 Expensive compared to free alternatives
- 🔒 Limited free version functionality
- 🎮 Clunky interface in some areas
- ❌ Cannot plot certain advanced functions

**Reported bugs**

- App crashes when loading previously saved documents
- Crashes with no error feedback or debugging information
- Cannot plot certain mathematical functions
- Zoom scaling issues with 3D graphs (scales Z-axis incorrectly)
- Compatibility broken with iOS 6 after iOS 7 update

**Requested features**

- Dark theme/dark mode for UI
- Multiple polynomials on single graph
- Inverse button functionality
- Better zoom functionality for 3D graphs
- Improved documentation and tutorials


### functionCalculator

[App page](https://appshunter.io/ios/app/functioncalculator/id1275985289)

This app calculates the value of mathematical functions y = f(x) for various types of numbers, including irrational ones. It displays results as exact fractions with square roots and can convert them to decimals. The app also supports calculations involving two different input values, alpha and beta.

**Highlights:** Calculate function values for any number type, Display results as exact fractions, Convert results to decimal, Perform operations on two input values, Supports irrational numbers

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is PocketCAS free?

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

### Is functionCalculator free?

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

### Which has better reviews, PocketCAS or functionCalculator?

PocketCAS is rated higher. PocketCAS averages 4.6 out of 5 from 204 ratings, while functionCalculator averages 4.3 from 6 ratings.

### Do PocketCAS or functionCalculator have ads?

functionCalculator shows ads; PocketCAS does not.

### Which is updated more often, PocketCAS or functionCalculator?

PocketCAS ships an update every 3 months, and functionCalculator every 11 months. Most recently, PocketCAS was updated on November 1, 2026 and functionCalculator on November 4, 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.*