# Quick Graph vs III

The clearest difference is price: Quick Graph at Free against III's $2.99. Quick Graph also leads on rating (4.6 vs 4.0) and ratings volume (423 vs 1). III's advantage is in-app purchases (none vs 2) and iOS requirement (11.0 vs 17.0). On review sentiment, ads and device support there is nothing between them.

Quick Graph is free to download; III costs $2.99 up front. Quick Graph sells 2 one-off in-app purchases. III asks for nothing beyond the download.

Quick Graph holds the better App Store score, 4.6 against 4.0. That said, the two scores are not equally well evidenced: Quick Graph has 423 ratings behind it against 1, so its average is the more settled of the two. Written reviews complicate that: 94% of Quick Graph's written reviews are positive against 100% of III's, so the app with the better star average is not the one people write more warmly about.

Quick Graph ships an update every 5 months, III every 17 months. The most recent releases landed on October 31, 2026 and November 6, 2026 respectively.

## The numbers

| Metric | Quick Graph | III |
| --- | --- | --- |
| Price | **Free** | $2.99 |
| Rating | **[4.6 (423 ratings)](https://appshunter.io/ios/app/quick-graph/id292412367/reviews)** | [4.0 (1 ratings)](https://appshunter.io/ios/app/iii-v-comp/id475184953/reviews) |
| Number of ratings | **423** | 1 |
| Positive reviews | 93.6% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 5 months** | Every 17 months |
| Monetization | **Free with in-app purchases** | Paid |
| Size | 6 MB | 10 MB |
| Requires iOS | 17.0 | **11.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [KZ Labs](https://appshunter.io/developer/1091008972) | [Takuya Ishikawa](https://appshunter.io/developer/468311118) |

## What reviewers say

### Quick Graph

[App page](https://appshunter.io/ios/app/quick-graph/id292412367)

This powerful graphing calculator leverages multitouch displays for 2D and 3D equation visualization. It supports various coordinate systems and offers features like equation editing, evaluation, and a library for storing common formulas. Advanced features are available through an in-app purchase.

**Highlights:** 2D and 3D graphing, Multiple coordinate systems, Equation evaluation, Equation library, Copy/email/save graphs, Implicit and inequality graphing (advanced)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Advanced Features | $1.99 | one-time |
| Buy Us a Coffee | $1.99 | one-time |

**What reviewers like**

- 🚀 Beautiful display
- 🚀 Quick and straightforward equations entry
- 🚀 Configurable axes and easy translation
- 👍 Wonderful and beautiful app
- 👍 Long tradition of working well

**What reviewers complain about**

- 🐛 Can't really graph polar
- 🐛 Redesign stinks
- 🐛 Few options for tablet version
- 🐛 Confusing design
- 🐛 Horrible manual

**Reported bugs**

- Crashes when trying to save to photos
- Equations not visible when projecting to external display
- Incorrect rendering of some functions like y=tan(x)*x
- Degradation in 3D plot quality when zooming out
- Equations not working as expected for simple cases like x+y=0

**Requested features**

- Display 3D surface with variable opacity or as wireframe
- Ability to define and display functions over a certain interval
- Ability to define and display parametric equations
- Ability to move cursor around within a function while typing
- Ability to animate equations with a parameter


### III

[App page](https://appshunter.io/ios/app/iii-v-comp/id475184953)

Calculate material properties for III-V compound semiconductors like AlGaInAsP. It determines compositions, lattice constant, strain, bandgap, and effective masses for InP or GaAs substrates.

**Highlights:** III-V compound semiconductor calculations, Material property determination, Composition calculation (x, y, z), Lattice constant and strain analysis, Bandgap and effective mass calculation, Supports InP and GaAs substrates

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

**In-app purchases:** none


## Frequently asked questions

### Is Quick Graph free?

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

### Is III free?

III costs $2.99, with no in-app purchases.

### Which has better reviews, Quick Graph or III?

Quick Graph is rated higher. Quick Graph averages 4.6 out of 5 from 423 ratings, while III averages 4.0 from 1 ratings.

### Do Quick Graph or III have ads?

Neither Quick Graph nor III shows ads.

### Which is updated more often, Quick Graph or III?

Quick Graph ships an update every 5 months, and III every 17 months. Most recently, Quick Graph was updated on October 31, 2026 and III 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.*