# Graphing Projects vs ChromaKeys

The clearest difference is price: ChromaKeys at Free against Graphing Projects's $1.99. ChromaKeys also leads on update cadence (monthly vs every 9 months) and iOS requirement (13.0 vs 15.6). Graphing Projects's advantage is in-app purchases (none vs 2). On ads and device support there is nothing between them.

ChromaKeys is free to download; Graphing Projects costs $1.99 up front. ChromaKeys sells 2 in-app purchases, starting at $4.99 per month. Graphing Projects asks for nothing beyond the download.

Graphing Projects ships an update every 9 months, ChromaKeys monthly. The most recent releases landed on September 27, 2026 and September 15, 2026 respectively.

## The numbers

| Metric | Graphing Projects | ChromaKeys |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | — | **[5.0 (3 ratings)](https://appshunter.io/ios/app/chromakeys/id6670215800/reviews)** |
| Number of ratings | — | **3** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 9 months | **Monthly** |
| Monetization | — | Subscription |
| Size | 22 MB | 54 MB |
| Requires iOS | 15.6 | **13.0** |
| Devices | iPad, Mac | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Ventura Educational Systems](https://appshunter.io/developer/371324172) | [Deliver Software, LLC](https://appshunter.io/developer/1765347444) |

## What reviewers say

### Graphing Projects

[App page](https://appshunter.io/ios/app/graphing-projects/id1493889599)

**In-app purchases:** none


### ChromaKeys

[App page](https://appshunter.io/ios/app/chromakeys/id6670215800)

This app uses a Japanese-inspired method to teach children musical pitch through interactive lessons and games. It aims to help kids develop perfect pitch, enhancing their ability to understand music as a language. Features include personalized plans, progress tracking, and engaging challenges.

**Highlights:** Interactive music pitch lessons, Japanese ear training approach, Develops perfect pitch, Personalized lesson plans, Progress tracking, Engaging challenges

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ChromaKeys Monthly | $4.99 | per month |
| ChromaKeys Annual Subscription | $49.99 | per year |


## Frequently asked questions

### Is Graphing Projects free?

Graphing Projects costs $1.99, with no in-app purchases.

### Is ChromaKeys free?

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

### Do Graphing Projects or ChromaKeys have ads?

Neither Graphing Projects nor ChromaKeys shows ads.

### Which is updated more often, Graphing Projects or ChromaKeys?

Graphing Projects ships an update every 9 months, and ChromaKeys monthly. Most recently, Graphing Projects was updated on September 27, 2026 and ChromaKeys on September 15, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*