# C vs ColorGrail

The clearest difference is price: ColorGrail at Free against C's $2.99. ColorGrail also leads on update cadence (every 2 months vs every 14 months). C's advantage is iOS requirement (13.0 vs 16.0). On ads, in-app purchases and device support there is nothing between them.

ColorGrail is free to download; C costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

C ships an update every 14 months, ColorGrail every 2 months. Both last shipped on September 15, 2026.

## The numbers

| Metric | C | ColorGrail |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | **[1.0 (1 ratings)](https://appshunter.io/ios/app/c-measure/id397314427/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 14 months | **Every 2 months** |
| Monetization | Paid | — |
| Size | 4 MB | 430 MB |
| Requires iOS | **13.0** | 16.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [alpha prompt co.,ltd.](https://appshunter.io/developer/391698490) | [Color Grail Research](https://appshunter.io/developer/1263519959) |

## What reviewers say

### C

[App page](https://appshunter.io/ios/app/c-measure/id397314427)

This app analyzes photographs to display the color of any point in XYZ and L*a*b* color spaces. It also allows for measuring the distance between two colors within the L*a*b* color space. Calibration options are available for matching camera characteristics and photography environments.

**Highlights:** Color measurement in XYZ and L*a*b*, Distance measurement between colors, Camera characteristic adjustment, Photography environment calibration, Color checker calibration

**Features:** macOS Compatibility

**In-app purchases:** none


### ColorGrail

[App page](https://appshunter.io/ios/app/colorgrail/id1263519960)

**In-app purchases:** none


## Frequently asked questions

### Is C free?

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

### Is ColorGrail free?

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

### Do C or ColorGrail have ads?

Neither C nor ColorGrail shows ads.

### Which is updated more often, C or ColorGrail?

C ships an update every 14 months, and ColorGrail every 2 months. Most recently, C was updated on September 15, 2026 and ColorGrail 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.*