# ColourWorker — Spectral measurement on phones

> Spectral measurement on phones (iPhone/iPad app by Miguel Garvie.)

- Source: https://appshunter.io/ios/app/colourworker/id1561852001 (this page in markdown: same URL + `.md`)
- Developer: [Miguel Garvie](https://appshunter.io/developer/1545547691)
- Category: Utilities
- Price: Free
- Age rating: 4+
- Requires: iOS 13.2 · 10 MB
- Languages: American English
- Released: 2024-12-02
- Data updated: 2026-05-17
- User reviews in markdown: https://appshunter.io/ios/app/colourworker/id1561852001/reviews.md

## What is ColourWorker?

In general it is not possible to make accurate colorimetric and spectral measurements in conventional photographic images for two main reasons. First because variation in illumination spectra cannot be discounted, and second because the number of degrees of freedom in reflectance spectra is potentially much greater than the three provided by camera RGB signals. Consequently, colorimetry requires either spectrometers or multi- and hyper-spectral imaging, which are costly and inconvenient. ColourWorker uses automatic calibration and statistical modelling to improve the accuracy of color measurement in photographic images. This app implements ColourWorker technology on iOS. It allows users to select application areas, to take a photograph with a calibration standard, and returns estimated an average  L*a*b* colorimetric value and for pixels in a defined region of the image along with a plot of the reflectance spectrum.


## Version history (last 4 releases)

### 1.5 — 2025-12-20

This version uses a 1-1-3-1-1 QR pattern for the colour standard.

### 1.4 — 2025-08-01

The app now crops the image to the contents within the QR patterns found in the standard.

### 1.2 — 2024-12-09

Bug fixes

### 1.0 — 2024-12-02

No release notes.

## Apps similar to ColourWorker

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Eyesense Training](https://appshunter.io/ios/app/eyesense-training/id6747746284) | — | Free | Utilities |
| [Bubble Level: AR, Angle Finder](https://appshunter.io/ios/app/bubble-level-ar-angle-finder/id1594066382) | 4.5 (662) | Free | Utilities |
| [Fonts & Emoji Keyboard.](https://appshunter.io/ios/app/fonts-and-emoji-keyboard/id1548692585) | 4.4 (13,269) | Free | Utilities |
| [Drop Files - Air Share](https://appshunter.io/ios/app/drop-files-air-share/id1637951877) | 4.0 (310) | Free | Utilities |
| [Wolow - Wake on LAN](https://appshunter.io/ios/app/wolow-wake-on-lan/id1500970060) | 4.3 (1,306) | Free | Utilities |
| [Control Samsung Smart TV](https://appshunter.io/ios/app/control-samsung-smart-tv/id6504771440) | 4.4 (225) | Free | Utilities |

## More apps by Miguel Garvie

- [CoverMatch](https://appshunter.io/ios/app/covermatch/id1545547689)
- [PhotoFolia](https://appshunter.io/ios/app/photofolia/id6463719098)

All apps by Miguel Garvie: https://appshunter.io/developer/1545547691

---

*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-05-17.*