# COLT 4 vs LuxTest

The clearest difference is price: COLT 4 at Free against LuxTest's $0.99. On update cadence, ads, in-app purchases and device support there is nothing between them.

COLT 4 is free to download; LuxTest costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Both ship on a similar rhythm, roughly monthly. The most recent releases landed on October 5, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | COLT 4 | LuxTest |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Monthly | Monthly |
| Size | 155 MB | 35 MB |
| Requires iOS | **15.0** | 15.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Straightpoint](https://appshunter.io/developer/1232597225) | [晓燕 王](https://appshunter.io/developer/1891891243) |

## What reviewers say

### COLT 4

[App page](https://appshunter.io/ios/app/colt-4/id6736948101)

**Features:** macOS Compatibility

**In-app purchases:** none


### LuxTest

[App page](https://appshunter.io/ios/app/luxtest-study-light-meter/id6761891597)

**In-app purchases:** none


## Frequently asked questions

### Is COLT 4 free?

COLT 4 is free to download, with no in-app purchases.

### Is LuxTest free?

LuxTest costs $0.99, with no in-app purchases.

### Do COLT 4 or LuxTest have ads?

Neither COLT 4 nor LuxTest shows ads.

### Which is updated more often, COLT 4 or LuxTest?

COLT 4 ships an update monthly, and LuxTest monthly. Most recently, COLT 4 was updated on October 5, 2026 and LuxTest on October 2, 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.*