# Kelvin vs PhoMeter

The clearest difference is in-app purchases: PhoMeter at none against Kelvin's 2. PhoMeter also leads on update cadence (every 4 days vs every 4 months). Kelvin's advantage is iOS requirement (13.0 vs 26.4). On price, ads and device support there is nothing between them.

Both are free to download. Kelvin sells 2 in-app purchases, starting at $12.99 per year. PhoMeter asks for nothing beyond the download.

Kelvin ships an update every 4 months, PhoMeter every 4 days. The most recent releases landed on November 6, 2026 and November 9, 2026 respectively.

## The numbers

| Metric | Kelvin | PhoMeter |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.0 (1 ratings)](https://appshunter.io/ios/app/kelvin-color-temp-meter/id6748470516/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 4 days** |
| Monetization | Freemium | — |
| Size | 35 MB | 7 MB |
| Requires iOS | **13.0** | 26.4 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Christian Vergara](https://appshunter.io/developer/1648792589) | [Andrea Biancat](https://appshunter.io/developer/1593009801) |

## What reviewers say

### Kelvin

[App page](https://appshunter.io/ios/app/kelvin-color-temp-meter/id6748470516)

This app measures real-time color temperature using your device's camera white balance sensor, eliminating the need for gray cards. It offers features like a gel calculator, color history logging, and white balance lock for accurate light source matching.

**Highlights:** Real-time color temperature measurement, Uses camera white balance sensor, Gel calculator for CTO/CTB, Color history logging, White balance lock, Accurate light source matching

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Kelvin Meter Pro | $12.99 | per year |
| Kelvin Meter Pro (Lifetime) | $49.99 | one-time |


### PhoMeter

[App page](https://appshunter.io/ios/app/phometer/id6766316130)

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

**In-app purchases:** none


## Frequently asked questions

### Is Kelvin free?

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

### Is PhoMeter free?

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

### Do Kelvin or PhoMeter have ads?

Neither Kelvin nor PhoMeter shows ads.

### Which is updated more often, Kelvin or PhoMeter?

Kelvin ships an update every 4 months, and PhoMeter every 4 days. Most recently, Kelvin was updated on November 6, 2026 and PhoMeter on November 9, 2026.

---

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