# Polytropic Pro vs Light Meter Pro

The clearest difference is price: Polytropic Pro at Free against Light Meter Pro's $2.99. Polytropic Pro also leads on iOS requirement (14.2 vs 17.0). Light Meter Pro's advantage is update cadence (every 3 weeks vs every 3 months). On ads, in-app purchases and device support there is nothing between them.

Polytropic Pro is free to download; Light Meter Pro costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Polytropic Pro ships an update every 3 months, Light Meter Pro every 3 weeks. The most recent releases landed on November 3, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Polytropic Pro | Light Meter Pro |
| --- | --- | --- |
| Price | **Free** | $2.99 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 3 weeks** |
| Size | 251 MB | 16 MB |
| Requires iOS | **14.2** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Polytropic](https://appshunter.io/developer/1613713281) | [Guangzhou Ciyou Network Technology Co., Ltd.](https://appshunter.io/developer/6776298572) |

## What reviewers say

### Polytropic Pro

[App page](https://appshunter.io/ios/app/polytropic-pro/id6452721348)

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

**In-app purchases:** none


### Light Meter Pro

[App page](https://appshunter.io/ios/app/light-meter-pro-lux-measure/id6777116706)

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

**In-app purchases:** none


## Frequently asked questions

### Is Polytropic Pro free?

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

### Is Light Meter Pro free?

Light Meter Pro costs $2.99, with no in-app purchases.

### Do Polytropic Pro or Light Meter Pro have ads?

Neither Polytropic Pro nor Light Meter Pro shows ads.

### Which is updated more often, Polytropic Pro or Light Meter Pro?

Polytropic Pro ships an update every 3 months, and Light Meter Pro every 3 weeks. Most recently, Polytropic Pro was updated on November 3, 2026 and Light Meter Pro on October 31, 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.*