# SlowLightMeter vs GrayZone

The clearest difference is price: SlowLightMeter at Free against GrayZone's $2.99. SlowLightMeter also leads on rating (5.0 vs 2.8) and review sentiment (100% vs 63%). GrayZone's advantage is chart position (#180 vs unranked). On ratings volume, update cadence, ads and in-app purchases there is nothing between them.

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

SlowLightMeter holds the better App Store score, 5.0 against 2.8. Both are backed by a comparable volume of ratings — 2 and 5 respectively. Written reviews point the same way: 100% of SlowLightMeter's written reviews are positive against 63% of GrayZone's.

SlowLightMeter ships an update every 4 days, GrayZone weekly. The most recent releases landed on September 18, 2026 and September 22, 2026 respectively.

## The numbers

| Metric | SlowLightMeter | GrayZone |
| --- | --- | --- |
| Price | **Free** | $2.99 |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/slowlightmeter/id6751812869/reviews)** | [2.8 (5 ratings)](https://appshunter.io/ios/app/grayzone-light-meter/id6757147623/reviews) |
| Number of ratings | 2 | **5** |
| Positive reviews | **100.0% of reviews** | 62.5% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 days** | Weekly |
| Monetization | **Free** | Paid |
| Best chart rank | — | **#180** |
| Size | 1 MB | 3 MB |
| Requires iOS | **15.6** | 18.6 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Ari Jaaksi](https://appshunter.io/developer/1770069317) | [Massimiliano Schenetti](https://appshunter.io/developer/1864870280) |

## What reviewers say

### SlowLightMeter

[App page](https://appshunter.io/ios/app/slowlightmeter/id6751812869)

This app provides a simple and accurate light meter for film photographers. It continuously measures light with minimal interaction and includes an ISO lock to prevent accidental changes. EV values are a core feature for ease of use.

**Highlights:** Reflective and incident light metering, Continuous light measurement, ISO lock, EV value display, Simple interface

**Features:** macOS Compatibility

**In-app purchases:** none


### GrayZone

[App page](https://appshunter.io/ios/app/grayzone-light-meter/id6757147623)

**Currently charting:** #180 Top Paid · Photo & Video (US App Store)

This app acts as a precise light meter for photographers, allowing you to measure light in specific areas of your scene. It helps achieve consistent exposure and accurate tonal representation, especially in challenging lighting conditions.

**Highlights:** Zone System Mode for tonal analysis, Real SPOT metering for selected areas, Direct exposure control with ISO, shutter speed, and aperture, Live preview with native sensor ratio, UI color inversion option, No ads or data collection

**In-app purchases:** none


## Frequently asked questions

### Is SlowLightMeter free?

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

### Is GrayZone free?

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

### Which has better reviews, SlowLightMeter or GrayZone?

SlowLightMeter is rated higher. SlowLightMeter averages 5.0 out of 5 from 2 ratings, while GrayZone averages 2.8 from 5 ratings.

### Do SlowLightMeter or GrayZone have ads?

Neither SlowLightMeter nor GrayZone shows ads.

### Which is updated more often, SlowLightMeter or GrayZone?

SlowLightMeter ships an update every 4 days, and GrayZone weekly. Most recently, SlowLightMeter was updated on September 18, 2026 and GrayZone on September 22, 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.*