# GrayZone vs ZoneCalc

The clearest difference is price: ZoneCalc at Free against GrayZone's $2.99. ZoneCalc also leads on rating (5.0 vs 2.8). GrayZone's advantage is in-app purchases (none vs 1) and update cadence (weekly vs every 3 weeks). On ratings volume, ads, device support and iOS requirement there is nothing between them.

ZoneCalc is free to download; GrayZone costs $2.99 up front. ZoneCalc sells 1 one-off in-app purchase. GrayZone asks for nothing beyond the download.

ZoneCalc holds the better App Store score, 5.0 against 2.8. Both are backed by a comparable volume of ratings — 5 and 2 respectively.

GrayZone ships an update weekly, ZoneCalc every 3 weeks. The most recent releases landed on October 8, 2026 and September 26, 2026 respectively.

## The numbers

| Metric | GrayZone | ZoneCalc |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | [2.8 (5 ratings)](https://appshunter.io/ios/app/grayzone-light-meter/id6757147623/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/zonecalc-zone-system-meter/id6772102746/reviews)** |
| Number of ratings | **5** | 2 |
| Positive reviews | 62.5% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Weekly** | Every 3 weeks |
| Monetization | Paid | **Freemium** |
| Size | 3 MB | 3 MB |
| Requires iOS | 18.6 | **17.6** |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Massimiliano Schenetti](https://appshunter.io/developer/1864870280) | [Juergen Suk](https://appshunter.io/developer/6772102748) |

## What reviewers say

### GrayZone

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

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


### ZoneCalc

[App page](https://appshunter.io/ios/app/zonecalc-zone-system-meter/id6772102746)

This app assists photographers in precisely calculating exposure and tonal placement using Ansel Adams' Zone System. It offers features for metering, reciprocity correction, and development adjustments, with options for multi-point measurements and data export.

**Highlights:** Zone System exposure calculation, Multi-point metering, Reciprocity correction, Development adjustment recommendations, Film-specific development times, Calculation history and export

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ZoneCalc Pro | $3.99 | one-time |


## Frequently asked questions

### Is GrayZone free?

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

### Is ZoneCalc free?

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

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

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

### Do GrayZone or ZoneCalc have ads?

Neither GrayZone nor ZoneCalc shows ads.

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

GrayZone ships an update weekly, and ZoneCalc every 3 weeks. Most recently, GrayZone was updated on October 8, 2026 and ZoneCalc on September 26, 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.*