# MeterGlass vs ZoneCalc

The clearest difference is price: ZoneCalc at Free against MeterGlass's $9.99. MeterGlass's advantage is in-app purchases (none vs 1). On update cadence, ads, device support and iOS requirement there is nothing between them.

ZoneCalc is free to download; MeterGlass costs $9.99 up front. ZoneCalc sells 1 one-off in-app purchase. MeterGlass asks for nothing beyond the download.

Both ship on a similar rhythm, roughly every 3 weeks. The most recent releases landed on September 11, 2026 and September 9, 2026 respectively.

## The numbers

| Metric | MeterGlass | ZoneCalc |
| --- | --- | --- |
| Price | $9.99 | **Free** |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/zonecalc-zone-system-meter/id6772102746/reviews)** |
| Number of ratings | — | **2** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | Every 3 weeks |
| Monetization | — | Freemium |
| Size | 3 MB | 3 MB |
| Requires iOS | **17.0** | 17.6 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [存滨 崔](https://appshunter.io/developer/1809703940) | [Juergen Suk](https://appshunter.io/developer/6772102748) |

## What reviewers say

### MeterGlass

[App page](https://appshunter.io/ios/app/meterglass/id6761722905)

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

**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 MeterGlass free?

MeterGlass costs $9.99, with no in-app purchases.

### Is ZoneCalc free?

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

### Do MeterGlass or ZoneCalc have ads?

Neither MeterGlass nor ZoneCalc shows ads.

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

MeterGlass ships an update every 3 weeks, and ZoneCalc every 3 weeks. Most recently, MeterGlass was updated on September 11, 2026 and ZoneCalc on September 9, 2026.

---

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