# ZoneCalc vs Darkcloth

The clearest difference is in-app purchases: Darkcloth at none against ZoneCalc's 1. On price, update cadence, ads and device support there is nothing between them.

Both are free to download. ZoneCalc sells 1 one-off in-app purchase. Darkcloth asks for nothing beyond the download.

ZoneCalc ships an update every 3 weeks, Darkcloth every 10 days. The most recent releases landed on October 12, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | ZoneCalc | Darkcloth |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/zonecalc-zone-system-meter/id6772102746/reviews)** | — |
| Number of ratings | **2** | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 10 days** |
| Monetization | Freemium | — |
| Size | 3 MB | 2 MB |
| Requires iOS | 17.6 | **16.0** |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Juergen Suk](https://appshunter.io/developer/6772102748) | [LACHLAN M FYSH](https://appshunter.io/developer/6778825930) |

## What reviewers say

### 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 |


### Darkcloth

[App page](https://appshunter.io/ios/app/darkcloth/id6778825928)

**In-app purchases:** none


## Frequently asked questions

### Is ZoneCalc free?

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

### Is Darkcloth free?

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

### Do ZoneCalc or Darkcloth have ads?

Neither ZoneCalc nor Darkcloth shows ads.

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

ZoneCalc ships an update every 3 weeks, and Darkcloth every 10 days. Most recently, ZoneCalc was updated on October 12, 2026 and Darkcloth on October 14, 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.*