# Darkroom Formulas vs Zone System

The clearest difference is review sentiment: Zone System at 100% against Darkroom Formulas's 29%. Zone System also leads on rating (5.0 vs 2.5) and update cadence (every 9 days vs every 14 months). Darkroom Formulas's advantage is chart position (#200 vs unranked) and iOS requirement (9.0 vs 17). On ratings volume, ads, in-app purchases and monetization model there is nothing between them.

Darkroom Formulas costs $5.99 and Zone System $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Zone System holds the better App Store score, 5.0 against 2.5. Both are backed by a comparable volume of ratings — 4 and 3 respectively. Written reviews point the same way: 29% of Darkroom Formulas's written reviews are positive against 100% of Zone System's.

Darkroom Formulas ships an update every 14 months, Zone System every 9 days. The most recent releases landed on November 1, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Darkroom Formulas | Zone System |
| --- | --- | --- |
| Price | $5.99 | **$1.99** |
| Rating | [2.5 (4 ratings)](https://appshunter.io/ios/app/darkroom-formulas/id807461207/reviews) | **[5.0 (3 ratings)](https://appshunter.io/ios/app/zone-system/id6741873549/reviews)** |
| Number of ratings | **4** | 3 |
| Positive reviews | 28.6% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 14 months | **Every 9 days** |
| Monetization | Paid | Paid |
| Best chart rank | **#200** | — |
| Size | 2 MB | 12 MB |
| Requires iOS | **9.0** | 17 |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, Apple Watch, Vision Pro** |
| Age rating | 4+ | 4+ |
| Developer | [Freestyle Photo & Imaging](https://appshunter.io/developer/1786429988) | [Davin Nguyen](https://appshunter.io/developer/1680398335) |

## What reviewers say

### Darkroom Formulas

[App page](https://appshunter.io/ios/app/darkroom-formulas/id807461207)

**Currently charting:** #200 Top Paid · Photo & Video (US App Store)

This app provides a digital cookbook of over 160 chemical formulas for darkroom photography. It features a volume mixer for easy proportional adjustments and allows users to save, edit, and share their own recipes. Access all data offline, making it a convenient tool for photographers.

**Highlights:** 160+ chemical formulas, Custom formula editing, Proportional volume mixer, Offline access, Formula export and backup, Supports multiple units

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

**In-app purchases:** none


### Zone System

[App page](https://appshunter.io/ios/app/zone-system/id6741873549)

This tool simplifies Ansel Adams' exposure and development method for photographers. It helps measure shadows and highlights, calculate aperture and development times, and preview results with film stock presets.

**Highlights:** Measure shadows and highlights, Aperture and development calculations, Preview results with film presets, ISO and EV calculations, Simplified Zone System application

**Features:** macOS Compatibility, Apple Watch app

**In-app purchases:** none


## Frequently asked questions

### Is Darkroom Formulas free?

Darkroom Formulas costs $5.99, with no in-app purchases.

### Is Zone System free?

Zone System costs $1.99, with no in-app purchases.

### Which has better reviews, Darkroom Formulas or Zone System?

Zone System is rated higher. Darkroom Formulas averages 2.5 out of 5 from 4 ratings, while Zone System averages 5.0 from 3 ratings.

### Do Darkroom Formulas or Zone System have ads?

Neither Darkroom Formulas nor Zone System shows ads.

### Which is updated more often, Darkroom Formulas or Zone System?

Darkroom Formulas ships an update every 14 months, and Zone System every 9 days. Most recently, Darkroom Formulas was updated on November 1, 2026 and Zone System on October 30, 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.*