# Darkroom Toolkit — Film Developing & Formulas

> Film Developing & Formulas (iPhone/iPad app by Robert House.)

- Source: https://appshunter.io/ios/app/darkroom-toolkit/id6742162804 (this page in markdown: same URL + `.md`)
- Developer: [Robert House](https://appshunter.io/developer/1797182923)
- Category: Photo & Video, Utilities
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 16.4 · 60 MB
- Languages: American English
- Released: 2026-05-06
- Data updated: 2026-07-20
- User reviews in markdown: https://appshunter.io/ios/app/darkroom-toolkit/id6742162804/reviews.md

## What is Darkroom Toolkit?

Process film and print in the darkroom, without the math.

Darkroom Toolkit is a reference library and set of utilities for film processing and darkroom printing. Browse hundreds of photochemistry formulas, run step-by-step development timers with official manufacturer dev times, and handle common calculations – all in one app.

WHY DARKROOM TOOLKIT?
• One app instead of separate dev chart, formula, and printing calculator apps
• Primary features are free: all darkroom chemistry formulas, official processes, and calculators included
• Lifetime Pro unlock for saving favorites, custom workflows, and to support the project

FILM DEVELOPING
• Pre-configured timers for manufacturer-recommended film + developer combinations
• Multi-step processing with optional audio alerts
• iOS Live Activity: see your timer on the lock screen
• Low light / safelight theme for working in the dark

FORMULAS & CHEMISTRY
• Extensive darkroom cookbook: developers, toners, lith, alt process, and more
• Enter your target volume and every ingredient amount scales automatically
• Dilution and solution strength conversion utilities

DARKROOM PRINTING
• f-Stop printing calculator: exposure sequences and test strip times
• Print resizing calculator: new exposure times when changing print size

PRO FEATURES (one-time purchase)
• Save favorite processes and formulas
• Create and edit custom recipes and processing timers
• Sync your workflows across devices

Whether you're developing your first roll of black and white film, mixing chemistry for cyanotype, or dialing in enlarger exposures, Darkroom Toolkit keeps you consistent.

Download free. Upgrade once, yours forever.

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Darkroom Toolkit Pro | $9.99 | one-time |



## Version history (last 5 releases)

### 1.1.3 — 2026-07-10

Faster startup
Improved error handling
New environmentally friendly versions of common formulas  like Dektol and D-76

### 1.1.2 — 2026-06-26

New agitation indicator + audio cue for all processing timers. 
Pro custom processes now include editable agitation schemes.

### 1.1.1 — 2026-06-13

New links for sending us feedback or reviewing the app added to settings.

### 1.1.0 — 2026-06-10

Revamped Live Activity for tracking the progress of a process timer from the lock screen or dynamic island.

### 1.0.9 — 2026-05-27

Improved f-Stop Printing calculator: new toggle for switching between exposure times and the difference from your base – handy for test strips.

## Related topics

[darkroom formulas](https://appshunter.io/ios/topics/darkroom-formulas)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-07-20.*