Darkroom Toolkit
Film Developing & Formulas
Only for iPhone
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.
iPhone
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: official processes, recipes, and all calculators included
• Lifetime Pro unlock ($9.99) 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 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.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Improved f-Stop Printing calculator: new toggle for switching between exposure times and the difference from your base – handy for test strips.
The developer, Robert House, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Linked to You
The following data may be collected and linked to your identity:
- Purchases
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Contact Info
- Identifiers
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Robert House
- Size
- 61.9 MB
- Category
- Photo & Video
- Compatibility
Requires iOS 16.4 or later.
- iPhone
Requires iOS 16.4 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Darkroom Toolkit Pro $9.99
- Copyright
- © 2025 Robert House