For writers

Press kit.

What 35mm.org, NegaKit and the iPhone app are, in words you can use — with the numbers behind them, and the pictures to go with them.

35mm.org

35mm.org is a reference for film photography. It lists film stocks, developers and development times, and every published time carries the datasheet it came from. Today it holds 942 films, 94 developers and kits and 8,474 published times, in English, Polish and Ukrainian.

35mm.org →

NegaKit

NegaKit is a film negative converter for the Mac that knows your film. It scans, converts and finishes rolls, and puts 35mm.org’s development times, datasheets and reciprocity data on every roll card. Its AI tools run on the Mac, so photographs never leave it.

NegaKit →

35mm.org for iPhone

The 35mm.org app puts the development calculator and a darkroom timer in a pocket, for iPhone, iPad and Apple Watch. The whole catalogue is on the phone, so it works without a signal. There is no account, no tracking and no advertising.

35mm.org for iPhone →

At a glance

Fact sheet.

The figures are counted from the catalogue when this page is opened.

35mm.org

What it is: A reference for film photography
In the reference: 942 films, 94 developers and kits, 8,474 published times
Languages: English, Polish and Ukrainian
Access: Free to read

NegaKit

What it is: A film negative converter
Platform: macOS
Latest version: 0.11.0 · 21 October 2026
Languages: English, Polish and Ukrainian

35mm.org for iPhone

What it is: A development calculator and darkroom timer
Platforms: iPhone and iPad, iOS 17 or later; Apple Watch, watchOS 10 or later
Status: Coming soon to the App Store
Languages: English; Polish and Ukrainian coming
Privacy: No account, no tracking, no ads