Rodinal Stand Development Calculator

A calculator for determining adjusted development times for Rodinal stand development, with temperature modeling and optional fridge cooling simulation.

Features

• Preset dilutions (1+50 / 1+100) or custom baseline times
• Temperature-adjusted development times using an exponential rate model
• Fridge cooling simulation using Newton's law of cooling
• Real-time chart showing temperature decay and 20°C-equivalent development progress
• Risk assessment for your temperature and dilution combination
• Temperature units: °C, °F, K
• Dark mode
• Export results as a PNG image

Usage

1. Set baseline time — pick a preset dilution (1+50 = 30 min, 1+100 = 60 min) or type any custom time in minutes
2. Enter your developer temperature — switch units with the °C / °F / K toggle in the header
3. Optionally enable fridge cooling — models the tank cooling toward 4°C with a 30-minute time constant
4. Read the result — the calculated development time, average and final temperatures, and a risk badge are shown immediately
5. Export — click the Export button to save the result card as a PNG

Getting Started

Prerequisites

• Node.js 16+

Scripts

npm install          # install dependencies
npm run dev          # start Vite dev server with hot reload
npm run build        # production build to dist/
npm run preview      # serve the production build locally

Analytics

Privacy-friendly analytics via Plausible. The following custom events are tracked:

Event	Trigger	Props
Temperature Changed	User changes the temperature input	value, unit
Time Changed	User changes the baseline time input	value
Unit Changed	User switches temperature unit (°C/°F/K)	unit
Export Clicked	User presses the Export button	temperature, unit, time

Each event must have a matching custom event goal created in the Plausible dashboard to appear in reports.

Tech Stack

• React 19 / Vite
• Tailwind CSS
• Recharts
• Lucide React
• html-to-image