# APCA

# APCA

## This site is a live web page of the primary GitHub repo for the APCA/SAPC project. Documentation linked below.

# APCA GitHub Repo

## Welcome!

APCA is the **Accessible Perceptual Contrast Algorithm**, a new way to predict contrast for text and non-text for content on self illuminated displays.

### Questions? Ask in our Discussions Forum

This is also where we discuss draft guidelines and proposals. Please post all comments or discussions here and not in the satellite repositories so they can be tracked and resolved.

*DOCUMENTATION*

**Main Readme Doc**This page includes the math, code walkthroughs and links for developer related goodies. If you’d like to dive into the deep end, this is a good start.

*Simple Overview, QuickStart, and FAQ*

These are intended for end users, and those interested in a plain language overview without a lot of the math & theory.

**Why APCA?**A basic overview**APCA in a nutshell**The minimum user guide**APCA FAQ**

*Sciency Stuff!*

Maths! Vision Science! Photons on Parade!

- The base APCA-W3 formula in LaTeX math for your viewing and calculating pleasure.
- Regarding Exponents Is delta-gamma some kinda frat house? Nope… It’s math.
- Standard Observer Model The setting for a mathematical eyeball.
- Visual Contrast Draft Whitepaper Almost as tasty as a draft beer!

### APCA Resources, Articles, & Links

The main catalog of related articles, peer reviews, repositories, white papers, and more!

### APCA Linktree

Smaller, selected link collection.

### Myndex Research on Twitter

### Local Repo Documentation

**Why APCA:**A brief plain language overview of APCA and readability contrast.**APCA in a Nutshell:**Quick overview of levels, use cases, and font sizing.**APCA Main Documentation (READ ME):**The repo basic readme file for an overview and quickstart.**APCA Documentation Index:**An index of relevant APCA documentation.**APCA Formula 0.9.98g4g:**The repo basic readme file for an overview and quickstart.**Repo List:**A list of specific versions of APCA, Bridge PCA, and support files.**Standard Observer Model:**Draft Standard Observer.**Important Change Notices:**General Change History (see individual repos for specifics)**Regarding Exponents:**Notes on the exponents used in APCA.**Accessibility Statement:**A statement for beta testers and early adopters to use place on sites using APCA**APCA Minimum Compliance for Developers:**Standards for what can be called APCA™.**APCA FAQ:**Just starting, so few QA yet.### The SAPC APCA GitHub Main Repository

You are here 🔽 this index page is served at the github repo.

### The APCA-W3 GitHub Repo

Over there is the W3 licensed version, and it’s the same as the published npm package.

### The Bridge-PCA GitHub Repo

The BridgePCA is backwards compatible with WCAG 2, and it’s the same as the published npm package.

### The ColorParsley GitHub Repo

ColorParsley is a micro library for auto parsing color strings of all kinds, also on npm.

## APCA Contrast Calculator

The canonical demo tool at Myndex

### Bridge PCA Contrast Calculator

Try out the Bridge PCA tool at Myndex

### Myndex CVD Simulator

Color insensitive vision simulation (aka colorblind). Includes deuteranopia, protanopia, tritanopia, and blue cone monochromacy/achromatopsia.

### Myndex Perception Research

Demos and Experiments relating to the project.