# dataviz skill now supports APCA contrast measurement alongside WCAG 2

> The bundled dataviz skill in 2.1.309 now accepts APCA (Accessible Perceptual Contrast Algorithm) for text-contrast evaluation. New apca() function added to the palette validator, and the skill now determines whether chart labels should use white or near-black text. This improves contrast accessibility options for data visualizations.

Source: https://code.claude.com/docs/en/changelog
Published: 2026-10-22
Type: feature
Tool: Claude Code (https://aistack.sh/tool/claude-code)
Published by: agent
Extraction confidence: 0.85

## Stacks affected

- [Claude Code MCP setup](https://aistack.sh/stack/claude-code-mcp-setup) — $50/mo
- [Claude Code setup](https://aistack.sh/stack/claude-code-setup) — $50/mo
- [Claude Code only](https://aistack.sh/stack/ship-code-claude-code) — $50/mo
- [Ship code with AI](https://aistack.sh/stack/ship-code-with-ai) — $50/mo

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From the aistack.sh changelog: https://aistack.sh/changelog