ContrastKit
WCAG color contrast checks, nearest accessible color, CSS color conversion and palette pair checks.
What it does
ContrastKit is an MCP server, a connector that lets an AI assistant use it as a tool. It is hosted: an assistant connects to it over the internet, nothing to install.
No capability identified yet from its description.
Facts come from the Official MCP Registry, as declared by the publisher. Capabilities are matched automatically (low confidence) and are not a test of the tool.
At a glance
How to connect
As declared in the Official MCP Registry · hosted endpoint tested by Electra Index 1h ago (live check)Hosted endpoint
https://contrastkit.mike-tusa.workers.dev/mcpstreamable-http
In Claude Code: claude mcp add --transport http contrastkit https://contrastkit.mike-tusa.workers.dev/mcp
MCP settings (Claude Desktop, Cursor and other MCP clients)
{
"mcpServers": {
"contrastkit": {
"url": "https://contrastkit.mike-tusa.workers.dev/mcp"
}
}
}Live check
Electra Index connected to the hosted endpoint 1h agoONLINE ContrastKit answered an MCP connection on 22 Oct 2026 and introduced itself as contrastkit 0.1.0 (MCP protocol 2025-06-18).
4 tools offered to AI assistants
check_contrast· Compute the WCAG 2.x contrast ratio between a text (foreground) color and a background color, with pass/fail for AA, AA large text, AAA, AAA large text and non-text UI (3:1). Handles translucent colors. Read-only. Same engine as GET /api/cosuggest_accessible_color· For a failing color pair, find the closest color (same hue and saturation, lightness changed as little as possible) that meets the chosen WCAG level. Adjust the foreground (default), the background, or both (best first). Read-only. Same engconvert_color· Convert a CSS color to hex, rgb() and hsl(), with its relative luminance, its contrast on white and on black, and the better text color (black or white) to put on it. Read-only. Same engine as GET /api/convert.check_palette· Contrast ratio for every pair of 2 to 12 colors (up to 66 pairs), highest first, each flagged against the chosen WCAG level. Use it to see which brand colors can be used together for text. Read-only. Same engine as GET /api/palette.
What "online" means: the server answered an MCP connection at the time of the check. It is not a guarantee of security, quality or continuous uptime. How we test: we open an MCP session and ask for the tool list, as an AI assistant would. We never run a tool and never send a key. Checked every few days. Method
Facts & evidence
Each fact shows where it was seen and when.| Fact | Value | Evidence | Source | Last confirmed |
|---|---|---|---|---|
| Hosted endpoint | https://contrastkit.mike-tusa.workers.dev/mcp | DECLARED | SRC-001 Official MCP Registry | 2h ago |
| Local install (package) | no | DECLARED | SRC-001 Official MCP Registry | 2h ago |
| Remote access (hosted) | yes | DECLARED | SRC-001 Official MCP Registry | 2h ago |
| Website | https://contrastkit.mike-tusa.workers.dev/ | DECLARED | SRC-001 Official MCP Registry | 2h ago |
| Registry status | active | DECLARED | SRC-001 Official MCP Registry | 2h ago |
| Version | 0.1.0 | DECLARED | SRC-001 Official MCP Registry | 2h ago |
| MCP server | yes | DECLARED | SRC-001 Official MCP Registry | 2h ago |
Change history
- NEW22 Oct 2026first seen in the index
Is this page accurate?
Flag it and our robot re-checks the official source. Reports never change a score.Is ContrastKit still online?
Free alerts · no accountQuestions about ContrastKit
How do I connect ContrastKit?
Use the hosted endpoint https://contrastkit.mike-tusa.workers.dev/mcp in your assistant's MCP settings. The exact settings are in "How to connect" above, as declared in the Official MCP Registry.
What tools does ContrastKit offer?
When Electra Index connected on 22 Oct 2026, it listed 4 tools: check_contrast, suggest_accessible_color, convert_color, check_palette. The full list is in "Live check" above.
Is ContrastKit online?
Yes. Its hosted endpoint answered an MCP connection from Electra Index 1h ago.