What is the key difference between A11y and Sem?

A11y belongs to the Developer Tools category with local stdio execution, while Sem belongs to the Developer Tools category with local stdio execution.

How do I install A11y or Sem in Claude Desktop or Cursor?

Copy the mcpServers JSON configuration snippet provided on this page into your claude_desktop_config.json or ~/.cursor/mcp.json file and restart your AI client.

Are A11y and Sem free or paid?

A11y operates under a Free / Open Source model (No auth required). Sem operates under a Free / Open Source model (No auth required).

Which MCP server has more tools and community activity?

A11y lists 4 tools with 0 views and 0 GitHub stars. Sem lists 0 tools with 1 views and 3,334 GitHub stars.

Can I use both A11y and Sem together in the same MCP host?

Yes! MCP hosts like Claude Desktop, Cursor, Windsurf, Cline, and VS Code support configuring multiple servers under the mcpServers object simultaneously.

Side-by-Side Model Context Protocol Comparison

A11y vs Sem

In-depth architectural comparison of the A11y and Sem MCP servers. Compare execution transports, security boundaries, tool capabilities, quality scores, and ready-to-paste client installation snippets for Claude, Cursor, Windsurf, and VS Code.

At a Glance & Executive Verdict

A11y

Developer Tools · Local stdio

Quality: 43/100 (Fair) | Auth: No auth required

Sem

Developer Tools · Local stdio

Quality: 49/100 (Fair) | Auth: No auth required

Verdict Summary: Choose A11y if you need specialized Developer Tools tools running via a local process. Choose Sem if your workspace requires Developer Tools integration with local subprocess execution. Both servers can be configured concurrently in your client's mcpServers manifest.

Which MCP Server Should You Choose?

Choose A11y when:

You need dedicated capabilities in the Developer Tools domain.
You prefer local stdio subprocess transport architecture.
Your security boundary fits: No auth required (Free / Open Source).
Primary tools included: alt, aria-level, aria-label.

Explore A11y Details

Choose Sem when:

You need dedicated capabilities in the Developer Tools domain.
You prefer local stdio subprocess transport architecture.
Your security boundary fits: No auth required (Free / Open Source).

Explore Sem Details

Feature & Specification Comparison

Specification	A A11y Developer Tools	Sem Developer Tools
Summary	Alt text, headings, contrast, ARIA for AI agents	Entity-level code intelligence: semantic diff, impact analysis, blame, and context for AI agents
Category & Scope	Developer Tools	Developer Tools
Quality signal

Tools & Capabilities Breakdown

A11y Tools (4)

alt

aria-level

aria-label

autocomplete

Sem Tools (0)

No explicit tool names declared in metadata yet. Check project README on main listing page.

Ready-to-Paste Client Configurations

Paste either (or both) of these JSON server blocks into your client config file (e.g. claude_desktop_config.json or ~/.cursor/mcp.json).

A11y Configuration

mcpServers (Claude Desktop / Cursor)

{
  "mcpServers": {
    "a11y": {
      "command": "npx",
      "args": [
        "-y",
        "a11y"
      ]
    }
  }
}

Sem Configuration