Design Constraint Validator vs Manzanas

In-depth architectural comparison of the Design Constraint Validator and Manzanas 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.

Which MCP Server Should You Choose?

Choose Design Constraint Validator when:

• You need dedicated capabilities in the Browser Automation domain.
• You prefer local stdio subprocess transport architecture.
• Your security boundary fits: No auth required (Free / Open Source).
• Primary tools included: WCAG text-contrast and perceptual lightness validation, Order/monotonicity checks for typography and spacing scales, Threshold and cross-axis policy checks.

Explore Design Constraint Validator Details

Choose Manzanas when:

• You need dedicated capabilities in the Browser Automation domain.
• You prefer local stdio subprocess transport architecture.
• Your security boundary fits: No auth required (Free / Open Source).
• Primary tools included: Accessibility-based UI inspection and interaction, TTL leases with FIFO queuing, Warm simulator park and thaw.

Feature & Specification Comparison

Specification	Design Constraint Validator Browser Automation	Manzanas VerifiedBrowser Automation
Summary	Validate design tokens for accessibility, scales, and design-system constraint consistency.	Drive iOS simulators from Claude Code, Cursor or Codex by accessibility label instead of screenshot-and-tap-coordinates. Exposes ui_tree, tap_element, type_into_element, wait_for_element and scroll_to_element, and every action reports whether the UI actually changed. A Mac daemon underneath hands out simulators as TTL leases with a queue and keeps a SIGSTOP warm pool, so a lease gets a live simulator in about 0.28s instead of a 7s cold boot, and multiple agents can share one Mac without colliding. Open source, MIT.

Tools & Capabilities Breakdown

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).

{
  "mcpServers": {
    "design-constraint-validator": {
      "command": "npx",
      "args": [
        "-y",
        "design-constraint-validator"
      ]
    }
  }
}

{
  "mcpServers": {
    "manzanas": {
      "command": "npx",
      "args": [
        "-y",
        "manzanasd-client@latest"
      ]
    }
  }
}

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