Product Design — Suite anchor

Witness

AI design critique your agents already trust.

MCP server free • Mac annotation studio coming Q4 2026

What it does

Two surfaces, one product. The MCP server gives AI coding agents (Claude Code, Cursor, Cline, Aider) the ability to critique any UI they generate — with calibrated taste from a fine-tuned vision model. The Mac annotation studio is the designer-facing review queue: queue UI iterations, capture critique, agree/disagree, build the dataset that makes the next fine-tune even better.

Capabilities

MCP server

Shipped — free

4 tools: review_ui, review_screenshot, check_accessibility, compare_designs.

vllm-mlx + Qwen3-VL-8B

Shipped

Local vision-language model serving. No cloud required.

Figma compare

Shipped

Diff a Figma design against the implemented UI.

Training pipeline

Shipped — substantial

MLX LoRA fine-tuning, dataset management, export to OpenAI/HF/ORPO.

Annotation studio

Q4 2026

Mac app for queueing UI iterations and capturing critique.

Accessibility 11 modes

Q4 2026

Color blindness, low vision, motor, cognitive constraints.

Phase 5 fine-tune

Q4 2026

First end-to-end LoRA adapter on real annotations.

FastMCP envelope

Q4 2026

Shared response shape across labsly MCP servers.

Who it's for

AI agent developers who want their agents to ship UI that's actually usable. Product designers using AI tools to generate iterations who need a structured critique loop. Teams that care about accessibility but don't have the bandwidth for manual audits.

Pricing

MCP Server

Free

Forever free. pipx install labsly-witness-mcp. Use in Claude Code, Cursor, Cline, Aider.

Mac annotation studio

$20/mo

Annotation queue, fine-tune dataset builder, accessibility 11 modes, Figma + GitHub integration. $200/yr.

Get launch updates

Occasional updates on labsly app launches. No spam, no tracking pixels. Unsubscribe anytime.