Calque vs v0

Calque is a free, MIT-licensed tool that turns a PNG or JPEG website screenshot into HTML and CSS by measuring pixels. It can produce a self-contained HTML file or JSON measurements, including colors, type scale, weights, spacing, container width, gutters, and corner radii. It also identifies sections, columns, cards, buttons, alignment, and reading order, and can reconstruct vertical gradients. With the assets option, it crops photographs from the screenshot for use in the output. Its check command renders the result in an installed Chrome-family browser and compares it pixel by pixel with the screenshot. Calque is packaged as a Claude skill that provides measurements for Claude to use when writing project code. The documented workflow uses Tesseract for OCR; Docker is optional. The maker says it makes no model call or API request and works offline after OCR data is cached. It handles one screenshot, not a whole site, and cannot identify an exact typeface. Icons become placeholders, and photo crops retain screenshot resolution and any overlaid text.

v0 is an AI agent for creating code, full-stack applications and other agents. Users can prompt it to build or refine projects, then deploy them to production or open a pull request for review. Documented project types include landing pages, dashboards, ecommerce stores, AI apps and full-stack applications. Design Mode provides visual controls and a live preview. In GitHub-connected chats, v0 creates a working branch and commits changes, but does not push directly to main. Previews run in isolated Vercel Sandbox environments that support server-side features such as API routes and databases. Its stated technology includes Next.js, React, TypeScript, Tailwind CSS and shadcn/ui. Integration topics include GitHub, Vercel, databases, Snowflake, Shopify, external APIs, MCP integrations and Slack. v0 is available on the web, iOS and API. The Free plan costs nothing and includes seven messages per day, Vercel deployment, Design Mode and GitHub sync. Plus is billed at $30/user/month; Business at $100/user/month.