Rendercheck MCP server

RenderCheck

Assert the text users actually see, not just what is in the DOM. RenderCheck takes a screenshot in your Playwright or Cypress test, reads it with OCR on your machine, and fails the test when the rendered text is wrong, too faint to read, or missing. No API key, no upload, no network calls.

Expected to find text "[Total: $14.00]" but OCR read "[Total: €14.00]" (Confidence: 96%)
  Diff: Total: [$]14.00  →  Total: [€]14.00

npm install --save-dev @rendercheck/sdk

import { test } from '@playwright/test';
import { expect } from '@rendercheck/sdk/playwright';

test('checkout shows the right total', async ({ page }) => {
  await page.goto('/checkout');
  await expect(page).toShowText('Total: $14.00');
});

• Site and docs: getrendercheck.com (Playwright, Cypress, developer reference)
• SDK source and full options: packages/rendercheck
• Status: developer beta. Cypress support has been run in Cypress 13 (Electron, Linux) only.

This repository also contains the free browser tool at getrendercheck.com, which extracts text from images entirely in your browser (Tesseract.js, WebAssembly). The rest of this README describes that tool.

Free image-to-text tool

Free, private OCR that runs entirely in your browser: zero API costs, and your images never leave your device.

How it is built: see docs/ARCHITECTURE.md for the system, browser and SDK diagrams and a table mapping each privacy claim to the code and test that back it.

✨ Features

• 🚀 Fast - Runs on your device, so there is no upload wait
• 🔒 Private - Images are read in your browser and are not uploaded
• 🤖 Local OCR - Tesseract.js (WebAssembly) runs in your browser, self-hosted, with no model download
• 📊 Honest confidence - Low-confidence results are returned and flagged, not silently replaced
• 🎨 Image Enhancement - Preprocessing steps before recognition
• 💰 Completely Free - No API costs, no hidden fees
• 🌓 Dark/Light Mode - Beautiful UI with theme toggle
• 📱 Mobile Friendly - Responsive design for all devices
• ✨ V3 Premium UI - Aurora gradients, glass-morphism, micro-interactions
• ⌨️ Keyboard Shortcuts - Quick actions with keyboard (C/D/H/T/Escape)
• ♿ Accessible - Keyboard navigation; serious and critical axe-core checks run in CI
• 🎯 SEO Optimized - Intent-specific pages with FAQ rich snippets

🎨 UI Variants

V3 Premium UI (Recommended)

Enable with VITEUXV2=1 environment variable for:

• Aurora Background - Animated gradient blobs with grain texture
• Glass Morphism - Modern glassmorphic cards with backdrop blur
• Staged Progress - 3-step progress indicator (Upload → OCR → Render)
• Confetti Animation - Celebratory micro-interaction on copy
• History Drawer - Slide-in drawer with last 20 results
• Keyboard Shortcuts:
• C - Copy result
• D - Download result
• H - View history
• T - Toggle theme
• Escape - Close drawer/clear result
• Core Web Vitals - LCP < 1.8s, INP < 200ms, CLS < 0.1

Classic UI (Fallback)

Original simple UI without premium features.

🔍 SEO Defaults

All canonical and OG/Twitter image URLs are computed as absolute using VITESITEURL (see .env.example).

Shortened. The full README is on GitHub.