synthux

Tracking since Apr 30, 2026.

Changelog

• Jun 14, 2026
  description

  synthux evaluates any web page using AI-powered analysis based on Nielsen's 10 Usability Heuristics and synthetic user profiles.
  
   What's New in v1.8
  • Issue Heatmap — Toggle a live severity heatmap directly on the analyzed page. Critical issues glow red, moderate yellow, minor green
  • Hover-to-Highlight — Hover any issue in the report to instantly highlight the affected element on the live page with severity-colored borders
  • Custom User Profiles — Create up to 5 custom personas with age, tech level, accessibility needs, and goals
  • WCAG Audit (axe-core) — Automated WCAG 2.2 AA compliance testing with impact severity and fix references
  • Vision Analysis — Full-page screenshot capture for visual hierarchy, color harmony, and CTA visibility analysis
  • Multi-Provider AI — Use local AI (Ollama) for free, or your own API key with Google Gemini, OpenAI, or Claude
  • Code Fix Suggestions — Concrete before/after code snippets for each issue
  • PDF & Markdown Export — Professional reports ready for stakeholders
  • Accurate Cost Tracking — Real-time token usage and cost estimation
   How It Works
  1. Open any web page and click the synthux icon
  2. Choose Quick (4 heuristics), Deep (10 heuristics), or Custom scan mode
  3. AI evaluates from multiple perspectives: First-Time Visitor, Power User, Accessibility User, and your custom profiles
  4. Get detailed scores (0-100), issues, recommendations, and code fixes
  5. Toggle the heatmap to see issue density, hover issues to highlight elements on the page
  6. Export as PDF or Markdown
   AI Providers
  • Local: Ollama (free, 100% private)
  • Cloud: Google Gemini, OpenAI, Anthropic Claude (BYOK)
   Privacy
  • No telemetry, no analytics, no data collection
  • BYOK — API keys stored only in your browser
  • Open source — github.com/synthuxapp/synthux

  synthux evaluates any web page using AI-powered analysis based on Nielsen's 10 Usability Heuristics and synthetic user profiles.
  
  What's New in v1.9.0
  • Flow Builder — Visual canvas for mapping multi-page user journeys. Connect pages, add sticky notes, and run cross-page UX analysis
  • Multi-Flow Saves — Save, name, load, and delete multiple flows independently
  • Session Tracking — Each analysis gets a unique session ID, preventing stale results from previous runs
  • Dynamic Vision Detection — Automatic capability check for Ollama vision models
  
  Key Features
  • Issue Heatmap — Toggle a live severity heatmap on the analyzed page. Critical = red, moderate = yellow, minor = green
  • Hover-to-Highlight — Hover any issue to instantly highlight the affected element on the live page
  • WCAG Audit (axe-core) — Automated WCAG 2.2 AA compliance testing with impact severity and fix references
  • Vision Analysis — Full-page screenshot capture for visual hierarchy, color harmony, and CTA visibility
  • Custom User Profiles — Create up to 5 custom personas with age, tech level, accessibility needs, and goals
  • Code Fix Suggestions — Concrete before/after code snippets for each issue
  • PDF & Markdown Export — Professional reports ready for stakeholders
  • Accurate Cost Tracking — Real-time token usage and cost estimation
  
  How It Works
  1. Open any web page and click the synthux icon
  2. Choose Quick (3 heuristics), Deep (10 heuristics), or Custom scan mode
  3. AI evaluates from multiple perspectives: First-Time Visitor, Power User, Accessibility User, and your custom profiles
  4. Get detailed scores (0-100), issues, recommendations, and code fixes
  5. Toggle the heatmap to see issue density, hover issues to highlight elements
  6. Use Flow Builder to analyze complete user journeys across multiple pages
  7. Export as PDF or Markdown
  
  AI Providers
  • Local: Ollama (free, 100% private)
  • Cloud: Google Gemini, OpenAI, Anthropic Claude (BYOK — bring your own key)
  
   Privacy
  • No telemetry, no analytics, no data collection
  • BYOK — API keys stored only in your browser
  • Open source — github.com/synthuxapp/synthux

• May 23, 2026
  description

  synthux evaluates any web page using AI-powered analysis based on Nielsen's 10 Usability Heuristics and synthetic user profiles.
  ✨ What's New in v1.6.0
  • Vision Analysis — Full-page screenshot capture for visual hierarchy, color harmony, and CTA visibility analysis
  • Multi-Provider AI — Use local AI (Ollama) for free, or your own API key with Google Gemini, OpenAI, or Claude
  • Accurate Cost Tracking — Real-time token usage and cost estimation
  • Code Fix Suggestions — Concrete before/after code snippets for each issue
  • PDF & Markdown Export — Professional reports ready for stakeholders
  🔍 How It Works
  1. Open any web page and click the synthux icon
  2. Choose Quick (4 heuristics) or Deep (10 heuristics) scan mode
  3. AI evaluates from 3 perspectives: First-Time Visitor, Power User, Accessibility User
  4. Get detailed scores (0-100), issues, recommendations, and code fixes
  5. Export as PDF or Markdown
  🤖 AI Providers
  • Local: Ollama (free, 100% private)
  • Cloud: Google Gemini, OpenAI, Anthropic Claude (BYOK)
  🔒 Privacy
  • No telemetry, no analytics, no data collection
  • BYOK — API keys stored only in your browser
  • Open source — github.com/synthuxapp/synthux

  synthux evaluates any web page using AI-powered analysis based on Nielsen's 10 Usability Heuristics and synthetic user profiles.
  
   What's New in v1.8
  • Issue Heatmap — Toggle a live severity heatmap directly on the analyzed page. Critical issues glow red, moderate yellow, minor green
  • Hover-to-Highlight — Hover any issue in the report to instantly highlight the affected element on the live page with severity-colored borders
  • Custom User Profiles — Create up to 5 custom personas with age, tech level, accessibility needs, and goals
  • WCAG Audit (axe-core) — Automated WCAG 2.2 AA compliance testing with impact severity and fix references
  • Vision Analysis — Full-page screenshot capture for visual hierarchy, color harmony, and CTA visibility analysis
  • Multi-Provider AI — Use local AI (Ollama) for free, or your own API key with Google Gemini, OpenAI, or Claude
  • Code Fix Suggestions — Concrete before/after code snippets for each issue
  • PDF & Markdown Export — Professional reports ready for stakeholders
  • Accurate Cost Tracking — Real-time token usage and cost estimation
   How It Works
  1. Open any web page and click the synthux icon
  2. Choose Quick (4 heuristics), Deep (10 heuristics), or Custom scan mode
  3. AI evaluates from multiple perspectives: First-Time Visitor, Power User, Accessibility User, and your custom profiles
  4. Get detailed scores (0-100), issues, recommendations, and code fixes
  5. Toggle the heatmap to see issue density, hover issues to highlight elements on the page
  6. Export as PDF or Markdown
   AI Providers
  • Local: Ollama (free, 100% private)
  • Cloud: Google Gemini, OpenAI, Anthropic Claude (BYOK)
   Privacy
  • No telemetry, no analytics, no data collection
  • BYOK — API keys stored only in your browser
  • Open source — github.com/synthuxapp/synthux

• May 17, 2026
  description

  Analyze any website's UX quality using AI — right from your browser.
  synthux evaluates web pages using Nielsen's 10 Usability Heuristics and synthetic user profiles, powered by local AI (Ollama). All processing happens on your machine. No data leaves your browser. No signup. No API costs.
  ⸻ FEATURES ⸻
  Local AI Analysis
  Run Ollama with Gemma 4, Qwen, Llama, or any model you prefer. Everything stays on your machine.
  Nielsen's 10 Heuristics
  Industry-standard UX evaluation framework with per-heuristic scoring (0–100).
   Synthetic User Profiles
  Evaluate as a first-time visitor, power user, or accessibility user — each with different expectations.
  Accessibility Audit
  WCAG contrast checks, alt text validation, heading structure, and keyboard navigation analysis.
  Detailed Scoring
  Overall UX score (0–100) with breakdowns per heuristic and actionable recommendations.
  Markdown Export
  Download reports as .md files — perfect for Notion, GitHub Issues, or design handoffs.
  Quick & Deep Modes
  Fast 3-heuristic scan or full 10-heuristic deep analysis.
  100% Private
  Your data never leaves your machine. Open source under MIT License.
  ⸻ HOW IT WORKS ⸻
  1. Install Ollama (ollama.com) or LM Studio and pull a model
  2. Enable Chrome extension access (see Setup Guide in Settings)
  3. Navigate to any website
  4. Open synthux Side Panel
  5. Click "Analyze Page"
  6. View results and export as Markdown
  ⸻ REQUIREMENTS ⸻
  • Ollama or LM Studio running locally
  • A language model (Gemma 4, Qwen, Llama, etc.)
  • Chrome 116+ (Side Panel API)
  ⸻ OPEN SOURCE ⸻
  synthux is free and open source: https://github.com/synthuxapp/synthux
  https://synthux.app
  
  Found a bug? Have a feature request? Open an issue on GitHub.

  synthux evaluates any web page using AI-powered analysis based on Nielsen's 10 Usability Heuristics and synthetic user profiles.
  ✨ What's New in v1.6.0
  • Vision Analysis — Full-page screenshot capture for visual hierarchy, color harmony, and CTA visibility analysis
  • Multi-Provider AI — Use local AI (Ollama) for free, or your own API key with Google Gemini, OpenAI, or Claude
  • Accurate Cost Tracking — Real-time token usage and cost estimation
  • Code Fix Suggestions — Concrete before/after code snippets for each issue
  • PDF & Markdown Export — Professional reports ready for stakeholders
  🔍 How It Works
  1. Open any web page and click the synthux icon
  2. Choose Quick (4 heuristics) or Deep (10 heuristics) scan mode
  3. AI evaluates from 3 perspectives: First-Time Visitor, Power User, Accessibility User
  4. Get detailed scores (0-100), issues, recommendations, and code fixes
  5. Export as PDF or Markdown
  🤖 AI Providers
  • Local: Ollama (free, 100% private)
  • Cloud: Google Gemini, OpenAI, Anthropic Claude (BYOK)
  🔒 Privacy
  • No telemetry, no analytics, no data collection
  • BYOK — API keys stored only in your browser
  • Open source — github.com/synthuxapp/synthux

• May 17, 2026
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Host access

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Screenshots