See It in Action
A clean, professional interface in your browser's side panel.
Open source Chrome extension that evaluates web pages using synthetic user profiles, Nielsen's 10 Usability Heuristics, WCAG audit, and vision analysis — powered by local AI or your own API key.
Everything you need for comprehensive UX evaluation.
Local via Ollama (free) or cloud with your own API key — Gemini, OpenAI, or Claude. BYOK, no middleman.
Industry-standard UX evaluation framework with weighted scoring and actionable recommendations.
Automated WCAG 2.2 AA compliance testing. Violations with impact severity, affected elements, and fix references.
Create up to 5 custom personas with age, tech level, accessibility needs, and goals — alongside 3 built-in profiles.
Quick, Deep, or Custom — pick specific heuristics via toggle chips. Dynamic time estimates based on your selection.
Full-page screenshot capture. AI evaluates visual hierarchy, color harmony, and CTA visibility alongside DOM data.
Professional reports with scores, code fixes, cost estimates, and priority matrix. Share with stakeholders.
0-100 scores per heuristic with code fix suggestions, quick win indicators, and priority matrix.
BYOK model — API keys stay in your browser. No middleman, no telemetry, no data collection.
Toggle a live heatmap overlay on the analyzed page. Critical issues glow red, moderate yellow, minor green — see problem density at a glance.
Hover any issue in the report to instantly highlight the affected element on the live page with severity-colored borders and tooltips.
Visual canvas to map multi-page user journeys. Connect pages, add notes, run cross-page UX analysis, save & load multiple flows.
Choose the setup that fits your workflow.
Times shown per profile. Selecting multiple profiles multiplies the duration proportionally.
Get started in under 5 minutes.
Local (free): Install Ollama and pull a model. Cloud: Enter your Gemini, OpenAI, or Claude API key in Settings.
Open the side panel, select Quick, Deep, or Custom mode, and hit Analyze. Get scores, WCAG audit, code fixes, and exportable reports.
Ollama users: run launchctl setenv OLLAMA_ORIGINS "*" (macOS) or export OLLAMA_ORIGINS="*" (Linux) then restart Ollama.
See the full setup guide for details.
A clean, professional interface in your browser's side panel.
Built with a privacy-first architecture. No exceptions.
Local mode runs entirely on your machine. Cloud mode uses your own API key directly — no middleman
No telemetry, no analytics, no tracking in the extension
Automated security scanning with Dependabot & CodeQL
Open source — inspect every line of code yourself
Built in the open. Contributions welcome.
synthux is MIT licensed. Fork it, extend it, make it yours.
Support synthux development
If you find synthux useful, consider supporting its development.
0x2612b77E5ee1b5feeDdD5eC08731749bC2217F54
3GFG3AEv7oEiJMns1QmoJTeLaPgzZmhXUoCpSdntzyBk