What are the key differences between YSlow and Google Lighthouse?

Compare YSlow and Google Lighthouse side by side on Lunoo to see detailed feature differences, AI scores, and expert analysis.

How are YSlow and Google Lighthouse scored?

YSlow has an AI score of 5.4/10 and Google Lighthouse has an AI score of 9.4/10. Scores are based on category fit, feature coverage, pricing signals, public reception, and recency.

YSlow vs Google Lighthouse 2026 - Compared

YSlow

Google Lighthouse

WINNER Google Lighthouse

Google Lighthouse edges ahead with a score of 9.4/10 compared to 5.4/10 for YSlow. While both are highly rated in their...

YSlow

5.4 Mediocre

Web Pagetest Get YSlow open_in_new

emoji_events WINNER

Google Lighthouse

9.4 Excellent

Lighthouse Analyzer Get Google Lighthouse open_in_new

psychology AI Verdict

Google Lighthouse edges ahead with a score of 9.4/10 compared to 5.4/10 for YSlow. While both are highly rated in their respective fields, Google Lighthouse demonstrates a slight advantage in our AI ranking criteria. A detailed AI-powered analysis is being prepared for this comparison.

emoji_events Winner: Google Lighthouse

verified Confidence: Low

Ready to decide? Get Google Lighthouse arrow_forward

description Overview

YSlow

YSlow is an open-source tool that analyzes website performance by measuring First Contentful Paint, Largest Contentful Paint, and Cumulative Layout Shift, providing data to identify and address potential bottlenecks impacting page load speed and user experience.

Google Lighthouse

Google Lighthouse is an open-source, automated tool used to evaluate the performance and quality of webpages based on best practices established by Google, providing scores for areas like accessibility, best practices, and performance.