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swap_horiz YSlow Alternatives

Looking for alternatives to YSlow? Compare the top Web Pagetest options ranked by our AI scoring system.

You're looking at alternatives to:
YSlow

YSlow

Web Pagetest Performance Legacy Browser Extension Page Analysis Yahoo

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.

5.4 Mediocre

apps Top YSlow Alternatives

The top alternative to YSlow in 2026 is Google Lighthouse with a score of 9.3/10, followed by Chrome DevTools Performance Panel (9.2) and HTTP Archive (8.8).

1
Google Lighthouse

Google Lighthouse

Google Lighthouse is an open-source, automated tool used to evaluate the performance and quality of webpages based on be...

Google Performance Open Source Audit
9.3 Excellent
2
Chrome DevTools Performance Panel

Chrome DevTools Performance Panel

The Chrome DevTools Performance Panel records and analyzes a webpage’s loading process, identifying bottlenecks like Jav...

Performance Browser Audit Chrome
9.2 Excellent
3
HTTP Archive

HTTP Archive

HTTP Archive is a collaborative project maintaining the most comprehensive open database of HTTP responses, providing da...

Performance Web Vitals Dataset Open Data
8.8 Great
4
Sentry Performance Monitoring

Sentry Performance Monitoring

Sentry Performance Monitoring is a real-time application performance monitoring (APM) tool that tracks key metrics like...

Performance Developer Error Tracking Rum
8.6 Great
5
Datadog Synthetic Monitoring

Datadog Synthetic Monitoring

Datadog Synthetic Monitoring uses real browser tests to measure the performance of websites and applications, reporting...

Performance Monitoring Enterprise Synthetic
8.5 Great
6
Locust

Locust

Locust is an open-source, command-line tool designed to simulate multiple concurrent users accessing and interacting wit...

Performance Open Source Load Testing Python
8.5 Great
7
Honeycomb

Honeycomb

Honeycomb is an open-source, automated website optimization platform that identifies and fixes performance bottlenecks b...

Performance Monitoring Developer Observability
8.5 Great
8
SpeedCurve

SpeedCurve

SpeedCurve is a web performance analysis tool that provides detailed insights into website loading times, identifying sp...

Performance Monitoring Web Synthetic
8.4 Great
9
Catchpoint

Catchpoint

Catchpoint is a network performance monitoring platform that analyzes website speed and availability by measuring respon...

Performance Monitoring Enterprise Web
8.4 Great
10
LogRocket

LogRocket

LogRocket is a product development platform that records every browser interaction – including page timing, mouse moveme...

Performance SAAS Frontend Rum
8.4 Great
11
DebugBear

DebugBear

DebugBear is an open-source browser extension that analyzes website performance by simulating real user experiences, ide...

Performance Monitoring Lighthouse Web
8.3 Great
12
Lighthouse CI

Lighthouse CI

Lighthouse CI is an open-source command-line tool that analyzes websites for performance issues like slow loading times...

Google Performance Automation Open Source
8.3 Great
13
Sitespeed.io

Sitespeed.io

Sitespeed.io is an open-source toolkit for measuring and improving website performance by analyzing various metrics like...

Performance Monitoring Open Source Self Hosted
8.2 Great
14
Blackfire.io

Blackfire.io

Blackfire.io is a free online tool that analyzes website loading speed by simulating real browser performance, providing...

Performance PHP Apm Profiling
8.2 Great
15
Artillery

Artillery

Artillery is a Google PageSpeed Insights tool that analyzes a website’s performance by simulating how it would load on v...

Performance Open Source Developer Load Testing
8.1 Great
16
RadView WebLOAD

RadView WebLOAD

RadView WebLOAD is an automated load testing tool designed to simulate concurrent users accessing websites and web appli...

Performance Legacy Enterprise Stress Test
6.7 Fair
17
Iago

Iago

Iago is a performance optimization tool that analyzes website code to identify and resolve inefficiencies like unminifie...

Performance Legacy Load Testing Twitter
5.4 Mediocre
18
http_load

http_load

http_load is a tool within WebPageTest that simulates concurrent HTTP requests to measure the impact of multiple users a...

Performance Legacy Open Source Load Testing
5.1 Mediocre
19
Multi-Mechanize

Multi-Mechanize

Multi-Mechanize is an open-source tool that analyzes website performance by simulating multiple browser sessions and mea...

Performance Legacy Open Source Load Testing
4.9 Poor
20
Pylot

Pylot

Pylot is an open-source, automated website optimization tool that analyzes and suggests improvements to a site’s perform...

Performance Legacy Open Source Load Testing
4.5 Poor

summarize Quick Comparison Summary

Alternative Score vs YSlow Action
Google Lighthouse
Google Lighthouse
Web Pagetest Google Performance Open Source
9.3 Excellent +3.9 Compare
Chrome DevTools Performance Panel
Chrome DevTools Performance Panel
Web Pagetest Performance Browser Audit
9.2 Excellent +3.8 Compare
HTTP Archive
HTTP Archive
Web Pagetest Performance Web Vitals Dataset
8.8 Great +3.4 Compare
Sentry Performance Monitoring
Sentry Performance Monitoring
Web Pagetest Performance Developer Error Tracking
8.6 Great +3.2 Compare
Datadog Synthetic Monitoring
Datadog Synthetic Monitoring
Web Pagetest Performance Monitoring Enterprise
8.5 Great +3.1 Compare
Locust
Locust
Web Pagetest Performance Open Source Load Testing
8.5 Great +3.1 Compare
Honeycomb
Honeycomb
Web Pagetest Performance Monitoring Developer
8.5 Great +3.1 Compare
SpeedCurve
SpeedCurve
Web Pagetest Performance Monitoring Web
8.4 Great +3.0 Compare
Catchpoint
Catchpoint
Web Pagetest Performance Monitoring Enterprise
8.4 Great +3.0 Compare
LogRocket
LogRocket
Web Pagetest Performance SAAS Frontend
8.4 Great +3.0 Compare

See all Web Pagetest ranked by score

emoji_events View Full Web Pagetest Rankings

help Frequently Asked Questions

What are the best alternatives to YSlow?
The top alternatives to YSlow in 2026 include Google Lighthouse, Chrome DevTools Performance Panel, HTTP Archive, Sentry Performance Monitoring, Datadog Synthetic Monitoring. Each offers unique features and is objectively scored on Lunoo to help you compare.
How does YSlow compare to its competitors?
Our AI-powered comparison system analyzes features, pricing, user reviews, and expert opinions to provide objective scores. YSlow scores 5.4/10. Click any alternative above to see a detailed side-by-side comparison.
Is YSlow worth it in 2026?
YSlow scores 5.4/10 in the Web Pagetest category. We recommend comparing it with the 20 alternatives listed above to find the best fit for your needs.
What is the best free alternative to YSlow?
Several alternatives to YSlow offer free plans or free tiers. Check the alternatives listed above and visit their websites to compare pricing and free options.
Why should I switch from YSlow?
Common reasons users look for YSlow alternatives include pricing, specific feature gaps, better integration needs, or simply exploring newer options. Our objective scoring helps you compare without bias.
How many alternatives to YSlow are there?
Lunoo currently lists 20 scored alternatives to YSlow in the Web Pagetest category, ranked by our AI-powered evaluation system.
Which YSlow alternative has the highest rating?
Google Lighthouse currently holds the highest rating among YSlow alternatives with a score of 9.3/10.
Can I use Google Lighthouse instead of YSlow?
Google Lighthouse is one of the top-rated alternatives to YSlow. While they serve similar purposes in the Web Pagetest space, each has distinct strengths. Use our comparison tool above for a detailed side-by-side analysis.
What is the cheapest alternative to YSlow?
Pricing varies among YSlow alternatives. We recommend checking each alternative's website for current pricing. Many options in the Web Pagetest category offer free tiers or competitive pricing.
How are YSlow alternatives ranked on Lunoo?
Lunoo uses an AI-powered scoring system that analyzes category fit, feature coverage, pricing signals, public reception, recency, and value to provide 0 to 10 scores. Rankings are updated continuously.
YSlow vs Google Lighthouse: which is better?
YSlow scores 5.4/10 while Google Lighthouse scores 9.3/10 on Lunoo. The best choice depends on your specific needs. Use our detailed comparison tool for a full breakdown.
YSlow vs Chrome DevTools Performance Panel: which is better?
YSlow scores 5.4/10 while Chrome DevTools Performance Panel scores 9.2/10 on Lunoo. The best choice depends on your specific needs. Use our detailed comparison tool for a full breakdown.
YSlow vs HTTP Archive: which is better?
YSlow scores 5.4/10 while HTTP Archive scores 8.8/10 on Lunoo. The best choice depends on your specific needs. Use our detailed comparison tool for a full breakdown.

category Explore Related Categories

Performance Legacy Browser Extension Web Pagetest Page Analysis Yahoo

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