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swap_horiz YSlow Alternatives

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

You're looking at alternatives to:
YSlow

YSlow

WebPageTest 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 Site Relic with a score of 5.6/10, followed by Pingometer (5.4) and Speedchecker (5.4).

1
Site Relic

Site Relic

Site Relic is an open-source tool that analyzes websites to identify and quantify performance bottlenecks related to ima...

Performance Monitoring Uptime Free Tools
5.6 Mediocre
2
Pingometer

Pingometer

Pingometer is a free online tool that analyzes website loading speed by measuring key metrics like First Byte Time, Full...

Monitoring SAAS Synthetic Uptime
5.4 Mediocre
3
Speedchecker

Speedchecker

Speedchecker is a tool developed by Google that analyzes website loading speed based on various metrics like First Conte...

Monitoring SAAS Global Diagnostic
5.4 Mediocre
4
AChecker

AChecker

AChecker is a web application that analyzes text for grammar, spelling, style, and clarity issues, offering suggestions...

Free Accessibility Open Source Wcag
5.4 Mediocre
5
Phantomas

Phantomas

Phantomas is a continuously updated, publicly accessible database tracking the online presence of defunct websites, prim...

Headless Performance Metrics Open Source
5.4 Mediocre
6
PerfPerfPerf Speed Test

PerfPerfPerf Speed Test

PerfPerfPerf Speed Test is a free online tool that analyzes website loading performance by measuring key metrics like Fi...

Free Performance Audit Web
5.3 Mediocre
7
Robotalp

Robotalp

Robotalp is a tool developed by Google that analyzes website performance data to identify and prioritize optimization op...

Monitoring Page Speed SAAS SSL
5.3 Mediocre
8
Cloudprober

Cloudprober

Cloudprober is an open-source tool that simulates a user’s connection to a website from various global locations, measur...

Monitoring Open Source Synthetic Uptime
5.2 Mediocre
9
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
10
PageScoring Website Speed Test

PageScoring Website Speed Test

PageScoring’s website speed test analyzes a webpage's loading time and performance across multiple geographic locations,...

Free Performance Web Speed Test
5.0 Mediocre
11
Visual SEO Studio

Visual SEO Studio

Visual SEO Studio is a tool that analyzes website loading speed and identifies performance bottlenecks by visualizing pa...

Technical SEO SEO Desktop Audit
4.9 Poor
12
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
Site Relic
Site Relic
WebPageTest Performance Monitoring Uptime
5.6 Mediocre +0.2 Compare
Pingometer
Pingometer
WebPageTest Monitoring SAAS Synthetic
5.4 Mediocre Same Compare
Speedchecker
Speedchecker
WebPageTest Monitoring SAAS Global
5.4 Mediocre Same Compare
AChecker
AChecker
WebPageTest Free Accessibility Open Source
5.4 Mediocre Same Compare
Phantomas
Phantomas
WebPageTest Headless Performance Metrics
5.4 Mediocre Same Compare
PerfPerfPerf Speed Test
PerfPerfPerf Speed Test
WebPageTest Free Performance Audit
5.3 Mediocre -0.1 Compare
Robotalp
Robotalp
WebPageTest Monitoring Page Speed SAAS
5.3 Mediocre -0.1 Compare
Cloudprober
Cloudprober
WebPageTest Monitoring Open Source Synthetic
5.2 Mediocre -0.2 Compare
http_load
http_load
WebPageTest Performance Legacy Open Source
5.1 Mediocre -0.3 Compare
PageScoring Website Speed Test
PageScoring Website Speed Test
WebPageTest Free Performance Web
5.0 Mediocre -0.4 Compare

See all WebPageTest ranked by score

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help Frequently Asked Questions

What are the best alternatives to YSlow?
The top alternatives to YSlow in 2026 include Site Relic, Pingometer, Speedchecker, AChecker, Phantomas. 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 WebPageTest category. We recommend comparing it with the 12 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 12 scored alternatives to YSlow in the WebPageTest category, ranked by our AI-powered evaluation system.
Which YSlow alternative has the highest rating?
Site Relic currently holds the highest rating among YSlow alternatives with a score of 5.6/10.
Can I use Site Relic instead of YSlow?
Site Relic is one of the top-rated alternatives to YSlow. While they serve similar purposes in the WebPageTest 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 WebPageTest 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 Site Relic: which is better?
YSlow scores 5.4/10 while Site Relic scores 5.6/10 on Lunoo. The best choice depends on your specific needs. Use our detailed comparison tool for a full breakdown.
YSlow vs Pingometer: which is better?
YSlow scores 5.4/10 while Pingometer scores 5.4/10 on Lunoo. The best choice depends on your specific needs. Use our detailed comparison tool for a full breakdown.
YSlow vs Speedchecker: which is better?
YSlow scores 5.4/10 while Speedchecker scores 5.4/10 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 WebPageTest Page Analysis Yahoo

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