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Best alternatives to W3C Markup Validation Service for CSR pages (2026)

10 Chrome extensions that do a similar job to W3C Markup Validation Service for CSR pages, closest first. Each shows real store users, its rating, how recently it was updated and how many permissions it asks for.

W3C Markup Validation Service for CSR pages: reviews, users and permissionsBest Developer Tools extensions

W3C Markup Validation Service for CSR pages today

≈3K users3.7★ from 3 ratingsNot updated for 2+ years4 permissions

W3C Markup Validation Service for CSR pages alternatives, compared

  1. 1

    CSS validator

    Use w3c css validator online to validate CSS by this CSS checker tool faster than pronouncing invalid property value CSS

    416 users4.0★ from 3 ratingsUpdated 24 months ago1 permissions
    • About 7.2× fewer users than W3C Markup Validation Service for CSR pages
    • Updated more recently
    • Asks for fewer permissions (1 vs 4)
    Compare side by side
  2. 2

    HTML Validator

    Add HTML Validator in Developer Tools

    ≈30K users3.5★ from 37 ratingsNot updated for 3+ years6 permissions
    • About 10× more users than W3C Markup Validation Service for CSR pages
    • Updated less recently
    • Asks for more permissions (6 vs 4)
    HTML Validator alternativesCompare side by side
  3. 3

    HTML Validator

    Employ an HTML Validator online to swiftly validate HTML code. Leverage our syntax check verifier as an effective HTML error checker

    ≈2K users3.6★ from 7 ratingsNot updated for 2+ years6 permissions
    • About 1.5× fewer users than W3C Markup Validation Service for CSR pages
    • Updated more recently
    • Asks for more permissions (6 vs 4)
    Compare side by side
  4. 4

    Apollo Client Devtools

    GraphQL debugging tools for Apollo Client.

    ≈200K users2.5★ from 269 ratingsUpdated 3 weeks ago1 permissions
    • About 67× more users than W3C Markup Validation Service for CSR pages
    • Updated more recently
    • Asks for fewer permissions (1 vs 4)
    Apollo Client Devtools alternativesCompare side by side
  5. 5

    SAML-tracer

    A debugger for viewing SAML messages

    ≈400K users4.5★ from 36 ratingsUpdated 3 months ago2 permissions
    • About 133× more users than W3C Markup Validation Service for CSR pages
    • Updated more recently
    • Asks for fewer permissions (2 vs 4)
    SAML-tracer alternativesCompare side by side
  6. 6

    Lighthouse-MD: PageSpeed audits to CLAUDE.md

    Run a Lighthouse / PageSpeed Insights audit on any page, generate a CLAUDE.md fix plan for Claude Code.

    ≈1K users5.0★ from 1 ratingUpdated 2 days ago6 permissions
    • About 3.0× fewer users than W3C Markup Validation Service for CSR pages
    • Updated more recently
    • Asks for more permissions (6 vs 4)
    Compare side by side
  7. 7

    PageSpy

    Use PageSpy to debug almost any webpage, with built-in user interaction recording, support download / upload log file for replay.

    380 users5.0★ from 1 ratingUpdated 10 months ago4 permissions
    • About 7.9× fewer users than W3C Markup Validation Service for CSR pages
    • Updated more recently
    Compare side by side
  8. 8

    PageSpeed Insights (MV3)

    Analyze the performance of your webpages and get specific suggestions on how to optimize them.

    ≈40K users3.5★ from 77 ratingsNot updated for 3+ years6 permissions
    • About 13× more users than W3C Markup Validation Service for CSR pages
    • Updated less recently
    • Asks for more permissions (6 vs 4)
    PageSpeed Insights (MV3) alternativesCompare side by side
  9. 9

    CSR vs SSR Detector

    Detect if a webpage is using Client-Side Rendering or Server-Side Rendering

    ≈1K users4.6★ from 8 ratingsUpdated 5 days ago5 permissions
    • About 3.0× fewer users than W3C Markup Validation Service for CSR pages
    • Updated more recently
    • Asks for more permissions (5 vs 4)
    Compare side by side
  10. 10

    Redux DevTools

    Redux DevTools for debugging application's state changes.

    ≈1M users4.3★ from 740 ratingsUpdated 3 weeks ago6 permissions
    • About 333× more users than W3C Markup Validation Service for CSR pages
    • Updated more recently
    • Asks for more permissions (6 vs 4)
    Redux DevTools alternativesCompare side by side

W3C Markup Validation Service for CSR pages alternatives: questions

What is the best alternative to W3C Markup Validation Service for CSR pages?

By users, the most popular alternative is Redux DevTools with ≈1M users and a 4.3-star rating. The closest match by what it does is CSS validator.

Which W3C Markup Validation Service for CSR pages alternative has the best rating?

Redux DevTools has the highest rating of these alternatives with 50+ ratings: 4.3 out of 5 from 740 ratings.

Is there a W3C Markup Validation Service for CSR pages alternative that asks for fewer permissions?

CSS validator asks for 1 permissions, against 4 for W3C Markup Validation Service for CSR pages.

How many alternatives to W3C Markup Validation Service for CSR pages are there?

We list 10 close alternatives to W3C Markup Validation Service for CSR pages on the Chrome Web Store, picked by what they do and ranked by how close they are.

Users and ratings are the figures shown on the Chrome Web Store, re-checked continuously. Alternatives are matched on name, description, category and topic. Browse best-of lists by niche.