Which is the best free SEO tool?

Free SEO Analytics Tools

Google Analytics
Data Studio
Keyword Hero
Mozcast
Panguin Tool
Free Crawling & Indexing Tools

Redirect Path
Link Redirect Trace
Quick Click Website Audit
Screaming Frog SEO Spider
Screaming Frog Log File Analyzer
SEOlyzer
Xenu
Where Goes?
Check My Links
Robots.txt Generator
HEADMaster SEO
Keep-Alive Validation SEO Tool
Hreflang Tag Generator
XML Sitemaps
BROWSEO
SFAIK Screaming Frog Analyzer
Free Keyword Research Tools

AnswerThePublic
Keyword Explorer
Keyword Planner
Keyword Sheeter
Keywords Everywhere
Wordable | Google Docs to WordPress in 1-Click
Also Asked
Google Trends
Keyword Surfer
CanIRank
Seed Keywords
Exploding Topics
Ubersuggest
Keys4Up
Wordtracker Scout
KWFinder
Free Link Tools

Disavow Tool
Moz Link Explorer
Link Miner
Backlink Checker
The Anchor Text Suggestion Tool By Linkio
SendPulse
Magic PR
Scraper
Help A Reporter (HARO)
Streak
Local SEO

Google Business Profile
Whitespark Google Review Link Generator
Local Search Results Checker
Moz Local Check Business Listing
Whitespark Local Citation Finder
Review Handout Generator
Fakespot Review Checker
Mobile SERP Test
Mobile SEO

Merkle Mobile-First Index Checker
Mobile-Friendly Test
GTMetrix
Cloudflare
Free Multi-Tools

Semrush
Chrome DevTools
Marketing Miner
MozBar
SEO Minion
SEOquake
Sheets For Marketers
Sheet Consolidator
Google Search Console
Small SEO Tools
Internet Marketing Ninjas
Ahref’s SEO Toolbar
Bing Webmaster Tools
Woorank
SEObility
Lipperhey
Dareboost
Siteliner
On-Page SEO

Counting Characters Google SERP Tool
Natural Language API Demo
Rich Results Test
Structured Markup Validator
Ryte Structured Data Helper
Google Tag Manager
View Rendered Source
Higher Visibility Google SERP Snippet Optimization Tool
Merkle’s Schema Markup Generator
Animalz Revive
Copyscape Free Comparison Tool
Research

BuzzSumo
Hunter
SimilarWeb
Wappalyzer
Wayback Machine
SEO Explorer
Free Rank Checking Tools

Ahref’s SERP Checker
SERPROBOT
Taptimize
Bulk Google Rank Checker
LSI Graph
Free Site Speed Tools

Mobile-Friendly Test
Lighthouse
Page Speed Insights
SpeedMonitor.io – Website Speed Monitoring
WebpageTest
Web.dev
Web Vitals
WordPress SEO Tools

RankMath
Yoast SEO
Ahrefs WordPress SEO Plugin