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SEOSEOPaid AcquisitionPaid acquisitionProgrammaticWebsite MonetizationProgrammaticApp UAApp MonetizationWebsite monetizationKeyword ResearchSearch IntentApp acquisitionROASCPAApp monetizationCPCLTVAffiliateeCPMRPMRetail MediaAttributionConversion TrackingCreative IntelMMPHeader BiddingDSPSSPRTBAd ViewabilityFill RateASOSKAdNetworkARPDAURewarded VideoAd MediationAffiliateCreative TestingA/B TestingRetargetingLookalike AudiencesCampaign OptimizationBrand SafetySupply Path

SEO

Schema Markup Validator

Free

Schema Markup Validator is the community tool for checking structured data syntax and usage of the Schema vocabulary on a webpage or code snippet. It parses formats such as JSON-LD, Microdata, and RDFa, then reports detected entities and vocabulary-related errors, but it does not determine eligibility for Google-specific search features. It is best for developers and SEO specialists validating general markup, while Google's Rich Results Test remains the appropriate companion for supported Google rich result requirements and previews.

Optimizationstructured dataschema.orgjson-ldmarkup validation
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Concepts behind this tool

Technical SEO

Technical SEO helps search engines crawl, understand, render, and index a website.

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Ahrefs

Ahrefs is a search marketing platform developed by Ahrefs for researching websites, keywords, backlinks, competitors, content, and organic visibility. Its main workflows include Site Explorer, Keywords Explorer, Site Audit, Rank Tracker, Content Explorer, and newer AI visibility features, supported by Ahrefs' own web and search datasets. It is best suited to SEO professionals, content teams, and agencies that need deep competitive research and link analysis alongside ongoing technical audits and ranking monitoring.

SEO
Freemium

SEMrush

Semrush is a digital marketing platform developed by Semrush for SEO, competitive intelligence, content, paid search, social, and AI visibility workflows. Its SEO toolkit covers keyword research, domain and competitor analysis, position tracking, backlink analysis, site audits, on-page recommendations, link building, and reporting, with additional modules extending beyond organic search. It fits in-house teams and agencies that want a broad research and campaign suite rather than separate products for each search marketing discipline.

SEO
Freemium

Screaming Frog

Screaming Frog SEO Spider is a desktop website crawler developed by Screaming Frog for technical SEO auditing. It follows links and collects response codes, titles, metadata, canonicals, directives, headings, structured data, duplicate signals, and other page-level information, with configurable rendering, extraction, integrations, and bulk exports. It is best for SEO specialists and developers diagnosing large sites, migrations, broken links, redirect chains, indexation controls, or template problems that are difficult to spot page by page.

SEO