Structured data testing splits into two questions: is it valid, and will Google use it? Verdict first, rubric second.
Quick answer
Google’s Rich Results Test scores 91/100 and wins because it answers the question that matters most: is your markup eligible for Google rich results? It is free, validates a live URL or pasted code against Google’s ~30 supported rich-result types, and shows detected items, warnings, and errors. The runner-up, the Schema.org Validator (the successor to the old Structured Data Testing Tool), checks the full Schema.org vocabulary. Use both, then monitor live pages with Google Search Console Enhancement reports.
The ranking
| Rank | Tool | Best for | Price | SR Score |
|---|---|---|---|---|
| 1 | Google Rich Results Test | Google rich-result eligibility | Free | 91 |
| 2 | Schema.org Validator (Schema Markup Validator) | Full-vocabulary validation | Free | 88 |
| 3 | Google Search Console (Enhancement reports) | Live monitoring at scale | Free | 86 |
| 4 | Semrush Site Audit | Structured data inside site audits | From ~$117/mo | 80 |
| 5 | Ahrefs Site Audit | Structured data inside site audits | From ~$108/mo | 79 |
How to choose
Use the tools in sequence, not in competition. Before deploy: run the markup through the Schema.org Validator to confirm it is structurally valid across the full vocabulary, then through Google’s Rich Results Test to confirm it is eligible for a Google rich result. These answer two different questions — “is it valid?” and “will Google use it?” — and you need both green. After deploy: monitor live pages with Google Search Console’s Enhancement reports, which show how Google actually parsed your indexed pages at scale and flag errors you can’t catch one URL at a time.
Where do the paid suites fit? Semrush and Ahrefs roll structured-data checks into a site-wide crawl, which is convenient if you already pay for them and want one report covering everything. But they are not authoritative on Google rich-result eligibility — only Google’s own tool is — so treat them as a coverage net, not the final word.
Methodology
Weights: Validation accuracy & authority 30, Coverage vs. claims 25, Value for money 20, Support & docs 15, Transparency 10.
Authority leads: for structured data, the source closest to the search engine’s own rules wins, because that is what determines whether you actually get a rich result. Coverage rewards breadth — Google’s supported types versus the full Schema.org vocabulary versus site-wide monitoring. The free Google and Schema.org tools dominate; suite tools add value mainly when bundled with an audit.
Google Rich Results Test — 91
The authoritative eligibility checker. Test a live URL or paste code, and it renders the page, detects structured data, and reports which Google rich-result types it qualifies for, with item-level errors and warnings. Free, no account.
Trade-off: it only validates Google’s ~30 supported rich-result types, not the full Schema.org vocabulary — valid markup for an unsupported type may not appear. It checks one URL at a time.
| Criterion | Score |
|---|---|
| Validation accuracy & authority (30) | 29 |
| Coverage vs. claims (25) | 21 |
| Value for money (20) | 20 |
| Support & docs (15) | 13 |
| Transparency (10) | 8 |
Schema.org Validator (Schema Markup Validator) — 88
The successor to Google’s retired Structured Data Testing Tool, now hosted by Schema.org. It validates all Schema.org types and properties without Google-specific eligibility logic — ideal for confirming your markup is structurally correct across the full ~800-type vocabulary. Free.
Trade-off: it tells you the markup is valid Schema.org, not whether Google will show a rich result. Pair it with the Rich Results Test.
| Criterion | Score |
|---|---|
| Validation accuracy & authority (30) | 26 |
| Coverage vs. claims (25) | 24 |
| Value for money (20) | 20 |
| Support & docs (15) | 11 |
| Transparency (10) | 7 |
Google Search Console — Enhancement reports — 86
The only tool here that monitors structured data on your live, indexed pages at scale. GSC’s Enhancement reports (Products, FAQs, Breadcrumbs, etc.) show valid items, warnings, and errors across the whole site as Google actually parsed them, and let you request validation after a fix. Free for verified properties.
Trade-off: reactive and lagging — it reflects what Google has already crawled, not a pre-deploy test. Use it for monitoring, not first-pass validation.
| Criterion | Score |
|---|---|
| Validation accuracy & authority (30) | 27 |
| Coverage vs. claims (25) | 20 |
| Value for money (20) | 20 |
| Support & docs (15) | 12 |
| Transparency (10) | 7 |
Semrush Site Audit — 80
Structured-data validation as one check inside a full technical audit, flagging markup issues across your crawl alongside everything else. From about $117/mo (annual), audit up to 100,000 pages/month.
Trade-off: it is bundled in a paid suite and is not as authoritative on rich-result eligibility as Google’s own tool. Worth it if you already use Semrush.
| Criterion | Score |
|---|---|
| Validation accuracy & authority (30) | 22 |
| Coverage vs. claims (25) | 20 |
| Value for money (20) | 14 |
| Support & docs (15) | 14 |
| Transparency (10) | 10 |
Ahrefs Site Audit — 79
Like Semrush, Ahrefs flags structured-data issues within its site audit and crawl reports. Included on all plans; Lite about $108/mo (annual).
Trade-off: bundled, suite-priced, and secondary to Google’s own validators for eligibility. Convenient if Ahrefs is already your platform.
| Criterion | Score |
|---|---|
| Validation accuracy & authority (30) | 22 |
| Coverage vs. claims (25) | 19 |
| Value for money (20) | 14 |
| Support & docs (15) | 13 |
| Transparency (10) | 10 |
Re-weighting the rank
The Rich Results Test wins because we weight authority highest — for structured data, the engine’s own verdict on eligibility is what ultimately matters. But the two free Google/Schema.org tools are close, and which is “first” depends on your goal: if you care about full-vocabulary correctness over Google-specific eligibility (for example, marking up types Google doesn’t surface as rich results), weight coverage up and the Schema.org Validator becomes your #1. If your priority is monitoring an existing large site, weight scale up and GSC’s Enhancement reports lead. All three are free; the practical answer is to use them together.
Verification
- Google Rich Results Test — eligibility-focused validation against Google’s supported rich-result types verified at search.google.com/test/rich-results and Google Search Central documentation; free.
- Schema.org Validator — confirmed as the successor to the retired Structured Data Testing Tool, full-vocabulary validation, hosted at validator.schema.org (per Google Search Central guidance); free.
- Google Search Console — Enhancement reports for structured data documented in Google Search Central; free for verified properties.
- Semrush Site Audit — structured-data check within audit; pricing on semrush.com/pricing/seo.
- Ahrefs Site Audit — structured-data flags within audit; pricing via Ahrefs pricing listings.
Related rankings
- Best Schema Markup Generator Tools (2026): Scored & Ranked
- Best Core Web Vitals Tools (2026): Scored & Ranked
- Best Redirect Checker Tools (2026): .htaccess & 301 Ranked
- Best Indexing Tools for SEO (2026): Scored & Ranked
Frequently asked questions
- What is the best structured data testing tool in 2026?
- Google's Rich Results Test (91/100). It is the authoritative, free check for whether your markup is eligible for Google rich results, validating against Google's ~30 supported types and showing detected items and errors. It does not check the full Schema.org vocabulary — pair it with the Schema.org Validator.
- What happened to the Structured Data Testing Tool?
- Google retired its old Structured Data Testing Tool and migrated it to Schema.org, where it lives as the Schema Markup Validator (Schema.org Validator). It validates all Schema.org types without Google-specific eligibility checks.
- Rich Results Test vs. Schema.org Validator — which do I use?
- Both. Rich Results Test confirms Google rich-result eligibility for supported types; the Schema.org Validator confirms your markup is valid across the full ~800-type vocabulary. Then use GSC's Enhancement reports to monitor live pages at scale.
- Are these tools free?
- Yes. Rich Results Test, the Schema.org Validator, and Google Search Console are all free. Paid suite validators (Semrush, Ahrefs) add structured-data checks inside broader site audits.