SEO Quake Alternative - DiagnoSEO

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Why people look for a SEO Quake alternative

SEOquake by Semrush has been around since 2006 — originally a Firefox add-on, now available across Chrome, Firefox, Opera, Edge, and Safari with around 3,200 ratings in the Chrome Web Store. Its signature features are different from most extensions in this comparison: a SERP overlay that injects backlink counts, Semrush rank, Google index size, and other metrics directly under each search result; keyword density analysis across 1-4 word phrases; an internal/external link analyzer; and CSV export. Connecting a Semrush account unlocks deeper metrics.

SEOquake and DiagnoSEO are different categories. SEOquake leans toward off-page SERP intelligence — what other people see when they search. DiagnoSEO leans toward on-page audit — what you can fix on the page you are viewing. Looking for a SEOquake alternative usually means one of these:

• No need for SERP overlay or off-page metrics. If you do not benchmark competitors at the SERP level, SEOquake's overlay adds clutter rather than insight.
• Want depth on the current page, not breadth across the search result. SEOquake's on-page audit is competent but not deep. No keyword placement scoring, no GEO/AI Overviews, no rendering diff, no quantified score.
• Do not want to be funneled into the Semrush ecosystem. Advanced features require a Semrush account, plans start around $139/month. For solo SEOs or small teams that is significant.

DiagnoSEO is built for the on-page side specifically. No SERP overlay, no off-page metrics, no Semrush dependency — but a deep on-page audit with GEO, keyword scoring, and HTML vs rendered DOM diff.

Feature comparison

Where DiagnoSEO wins

On-page depth. SEOquake covers on-page but does not go deep. DiagnoSEO adds the 0-100 SEO score, the 12+ keyword placement scoring, the GEO tab, the HTML vs rendered DOM diff, missing noopener detection, empty anchor warnings, redirect chain visualization with hop scoring, and hreflang duplicate detection. If your work is fixing the current page, DiagnoSEO gives you more to work with.

AI Overviews readiness. The GEO tab is unique among extensions in this comparison. llms.txt detection, FAQPage/Article/speakable schema validation, LLM-parseability metrics. SEOquake predates AI search and does not address it.

HTML vs rendered DOM diff. Critical for SPAs. SEOquake reads the live DOM only.

No Semrush ecosystem lock-in. DiagnoSEO is a free standalone tool with no upsell path that requires an external account. SEOquake's full power requires Semrush ($139+/month).

No telemetry. DiagnoSEO has zero analytics, zero tracking. SEOquake sends some telemetry to Semrush.

Where SEOquake wins

SERP overlay. SEOquake injects metrics directly under every search result on Google, Bing, Yahoo, Yandex, and Baidu. For competitive SERP analysis — "who outranks me, and what is their authority?" — this is genuinely the killer feature. DiagnoSEO does not do SERP overlay.

Backlink data integration. Connected to Semrush, SEOquake surfaces backlink counts and domain authority metrics per SERP result. DiagnoSEO does not include backlink data (the broader paid DiagnoSEO suite has it, but not the free extension).

Multi-search-engine support. SEOquake works on Bing, Yahoo, Yandex, and Baidu — useful for international SEO. DiagnoSEO is Google-focused (and search-engine-agnostic in that it audits the current page regardless of which search brought you there).

Domain comparison tool. SEOquake can compare up to five domains side-by-side on key metrics. DiagnoSEO does not have a comparison tool in the extension.

Keyword density across 1-4 word phrases. SEOquake's keyword density tool is more flexible than DiagnoSEO's basic word frequency.

When to use which

The two extensions serve different needs and complement each other well.

Use SEOquake when researching competitors at the SERP level, doing backlink-based domain comparisons, or working on international (non-Google) search engines.

Use DiagnoSEO when auditing the page you are looking at — fixing on-page issues, scoring against best practices, checking AI Overviews readiness, or inspecting JavaScript rendering.

Many SEO professionals install both. They do not conflict and serve genuinely separate workflows.

Frequently asked questions

• Does DiagnoSEO have a SERP overlay like SEOquake?

  No. SERP overlay is intentionally out of scope. DiagnoSEO focuses on auditing the current page rather than injecting data into search results. If SERP overlay is essential to your workflow, SEOquake or a similar tool remains the right choice.

• Does DiagnoSEO show backlink counts?

  The free extension does not. Backlink monitoring is part of the broader DiagnoSEO paid suite. For backlink-overlay-in-SERP specifically, SEOquake with a Semrush account is the dedicated tool.

• Can I use DiagnoSEO on Bing or Yandex like SEOquake?

  DiagnoSEO works on any web page regardless of which search engine you used to find it. There is no Bing/Yandex SERP overlay — DiagnoSEO audits the page you land on. SEOquake remains the better choice for non-Google SERP work.

• Is DiagnoSEO connected to any external SEO platform like SEOquake is to Semrush?

  DiagnoSEO is part of the broader DiagnoSEO suite (the SaaS at diagnoseo.com), but the extension works fully standalone — no account, no login, no platform requirement. There is no Semrush-style upsell.

• Is DiagnoSEO available for Firefox like SEOquake?

  Yes. Both Chrome and Firefox builds are available. SEOquake additionally supports Edge, Opera, and Safari; DiagnoSEO supports the Chromium-based browsers (Edge, Brave, Opera) via the Chrome ZIP. Safari is not currently supported.