Similarweb SERP Seismometer

Free#4 of 27 in Google Algorithm Tracking Tools

Similarweb SERP Seismometer: A free, focused way to monitor Google ranking turbulence across desktop and mobile. Ranked #4 of 27 in Google Algorithm Tracking Tools by our editors (8.6/10); pricing: Free plan; best for free desktop and mobile SERP volatility monitoring.

8.6/10Editor score

Visit Similarweb

Similarweb SERP Seismometer8.6 Visit Similarweb

At a glance

Editor score
8.6 / 10
Pricing
Free plan
Best for
Free desktop and mobile SERP volatility monitoring
Free plan
Yes
Paid from
Free
Volatility index
Yes
Facts checked
14 Nov 2026

Where it wins
- Tracks daily volatility across 10,000+ monitored domains and keywords
- Shows separate desktop and mobile volatility views
- Includes risk levels and 30- and 90-day averages
Where it doesn't
- Does not track individual site rankings
- Focuses on volatility rather than broader SEO work
- Available as a web tool, with cloud deployment

Our verdict on Similarweb SERP Seismometer

Similarweb SERP Seismometer is a free web tool for SEO professionals and site owners who want to spot periods of turbulence in Google search results. It monitors fluctuations across more than 10,000 domains and keywords daily, then presents current volatility, risk-level indicators, and 30- and 90-day averages. Separate desktop and mobile views help distinguish changes by device. Its purpose is to show broad SERP movement that may coincide with Google algorithm changes, not to diagnose a particular site's ranking performance.

The product's clearest strength is its narrow focus: daily volatility readings, device-specific views, and multiple time windows give users a concise way to gauge whether search results are unusually unsettled. That makes it relevant for SEO monitoring without requiring a paid plan. It is a standalone tool rather than a larger SEO suite, so teams seeking keyword research, site audits, or other broader workflows will need other products alongside it.

The main limitation is also its scope. SERP Seismometer does not provide individual site ranking tracking; Similarweb directs users to its separate Rank Tracker for that purpose. Choose it if you need a free pulse on Google-wide ranking turbulence across desktop and mobile, and do not need site-specific positions from this tool. Choose a rank tracker or broader SEO product instead if the core task is following a site's own rankings or managing more of the SEO workflow.

Your product? Our editors can test Similarweb SERP Seismometer in depth and publish a review, labelled as paid · from $149/mo →

Similarweb SERP Seismometer pricing

Plans Free planFree Free to use — no paid tier required for the core job.

See plans on similarweb.com

Similarweb SERP Seismometer fact sheet

Free plan	Yes
Paid from	Free
Update alerts	Not verified
Volatility index	Yes
SERP feature tracking	Not verified
Location views	Not verified
Device views	Both
History retention	Not verified
Deployment	Cloud
Platforms	Web
Built for	Solo, Small business, Mid-market, Enterprise (editorial estimate)
Pricing	Free plan
Website	similarweb.com
Facts checked	14 Nov 2026

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The editor score above is our own research. What this page doesn't have yet is a reader's view — what you used Similarweb SERP Seismometer for, what worked and what didn't. No stars are seeded and no review is paid for; an editor reads every one before it appears.

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Featured on iTechGuides

Similarweb SERP Seismometer is listed in our Google Algorithm Tracking Tools directory. Add the badge to your site — it links back to this page.

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Reviewed by iTechGuides Editors · Editorial team · Updated Nov 2026

Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.

Last updated 14 Nov 2026 · How we research and update