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Head-to-head · Google Algorithm Tracking Tools

Similarweb SERP Seismometer vs Serpstat

  • Updated Nov 2026
  • Both researched from official sources
  • 2 checks side by side
Higher score Similarweb SERP Seismometer #4 in Google Algorithm Tracking Tools 8.6/10 Free plan Free plan✓ 1 of 3 features Visit Similarweb
Serpstat #8 in Google Algorithm Tracking Tools 8.2/10 Free plan · 7-day trial Free planFree trial✓ 0 of 3 features Visit Serpstat

Similarweb SERP Seismometer leads on 0 checks, Serpstat on 0, and 2 are even. Who comes out ahead on the 2 yes/no, price and count checks where we have data for both products. The editor score weighs everything else too.

Our verdict

  • Highest scoreSimilarweb SERP Seismometer · 8.6/10
  • Free planboth
  • Free trialonly Serpstat
  • Most featuresSimilarweb SERP Seismometer · 1 of 3

Similarweb SERP Seismometer scores higher on our rubric for google algorithm tracking tools: 8.6 against 8.2 out of 10; our editors rank them #4 and #8.

Similarweb SERP Seismometer is the better fit for free desktop and mobile SERP volatility monitoring. Serpstat is the better fit for teams needing high keyword capacity at mid-tier pricing.

  • Similarweb SERP Seismometer fits best

    Free desktop and mobile SERP volatility monitoring

  • Serpstat fits best

    Teams needing high keyword capacity at mid-tier pricing

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Side by side

Feature Similarweb SERP Seismometer 8.6/10 Visit ↗ Serpstat 8.2/10 Visit ↗
At a glance
Editor score 8.6 8.2
Ranking #4 in Google Algorithm Tracking Tools #8 in Google Algorithm Tracking Tools
Best for Free desktop and mobile SERP volatility monitoring Teams needing high keyword capacity at mid-tier pricing
Pricing model Free Free plan + paid
Starting price Free plan $50/mo
Free plan ✓ ✓
Free trial — 7 days
Deployment Cloud Cloud, Browser extension
Platforms Web Web, Chrome extension
Built for Solo, Small business, Mid-market, Enterprise Solo, Small business, Mid-market, Enterprise
Features Similarweb SERP Seismometer 1/3 · Serpstat 0/3
Update alerts Not checked yet Not checked yet
Volatility index ✓ (best) Not checked yet
SERP feature tracking Not checked yet Not checked yet
Specs
Location views Not checked yet Not checked yet
Device views Both Not checked yet
History retention Not checked yet Not checked yet
Our review
Pros
  • 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
  • Tracks desktop and mobile rankings with daily updates
  • Combines keyword, competitor, backlink and site audit tools
  • Supports API access, scheduled reports and data integrations
Cons
  • Does not track individual site rankings
  • Focuses on volatility rather than broader SEO work
  • Available as a web tool, with cloud deployment
  • The 7-day trial requires a payment card
  • The free plan offers limited access rather than full features
  • Monthly pricing rises from $50 to $410 across the listed plans
Our verdict

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…

Read the review →

Serpstat brings keyword research, competitor analysis, rank tracking, backlink analysis and technical site auditing together for freelancers, agencies and marketing teams. Its daily desktop and mobile position updates, project-based…

Read the review →
  1. Similarweb SERP SeismometerGoogle Algorithm Tracking Tools 8.6Free plan
  2. SerpstatGoogle Algorithm Tracking Tools 8.2Free plan · 7-day trial

Strengths and trade-offs

  • Similarweb SERP Seismometer — 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

  • Serpstat — where it wins

    • Tracks desktop and mobile rankings with daily updates
    • Combines keyword, competitor, backlink and site audit tools
    • Supports API access, scheduled reports and data integrations

    Where it doesn't

    • The 7-day trial requires a payment card
    • The free plan offers limited access rather than full features
    • Monthly pricing rises from $50 to $410 across the listed plans
  • Similarweb SERP Seismometer8.6/10 · Free plan

    A free, focused way to monitor Google ranking turbulence across desktop and mobile.

    Visit SimilarwebFull verdict →
  • Serpstat8.2/10 · Free plan · 7-day trial

    High keyword capacity and daily rank tracking, with paid plans starting at $50/month.

    Visit SerpstatFull verdict →

More comparisons

All google algorithm tracking tools comparisons → · Full ranking →

Reviewed by iTechGuides Editors · Editorial team · Updated Nov 2026

Last updated · How we research and update