Head-to-head · Google Algorithm Tracking Tools

Semrush vs Similarweb SERP Seismometer

Updated Nov 2026
Both researched from official sources
2 checks side by side

Higher score Semrush #1 in Google Algorithm Tracking Tools 9.2/10 Free plan · 7-day trial Free planFree trial✓ 0 of 3 features Visit Semrush

Similarweb SERP Seismometer #4 in Google Algorithm Tracking Tools 8.6/10 Free plan Free plan✓ 1 of 3 features Visit Similarweb

Semrush leads on 0 checks, Similarweb SERP Seismometer 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 scoreSemrush · 9.2/10
Free planboth
Free trialonly Semrush
Most featuresSimilarweb SERP Seismometer · 1 of 3

Semrush scores higher on our rubric for google algorithm tracking tools: 9.2 against 8.6 out of 10; our editors rank them #1 and #4.

Semrush is the better fit for teams wanting a broad, established SEO suite. Similarweb SERP Seismometer is the better fit for free desktop and mobile SERP volatility monitoring.

Semrush fits best
Teams wanting a broad, established SEO suite
Similarweb SERP Seismometer fits best
Free desktop and mobile SERP volatility monitoring

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Side by side

Show only differences

Feature	Semrush 9.2/10 Visit ↗	Similarweb SERP Seismometer 8.6/10 Visit ↗
At a glance
Editor score	9.2	8.6
Ranking	#1 in Google Algorithm Tracking Tools	#4 in Google Algorithm Tracking Tools
Best for	Teams wanting a broad, established SEO suite	Free desktop and mobile SERP volatility monitoring
Pricing model	Free plan + paid	Free
Starting price	—	Free plan
Free plan	✓	✓
Free trial	7 days	—
Deployment	Cloud	Cloud
Platforms	Web	Web
Built for	Solo, Small business, Mid-market, Enterprise	Solo, Small business, Mid-market, Enterprise
Features Semrush 0/3 · Similarweb SERP Seismometer 1/3
Update alerts	Not checked yet	Not checked yet
Volatility index	Not checked yet	✓ (best)
SERP feature tracking	Not checked yet	Not checked yet
Specs
Location views	Not checked yet	Not checked yet
Device views	Not checked yet	Both
History retention	Not checked yet	Not checked yet
Our review
Pros	Tracks rankings daily across locations, devices, and search engines Combines keyword, competitor, backlink, and technical site research Connects with Google Analytics, Search Console, Ads, and other platforms	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
Cons	Free access is limited to one demo project and 10 reports per day Historical data and multi-location and device tracking require Pro+ Advanced API integration and automation sit in the Advanced plan	Does not track individual site rankings Focuses on volatility rather than broader SEO work Available as a web tool, with cloud deployment
Our verdict	Semrush brings rank tracking together with keyword research, competitor analysis, backlink analysis, site auditing, content optimization, and reporting. Its cloud-based platform is aimed at freelancers, businesses, agencies, and larger… Read the review →	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 →

SemrushGoogle Algorithm Tracking Tools 9.2Free plan · 7-day trial
S Similarweb SERP SeismometerGoogle Algorithm Tracking Tools 8.6Free plan

Compare the top tools in

Strengths and trade-offs

Semrush — where it wins
- Tracks rankings daily across locations, devices, and search engines
- Combines keyword, competitor, backlink, and technical site research
- Connects with Google Analytics, Search Console, Ads, and other platforms
Where it doesn't
- Free access is limited to one demo project and 10 reports per day
- Historical data and multi-location and device tracking require Pro+
- Advanced API integration and automation sit in the Advanced plan
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

Semrush9.2/10 · Free plan · 7-day trial
A broad SEO suite for teams tracking rankings alongside wider search performance.
Visit Semrush Full verdict →
Similarweb SERP Seismometer8.6/10 · Free plan
A free, focused way to monitor Google ranking turbulence across desktop and mobile.
Visit Similarweb Full verdict →

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Reviewed by iTechGuides Editors · Editorial team · Updated Nov 2026

Last updated 14 Nov 2026 · How we research and update