Fathom Analytics vs Similarweb
Which one do AI engines recommend, and how do they differ on price, fit and features?
The short answer
Fathom Analytics is the stronger AI pick in Web Analytics: it has a visibility score of 14.6 versus 7.2 for Similarweb, and ranks ahead in 100% of the answers that name both.
Choose Fathom Analytics if…
- You want the brand AI engines rank higher (14.6 vs 7.2)
- AI answers describe it more positively (50% vs 0% positive)
- You need GDPR or CCPA or ePrivacy or PECR coverage
- Usage-based pricing suits your budget better than flat tiers
Choose Similarweb if…
- You need ISO/IEC 27001:2022 or SOC 2 Type 2 or SOC 3 coverage
- You prefer a larger, established vendor (1,001–5,000 employees)
- Flat tiers pricing suits your budget better than usage-based
- competitive web traffic analysis and market intelligence
AI visibility side by side
Latest weekly run · Nov 2
| Metric | Fathom Analytics | Similarweb |
|---|---|---|
| Visibility score | 14.6% | 7.2% |
| Change vs last week | New | New |
| Rank in Web Analytics | #8 | #12 |
| Share of voice | 4% | 2.5% |
| Mentions this run | 20 | 13 |
| Positive in AI answers | 50% | 0% |
The stronger value in each row is marked with a ✓.
Visibility score trend
Weekly runs over the last 60 days
Fathom Analytics 0pp · Similarweb 0pp over 0 weekly runs.
Engine by engine
Fathom Analytics leads on 2 of 3 engines
Head to head in AI answers
2 engine answers name both brands
| Prompt | Engine | Fathom Analytics | Similarweb |
|---|---|---|---|
| Compare the leading Web Analytics platforms | Perplexity | #10 | #12 |
| Which Web Analytics tools offer annual discounts? | Perplexity | #2 | #11 |
Features, pricing & fit
| Dimension | Fathom Analytics | Similarweb |
|---|---|---|
| Pricing model | Usage-based | Flat tiers |
| Entry price | $15 / mo | Contact sales |
| Free plan | No · 7-day trial | No |
| Deployment | Hosted software-as-a-service | — |
| Compliance | GDPR, CCPA, ePrivacy, PECR | ISO/IEC 27001:2022, SOC 2 Type 2, SOC 3 |
| Support | Email support, Help centre | Email support (support@similarweb.com), Dedicated enterprise support, Sales chat |
| Founded | 2018 | 2009 |
| Headquarters | Victoria, British Columbia, Canada | New York, NY, United States |
| Employees | 1–10 | 1,001–5,000 |
| Funding | Bootstrapped | IPO (NYSE) · $240M raised |
| Best for | European companies and agencies that want website analytics without cookies or personal data collection. | Marketers, researchers, and SEO and PPC teams |
Plans side by side
Fathom Analytics
Pros and cons
Themes from the AI answers that mention each brand
Fathom Analytics
- privacy-focused, cookie-free analytics
- simple dashboard and simple metrics
- fast and reliable
- predictable flat-rate pricing based on pageviews
- lightweight tool suited to small sites
Similarweb
- competitive web traffic analysis and market intelligence
- cross-domain traffic sourcing and market share benchmarking
- competitor benchmarking and market research
- free trial and limited free version
- not suited to precise first-party conversion measurement
- ranked behind Google Analytics and Amplitude in one comparison
Data collected ·ChatGPT, Perplexity, Google AI Mode·coverage 100%·next run
Cite as: SlateIndex, “Fathom Analytics vs Similarweb”, https://slateindex.ai/compare/fathom-analytics-vs-similarweb, data of Nov 2, 2026. Licence: CC BY 4.0.