Similarweb
Web traffic and digital market intelligence
4.2FreemiumBest for Diligence on consumer, marketplace, and web-first startups
Alt Data Traffic Diligence
Overview
Similarweb measures website traffic, engagement, and audience behavior across the internet, making it a standard reference for digital market intelligence. Venture investors use it to sanity-check a consumer or marketplace startup's claimed traction, benchmark targets against competitors, and size digital categories from the demand side. Traffic estimates on smaller sites carry error bars, but directionally it remains one of the fastest ways to see whether a company's growth story shows up in the data.
Key features
- Website traffic and engagement estimates
- Traffic source and channel breakdowns
- Competitor and category benchmarking
- Audience and geography analysis
- Keyword and search intelligence
- API access on higher tiers
Pros
- Fast, independent check on digital traction
- Broad coverage of consumer and marketplace categories
- Free tier is enough for quick diligence checks
Cons
- Estimates get noisy on low-traffic sites
- Less relevant for developer tools and B2B infrastructure