In terms of market share, Fathom SEO is clearly lagging behind, losing to Vertical Leap in all segments.
Fathom SEO has better usage coverage in more websites categories. Including Business & Industry, Senior Health, Health, Computer & Electronics and 20 other categories.
Vertical Leap hasn't got a lead over Fathom SEO in any websites category.
Fathom SEO is leading in most countries, including United States, India, Canada, Hong Kong and one other country.
Vertical Leap is leading in United Kingdom.