In terms of market share, Fathom SEO is clearly lagging behind, losing to WordStream in all segments.
WordStream has better usage coverage in more websites categories. Including Business & Industry, People & Society, Relationships & Dating, Autos & Vehicles and 55 other categories.
Fathom SEO is leading in Senior Health, Industrial Goods & Services, Consumer Electronics, Fitness and 2 other categories.
WordStream is leading in most countries, including United States, United Kingdom, Canada, Mexico and 12 other countries.
Fathom SEO is leading in Netherlands, Nigeria and Brazil.