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, Fitness, Beauty & Fitness and one other category.
WordStream is leading in most countries, including United States, United Kingdom, India, Mexico and 12 other countries.
Fathom SEO is leading in Finland, Japan, New Zealand, Philippines and one other country.