This page is kept as a narrow support reference from the older GTM Stack corpus. It can still be useful for one-off operator questions, but it is not one of the curated flagship entries. Start from the curated question set if you want stronger workflow guidance.
The big difference in TAM company counts between Clay and Apollo, even with the same filters, is likely due to differences in data sources and how each platform aggregates and updates company data. Clay combines data from over 100 providers and uses its own cleaning methods, while Apollo relies on its own dataset. Clay’s data is refreshed in real time or at least every 3 months, but the actual coverage and accuracy can vary by provider. This means each platform may include or exclude companies differently, leading to different counts even with identical filters. clay.com clay.com