1,132 companies use Apollo.io, as of October 2026.
Apollo.io: Prospecting database. We've found 1,132 companies using Apollo.io, most often in Software (21%) and IT Services (16%), typically with 1–10 employees and 61% based in United States.
Customers1,132companies use it
Most popular withLegal69× more likely than average
Typical customer1–10employees · mostly United States
We've found 1,132 companies using Apollo.io among the 181,196 we've scanned so far. We only count a company when a direct public record backs it up.
What kind of companies use Apollo.io?
Apollo.io customers are most often in Software (21%), IT Services (16%) and B2B (9%). The most common company size is 1–10 employees (27% of customers with a known size).
Which countries use Apollo.io the most?
Most Apollo.io customers we've found are in United States (61%), United Kingdom (8%) and India (5%).
What are the alternatives to Apollo.io?
The most used alternatives in the same category are HubSpot (26,424 companies), Zoho (17,841 companies), Salesforce (15,346 companies) and Calendly (2,145 companies).
How does runsonwhat know a company uses Apollo.io?
We read public traces only. For Apollo.io that means the company's email records (SPF, MX, DKIM), a subdomain that points at Apollo.io, code loaded on the company's website, including tag managers and the company's published subprocessor list. Every match keeps the record it came from.
RB2BSales & CRM28×more likely
OneleetSecurity & Compliance19×more likely
G2Marketing19×more likely
MintlifySupport & Docs13×more likely
DealfrontSales & CRM12×more likely
ClerkAuth & Identity9.5×more likely
VantaSecurity & Compliance8.9×more likely
IntercomSupport & Docs8.3×more likely
PostHogAnalytics8.2×more likely
Reddit AdsAds & Pixels6.4×more likely
LinkedIn Insight TagAds & Pixels5.1×more likely
llms.txtAI2.6×more likely