2,358 companies use Proton Mail, as of October 2026.
Proton Mail: Encrypted email. We've found 2,358 companies using Proton Mail, most often in IT Services (21%) and Software (14%), typically with 11–50 employees and 41% based in United States.
Customers2,358companies use it
Most popular withInternational Affairs9.1× more likely than average
Typical customer11–50employees · mostly United States
We've found 2,358 companies using Proton Mail among the 608,504 we've scanned so far. We only count a company when a direct public record backs it up.
What kind of companies use Proton Mail?
Proton Mail customers are most often in IT Services (21%), Software (14%) and Financial Services (10%). The most common company size is 11–50 employees (64% of customers with a known size).
Which countries use Proton Mail the most?
Most Proton Mail customers we've found are in United States (41%), United Kingdom (9%) and Switzerland (6%).
What are the alternatives to Proton Mail?
The most used alternatives in the same category are Microsoft 365 (685,119 companies), Google Workspace (384,325 companies), Apple Business (107,133 companies) and Exclaimer (33,160 companies).
How does runsonwhat know a company uses Proton Mail?
We read public traces only. For Proton Mail that means a domain-verification record in the company's DNS, the company's email records (SPF, MX, DKIM) and the company's published subprocessor list. Every match keeps the record it came from.