Proton Mail
44,535 sites detectedWebmail · #7 of 13Updated October 2026
Companies using Proton Mail
| # | Company | Industry | Location | First seen | Evidence |
|---|---|---|---|---|---|
| 1 | Cybersecurity | Plan-les-Ouates, CH | Apr 2026 | MX record | |
| 2 | Marketing & Sales Tech | – | Apr 2026 | MX record | |
| 3 | Healthcare & Life Sciences | Belle Fourche, US | Sept 2026 | MX record | |
| 4 | Education & Learning | Prague, CZ | Apr 2026 | MX record | |
| 5 | Financial Services & Fintech | – | Sept 2026 | MX record | |
| 6 | Professional Services | – | Apr 2026 | MX record | |
| 7 | Professional Services | – | Sept 2026 | MX record | |
| 8 | Professional Services | – | Sept 2026 | MX record | |
| 9 | Media & Content | AU | Apr 2026 | MX record | |
| 10 | Media & Content | – | Apr 2026 | MX record |
See all 44,535 sites detected using Proton Mail
Showing 10 of 44,535 sites detected. The customer list has every company, the new customers this month, filters and downloads.
Who uses Proton Mail
New customers per week
Companies we saw start using it, from 21 September 2026.
By sector
44% of 134 sampled customers have a known sector.
By country
Country is known for 9% of 134 sampled customers.
Also used by these customers
Share of sampled Proton Mail customers running each tool.
Webmail: share by companies
Proton Mail is #7 of 13, with 0% of companies running a tool in this category.
How we found them
Share of sampled customers by where the evidence was.
Every company in the list shows which kind of evidence we found and when. Data quality
Every company using Proton Mail
The customer list shows who they are, the evidence for each one and who started this month.