How many companies use Retarus?
As of October 2026, 388 companies show public evidence of using Retarus across the 1,791,079 company domains runsonwhat tracks. That makes Retarus the 110th most used of the 156 Security & Compliance tools with confirmed customers, behind AccessiWay (395). The number is a lower bound: a company counts only when a public record, such as a DNS entry or Retarus' code on its website, shows the tool in use.
Which companies use Retarus?
Companies that use Retarus include Hornbach, Adagia Partners, Ärzteversorgung Westfalen-Lippe, AFD and Apceth Biopharma (Germany), according to runsonwhat's public-record scans (October 2026). The biggest industries among Retarus customers are chemicals (7.7%) and retail (7.1%). The full list of 388 companies can be filtered by industry, company size and country on runsonwhat's Retarus page.
What industries use Retarus the most?
The industries with the most Retarus customers are chemicals (7.7%), retail (7.1%) and automotive (6.6%), based on the 183 companies with a known industry.
Is Retarus more popular with startups or large companies?
Retarus is used mostly by mid-size companies: of the 284 companies with a known size, 26% have up to 50 employees, 47% have 51 to 1,000 and 26% have more than 1,000. Compared with all companies runsonwhat tracks, Retarus is 11× as common among companies with 10,000+ employees.
Which countries use Retarus the most?
Most Retarus customers runsonwhat has found are based in Germany (65%), Austria (6.0%) and France (5.4%), out of 334 companies with a known country.
Is Retarus gaining or losing customers?
In the 90 days to October 2026, 95 companies started using Retarus and 0 companies stopped, a net gain of 95. runsonwhat counts a start or a stop only between two checks of the same company done the same way, so a change in how a site is scanned never shows up as churn.
What are the most popular alternatives to Retarus?
By the number of companies using them, the most used Security & Compliance tools other than Retarus are reCAPTCHA (252,849), Cookiebot (61,268), Let's Encrypt (54,482) and GlobalSign (53,487), according to runsonwhat (October 2026). Not every tool in a category does the same job, so check each one's page; runsonwhat ranks all Security & Compliance tools at https://www.runsonwhat.com/tools/security-compliance.
What other tools do Retarus customers use?
Retarus customers use Haufe umantis, SwissSign and CleverReach far more often than the average company. For example, 3.1% of Retarus customers also run Haufe umantis, 69× the rate among all companies runsonwhat tracks, and 11% run SwissSign.
How does runsonwhat know a company uses Retarus?
runsonwhat reads public records only. For Retarus, that means email records (SPF, MX or DKIM) that authorize Retarus or Retarus on the company's own subprocessor list. A company is listed only when one of these direct records is present, and each match keeps the record it came from. DNS is rechecked weekly and websites about monthly.
Haufe umantisPeople & HR69×more likely
SwissSignSecurity & Compliance42×more likely
CleverReachMarketing24×more likely
UsercentricsSecurity & Compliance17×more likely
SAP SuccessFactorsPeople & HR14×more likely
TeamViewerDev Tools13×more likely
Adobe Experience ManagerWebsite & CMS10×more likely
MiroCollaboration7.9×more likely
WebexCollaboration7.0×more likely
MatomoAnalytics5.4×more likely
AtlassianDev Tools3.8×more likely
Apple BusinessWorkspace2.9×more likely