# Companies that use Retarus

As of October 2026, 388 companies show public evidence of using Retarus (Email security and enterprise messaging), according to runsonwhat.

- Tool: [Retarus](https://retarus.com), category [Security & Compliance](https://www.runsonwhat.com/tools/security-compliance)
- Companies using it now: 388
- Stopped using it (seen on a same-method rescan): 0
- Started in the last 30 days: 83

## Who uses Retarus

Segments where Retarus customers are more common than among all companies we track:

- 10,000+ employees: 11× more likely (24 customers)
- 1,001–5,000 employees: 5.5× more likely (44 customers)
- 201–1,000 employees: 2.4× more likely (73 customers)

## Retarus customers by industry

| Industry | Share of customers |
|---|---|
| Chemicals | 7.7% |
| Retail | 7.1% |
| Automotive | 6.6% |
| Electrical/electronic Manufacturing | 6.0% |
| Financial Services | 6.0% |
| Management Consulting | 6.0% |
| Building Materials | 4.9% |
| IT Services | 4.9% |

## Retarus customers by company size

| Company size | Share of customers |
|---|---|
| 1–10 employees | 2.1% |
| 11–50 employees | 24% |
| 51–200 employees | 21% |
| 201–1,000 employees | 26% |
| 1,001–5,000 employees | 15% |
| 5,001–10,000 employees | 2.5% |
| 10,000+ employees | 8.5% |

## Retarus customers by country

| Country | Share of customers |
|---|---|
| Germany | 65% |
| Austria | 6.0% |
| France | 5.4% |
| Spain | 3.9% |
| Switzerland | 3.0% |
| United States | 2.4% |
| Czechia | 2.1% |
| Italy | 1.8% |

## Alternatives to Retarus

| Tool | Companies |
|---|---|
| [reCAPTCHA](https://www.runsonwhat.com/reverse/recaptcha) | 251,339 |
| [Cookiebot](https://www.runsonwhat.com/reverse/cookiebot) | 60,987 |
| [Let's Encrypt](https://www.runsonwhat.com/reverse/letsencrypt) | 54,378 |
| [GlobalSign](https://www.runsonwhat.com/reverse/globalsign) | 53,355 |
| [CookieYes](https://www.runsonwhat.com/reverse/cookieyes) | 49,296 |
| [Proofpoint](https://www.runsonwhat.com/reverse/proofpoint) | 48,235 |
| [Sectigo](https://www.runsonwhat.com/reverse/sectigo) | 38,967 |
| [DigiCert](https://www.runsonwhat.com/reverse/digicert) | 35,835 |
| [Google Trust Services](https://www.runsonwhat.com/reverse/google-trust) | 34,791 |
| [Valimail](https://www.runsonwhat.com/reverse/valimail) | 32,006 |

## Retarus customers also use

- [Haufe umantis](https://www.runsonwhat.com/reverse/umantis): 3.2% of Retarus customers, 69× the average company
- [SwissSign](https://www.runsonwhat.com/reverse/swisssign): 11% of Retarus customers, 42× the average company
- [CleverReach](https://www.runsonwhat.com/reverse/cleverreach): 6.9% of Retarus customers, 24× the average company
- [Usercentrics](https://www.runsonwhat.com/reverse/usercentrics): 15% of Retarus customers, 17× the average company
- [SAP SuccessFactors](https://www.runsonwhat.com/reverse/sap-successfactors): 3.7% of Retarus customers, 14× the average company
- [TeamViewer](https://www.runsonwhat.com/reverse/teamviewer): 4.8% of Retarus customers, 13× the average company
- [Adobe Experience Manager](https://www.runsonwhat.com/reverse/adobe-aem): 3.5% of Retarus customers, 10× the average company
- [Miro](https://www.runsonwhat.com/reverse/miro): 6.9% of Retarus customers, 7.9× the average company
- [Webex](https://www.runsonwhat.com/reverse/webex): 9.3% of Retarus customers, 7.0× the average company
- [Matomo](https://www.runsonwhat.com/reverse/matomo): 14% of Retarus customers, 5.4× the average company

## Companies that use Retarus (first 40 of 388)

| Company | Domain | Industry | Country |
|---|---|---|---|
| [Hornbach](https://www.runsonwhat.com/company/hornbach.de) | hornbach.de | Retail | Germany |
| [Adagia Partners](https://www.runsonwhat.com/company/adagiapartners.com) | adagiapartners.com | Venture Capital & Private Equity | France |
| [Ärzteversorgung Westfalen-Lippe](https://www.runsonwhat.com/company/aevwl.de) | aevwl.de | Insurance | Germany |
| [AFD](https://www.runsonwhat.com/company/afd.fr) | afd.fr |  |  |
| [Apceth Biopharma (Germany)](https://www.runsonwhat.com/company/apceth.com) | apceth.com |  | Germany |
| [Assist Notfallservice GmbH](https://www.runsonwhat.com/company/assist.at) | assist.at | Consumer Services | Austria |
| [Baerlocher India](https://www.runsonwhat.com/company/baerlocher.com) | baerlocher.com | Chemicals | India |
| [Barum](https://www.runsonwhat.com/company/barum-online.com) | barum-online.com | Tire Manufacturer | Czechia |
| [BayBG](https://www.runsonwhat.com/company/baybg.de) | baybg.de | Financial Services | Germany |
| [Bayerischer Bauernverband](https://www.runsonwhat.com/company/bayerischerbauernverband.de) | bayerischerbauernverband.de | Farming | Germany |
| [Baymag](https://www.runsonwhat.com/company/baymag.com) | baymag.com | Mining & Metals | Canada |
| [Bbv-LandSiedlung](https://www.runsonwhat.com/company/bbv-ls.de) | bbv-ls.de | Individual & Family Services | Germany |
| [Bergader Privatkäserei](https://www.runsonwhat.com/company/bergader.de) | bergader.de |  | Germany |
| [SozialFactoring](https://www.runsonwhat.com/company/bfs-service.de) | bfs-service.de | Financial Services | Germany |
| [Bright Future](https://www.runsonwhat.com/company/brightfuture.de) | brightfuture.de | Video Games | Germany |
| [Bayerisches Zentrum Für Krebsforschung (bzkf)](https://www.runsonwhat.com/company/bzkf.de) | bzkf.de | Healthcare | Germany |
| [Centre Léon Bérard](https://www.runsonwhat.com/company/centreleonberard.fr) | centreleonberard.fr | Healthcare | France |
| [CJD - das Bildungs- und Sozialunternehmen](https://www.runsonwhat.com/company/cjd.de) | cjd.de | Civic & Social Organization | Germany |
| [Adc Automotive Distance Control Systems GmbH](https://www.runsonwhat.com/company/conti-online.com) | conti-online.com |  | Germany |
| [City Zone Express Sdn Bhd](https://www.runsonwhat.com/company/czone.com.my) | czone.com.my | Logistics and Supply Chain | Malaysia |
| [Degiro](https://www.runsonwhat.com/company/degiro.es) | degiro.es |  |  |
| [Degiro](https://www.runsonwhat.com/company/degiro.nl) | degiro.nl |  |  |
| [Depesche Vertrieb GmbH & Co. Kg](https://www.runsonwhat.com/company/depesche.com) | depesche.com | Wholesale | Germany |
| [Deutsche See Fischmanufaktur](https://www.runsonwhat.com/company/deutschesee.de) | deutschesee.de |  | Germany |
| [DIEFFENBACHER GmbH Maschinen- und Anlagenbau](https://www.runsonwhat.com/company/dieffenbacher.com) | dieffenbacher.com | Plant Engineering | Germany |
| [Distripark.com](https://www.runsonwhat.com/company/distripark.com) | distripark.com | Chemicals | Poland |
| [Dreidoppel GmbH](https://www.runsonwhat.com/company/dreidoppel.de) | dreidoppel.de | Food Production | Germany |
| [Dupon Nederland BV](https://www.runsonwhat.com/company/dupon.nl) | dupon.nl | Consumer Goods | Netherlands |
| [Ebner & Spiegel](https://www.runsonwhat.com/company/ebnerpublishing.com) | ebnerpublishing.com |  | Germany |
| [Ehrmann](https://www.runsonwhat.com/company/ehrmann.com) | ehrmann.com | Food Production | Russia |
| [Ehrmann AG](https://www.runsonwhat.com/company/ehrmann.de) | ehrmann.de |  | Germany |
| [Premedia GmbH](https://www.runsonwhat.com/company/elanyo.com) | elanyo.com | Management Consulting | Germany |
| [Endlich GmbH & Co. Kg](https://www.runsonwhat.com/company/endlich.it) | endlich.it | IT Services | Germany |
| [Neo – New Event Order](https://www.runsonwhat.com/company/event-partner.de) | event-partner.de | Publishing | Germany |
| [Feuerwehrmagazin](https://www.runsonwhat.com/company/feuerwehrmagazin.de) | feuerwehrmagazin.de |  |  |
| [FinTech Group](https://www.runsonwhat.com/company/fintechgroup.com) | fintechgroup.com | Fintech | Germany |
| [Flatex](https://www.runsonwhat.com/company/flatex.at) | flatex.at |  |  |
| [Flatex](https://www.runsonwhat.com/company/flatex.de) | flatex.de |  |  |
| [Flatexdegiro](https://www.runsonwhat.com/company/flatexdegiro.com) | flatexdegiro.com |  | Germany |
| [Fleetpartner](https://www.runsonwhat.com/company/fleetpartner.fr) | fleetpartner.fr | Automotive | France |

The full list is on https://www.runsonwhat.com/reverse/retarus for signed-in users.

## FAQ

### How many companies use Retarus?

As of October 2026, 388 companies show public evidence of using Retarus across the 1,791,201 company domains runsonwhat tracks. That makes Retarus the 110th most used of the 156 Security & Compliance tools with confirmed customers, behind Riot (397). 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 (260,605), Cookiebot (62,855), Let's Encrypt (54,511) and GlobalSign (53,500), 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.


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Source: runsonwhat, https://www.runsonwhat.com/reverse/retarus (updated October 2026). Counts are companies with direct public evidence of the tool (DNS records, certificates, website code, a real-browser crawl, subprocessor lists), so they are lower bounds. Methodology: https://www.runsonwhat.com/methodology.