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Technologies / Fastmail / Hetzner

Companies using Fastmail and Hetzner

6 companies in our data have public evidence for both Fastmail and Hetzner, and 4 name both in their own subprocessor list. Each company below links to the source for every claim. Our coverage is partial, so this is not everyone.

6companies use both
40%of Fastmail users
1%of Hetzner users
4name both as subprocessors

Companies using one are 18 times as likely as the average company in our data to show evidence of the other.

The companies

Strongest evidence first: a company naming both in its own subprocessor list comes before one seen on its website or in job postings.

Subprocessor listPrivacy policyWebsiteJob postings

CompanyFastmailHetzner
Healthchecks.ioHealthchecks.io monitors cron jobs and scheduled tasks by alerting users when expected pings do not arrive on time.Developer tools
isotope¹³isotope13.aiisotope¹³ sells supply-chain attack detection software that scans source code, binaries, firmware, containers and packages for malicious code.Cybersecurity
isotope¹³isotope13.ioisotope¹³ sells supply-chain attack detection software that identifies malicious code in source, binaries, firmware, containers and packages at scan time.Cybersecurity
SimpleLocalizesimplelocalize.ioSimpleLocalize provides a web-based translation editor and platform for managing translations and automating localization workflows for software projects.Developer tools
Dimantikadimantika.comDimantika is a product studio in Gdańsk, Poland that builds AI-assisted software for repetitive, high-friction workflows.AI and machine learning
Kirbygetkirby.comKirby is a content management system that stores content in simple text files and folders.

The two technologies

Fastmail

Email and communications

Fastmail is a paid email hosting service offering email, calendar, and contacts, with options for private email addresses and offline access. It is used by individuals and businesses to send, receive, organize, and manage email, calendars, and contacts across devices.

Summarized from fastmail.com on 8 Nov 2026.

40% of the 15 companies we see using Fastmail also show the other.

All 15 companies using Fastmail12 name it as a subprocessorMore in Email and communications

Hetzner

Cloud and infrastructure

Hetzner is a hosting provider that offers dedicated servers, cloud servers, managed servers, web hosting, and storage products. It is used for hosting websites, applications, and IT infrastructure.

Summarized from hetzner.com on 8 Nov 2026.

1% of the 521 companies we see using Hetzner also show the other.

All 521 companies using Hetzner419 name it as a subprocessorMore in Cloud and infrastructure

Industries

Among the companies above, by our own classification of their homepage.

Developer tools2Cybersecurity2

Other pairs

Companies with their own evidence for both.

More with Fastmail

Cloudflare15companiesStripe9companiesAmazon Web Services6companiesAnthropic6companiesGoogle5companiesPaddle5companies

More with Hetzner

Cloudflare520companiesStripe292companiesGoogle258companiesGoogle Workspace217companiesOpenAI166companiesAmazon Web Services162companies

Questions

How many companies use both Fastmail and Hetzner?

6 companies in StrataDB's data have public evidence for both, and 4 of them name both in their own subprocessor list, the strongest evidence we hold. Our coverage is partial, so the real number is higher.

Which companies use Fastmail and Hetzner?

Healthchecks.io, isotope¹³, isotope¹³, SimpleLocalize and Dimantika, and 1 more company. Each one links to the evidence behind it.

How does StrataDB know a company uses Fastmail and Hetzner?

From four kinds of public evidence: subprocessor lists, privacy policies, website code and job postings. Each is kept apart with its source and the date we saw it. A company missing here means we found no evidence, not that it does not use them.

Find every company using Fastmail and Hetzner

See the full list with the source for each company, and run the same lookup for any technology from the API, Claude or your browser.

  • Every company and vendor, with its public source
  • 100 API calls a month, plus MCP and the Chrome extension
  • Work email only. No card, no sales call