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Technologies / Cloudflare / Fastmail

Companies using Cloudflare and Fastmail

15 companies in our data have public evidence for both Cloudflare and Fastmail, and 6 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.

15companies use both
under 1%of Cloudflare users
100%of Fastmail users
6name both as subprocessors

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

CompanyCloudflareFastmail
draw.io
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
RenderFormrenderform.ioRenderForm is a graphics editor for designing templates that automate repetitive image, PDF, or video creation.Design and creativeDeveloper tools
Sendmarcsendmarc.comSendmarc provides a platform for managing DMARC, SPF, and DKIM email authentication across domains.Cybersecurity
SimpleLocalizesimplelocalize.ioSimpleLocalize provides a web-based translation editor and platform for managing translations and automating localization workflows for software projects.Developer tools
AccountsPortalaccountsportal.comAccountsPortal provides online accounting software for managing invoicing, books, and accounts.Finance and accounting software
Auth57 Labsauth57.ioAuth57 provides verified prior-authorization rule data for drugs, procedures, and services across all 51 states.Healthcare
Auth57 Labsauth57labs.comAuth57 provides verified prior authorization rule data for drugs, procedures, and services across all 51 states.Healthcare
Healthchecks.ioHealthchecks.io monitors cron jobs and scheduled tasks by alerting users when expected pings do not arrive on time.Developer tools
Stadia Mapsstadiamaps.comStadia Maps provides map, geocoding, and routing APIs for developers.Developer tools
Fathom Analyticsusefathom.comFathom provides website analytics software that shows where visitors come from, which pages they read, and what converts without using cookies.Data and analytics
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.
ipapi.co

The two technologies

Cloudflare

Cloud and infrastructure

Cloudflare is a platform for building, securing, and scaling applications, agents, and workforce workloads without managing infrastructure. It is used to run security, connectivity, and code on a global network close to users, applications, and sites.

Summarized from cloudflare.com on 8 Nov 2026.

under 1% of the 22,748 companies we see using Cloudflare also show the other.

All 22,748 companies using Cloudflare2,114 name it as a subprocessorMore in Cloud and infrastructure

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.

100% 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

Industries

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

Developer tools4Cybersecurity3Healthcare2

Other pairs

Companies with their own evidence for both.

More with Cloudflare

Google Workspace14,000companiesGoogle Tag Manager9,024companiesGoogle Analytics8,087companiesNext.js6,232companiesAmazon Web Services5,253companiesVercel4,705companies

More with Fastmail

Stripe9companiesAmazon Web Services6companiesAnthropic6companiesHetzner6companiesGoogle5companiesPaddle5companies

Questions

How many companies use both Cloudflare and Fastmail?

15 companies in StrataDB's data have public evidence for both, and 6 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 Cloudflare and Fastmail?

draw.io, isotope¹³, isotope¹³, RenderForm and Sendmarc, and 10 more companies. Each one links to the evidence behind it.

How does StrataDB know a company uses Cloudflare and Fastmail?

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 Cloudflare and Fastmail

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