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Technologies / Fastmail / Stripe

Companies using Fastmail and Stripe

9 companies in our data have public evidence for both Fastmail and Stripe, 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.

9companies use both
60%of Fastmail users
under 1%of Stripe users
6name both as subprocessors

Companies using one are 3.2 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

CompanyFastmailStripe
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
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
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
Stadia Mapsstadiamaps.comStadia Maps provides map, geocoding, and routing APIs for developers.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
ipapi.co

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.

60% 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

Stripe

Payments

Stripe is financiële infrastructuur om omzet te laten groeien. Het wordt gebruikt om betalingen te ontvangen, financiële diensten aan te bieden en eigen verdienmodellen te implementeren.

Summarized from stripe.com on 8 Nov 2026.

under 1% of the 4,419 companies we see using Stripe also show the other.

All 4,419 companies using Stripe2,845 name it as a subprocessorMore in Payments

Industries

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

Healthcare2Cybersecurity2

Other pairs

Companies with their own evidence for both.

More with Fastmail

Cloudflare15companiesAmazon Web Services6companiesAnthropic6companiesHetzner6companiesGoogle5companiesPaddle5companies

More with Stripe

Cloudflare4,411companiesGoogle Workspace3,001companiesAmazon Web Services2,026companiesGoogle1,935companiesGoogle Analytics1,760companiesNext.js1,700companies

Questions

How many companies use both Fastmail and Stripe?

9 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 Fastmail and Stripe?

AccountsPortal, Auth57 Labs, Auth57 Labs, isotope¹³ and isotope¹³, and 4 more companies. Each one links to the evidence behind it.

How does StrataDB know a company uses Fastmail and Stripe?

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 Stripe

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