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Technologies / HubSpot / Mailersend

Companies using HubSpot and Mailersend

8 companies in our data have public evidence for both HubSpot and Mailersend, and 7 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.

8companies use both
under 1%of HubSpot users
29%of Mailersend users
7name both as subprocessors

Companies using one are 1.6 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

CompanyHubSpotMailersend
BuchhaltungsButlerbuchhaltungsbutler.deBuchhaltungsButler provides cloud-based accounting software with automated bookkeeping, document management, and bank account connections.Finance and accounting software
ComplyDogcomplydog.comComplyDog provides GDPR compliance software that sets up a compliance portal, automates DPA signing, and handles data requests.Compliance and risk
Curiositycuriosity.aiCuriosity builds internal software and AI agents from plain-language descriptions, grounded in a company's connected data and existing permissions.AI and machine learning
curiocuriosity.shCuriosity provides a command line tool called curio that connects to Curiosity Studio, giving users a two-panel terminal interface to edit, build, commit and approve workspace configuration files.Developer tools
Essential Assessmentessentialassessment.com.auEssential Assessment provides curriculum-aligned mathematics and English assessments and resources for schools.Education
Schmeits websolutionsschmeits.comSchmeits builds custom software, websites and platforms, system integrations, and provides AI consultancy.Consulting and services
Tebitebi.comTebi provides a connected system for hospitality operations that links reservations, POS, kitchen display, payments, and inventory with back-office admin.Food and restaurants
AutoMQautomq.comAutoMQ provides a diskless, Kafka-compatible streaming platform that runs on cloud object storage.Cloud and infrastructure

The two technologies

HubSpot

CRM and sales

HubSpot is a customer platform that brings together marketing, sales, and customer service software on one agentic platform. It is used for marketing automation, sales, customer service, content marketing, data management, and billing and payments.

Summarized from hubspot.com on 8 Nov 2026.

under 1% of the 4,280 companies we see using HubSpot also show the other.

All 4,280 companies using HubSpot1,138 name it as a subprocessorMore in CRM and sales

Mailersend

Email and communications

Mailersend is a transactional email API and SMTP service that lets developers send reliable email, SMS and WhatsApp messages from their applications. It is used to deliver critical messages such as order confirmations, notifications, password resets and one-time passcodes at scale.

Summarized from mailersend.com on 8 Nov 2026.

29% of the 28 companies we see using Mailersend also show the other.

All 28 companies using Mailersend26 name it as a subprocessorMore in Email and communications

Other pairs

Companies with their own evidence for both.

More with HubSpot

Cloudflare4,208companiesGoogle Workspace3,065companiesGoogle Tag Manager2,813companiesGoogle Analytics1,934companiesAmazon Web Services1,702companiesWebflow1,155companies

More with Mailersend

Cloudflare28companiesStripe19companiesGoogle Workspace17companiesGoogle15companiesGoogle Analytics14companiesOpenAI11companies

Questions

How many companies use both HubSpot and Mailersend?

8 companies in StrataDB's data have public evidence for both, and 7 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 HubSpot and Mailersend?

BuchhaltungsButler, ComplyDog, Curiosity, curio and Essential Assessment, and 3 more companies. Each one links to the evidence behind it.

How does StrataDB know a company uses HubSpot and Mailersend?

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 HubSpot and Mailersend

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