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Technologies / Coresite / Customer.io

Companies using Coresite and Customer.io

2 companies in our data have public evidence for both Coresite and Customer.io, and 2 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.

2companies use both
40%of Coresite users
1%of Customer.io users
2name 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

CompanyCoresiteCustomer.io
Namespacenamespace.soNamespace provides cloud instances for macOS, Windows, and Linux, along with Devboxes, GitHub Actions runners, and Bazel remote execution.Cloud and infrastructureDeveloper tools
SMTP2GOsmtp2go.comSMTP2GO is an outgoing email delivery service that sends and tracks emails and provides reports on delivery, bounces, and spam complaints.Communications

The two technologies

Coresite

Cloud and infrastructure

CoreSite is a provider of data centers and colocation services. It is used for scalable space, reliable power and high-performance interconnection across U.S. markets.

Summarized from coresite.com on 9 Nov 2026.

40% of the 5 companies we see using Coresite also show the other.

All 5 companies using Coresite5 name it as a subprocessorMore in Cloud and infrastructure

Customer.io

Email and communications

Customer.io is a customer engagement platform that unifies customer data, messaging, and AI in one place. It is used to send personalized messages across channels and to automate campaigns that aim to improve conversion, retention, and revenue.

Summarized from customer.io on 8 Nov 2026.

1% of the 244 companies we see using Customer.io also show the other.

All 244 companies using Customer.io198 name it as a subprocessorMore in Email and communications

Other pairs

Companies with their own evidence for both.

More with Coresite

Amazon Web Services5companiesCloudflare5companies

More with Customer.io

Cloudflare243companiesGoogle Workspace218companiesAmazon Web Services177companiesStripe171companiesGoogle Analytics126companiesOpenAI123companies

Questions

How many companies use both Coresite and Customer.io?

2 companies in StrataDB's data have public evidence for both, and 2 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 Coresite and Customer.io?

Namespace and SMTP2GO. Each one links to the evidence behind it.

How does StrataDB know a company uses Coresite and Customer.io?

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 Coresite and Customer.io

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