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Technologies / Customer.io / Dragonfly Cloud

Companies using Customer.io and Dragonfly Cloud

4 companies in our data have public evidence for both Customer.io and Dragonfly Cloud, 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.

4companies use both
2%of Customer.io users
80%of Dragonfly Cloud users
4name 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

CompanyCustomer.ioDragonfly Cloud
Featurebasefeaturebase.appFeaturebase provides a support suite with a help desk, AI agent, help center, and feedback tools.Customer support
Hookdeckhookdeck.comHookdeck provides infrastructure for receiving, sending, and testing webhooks and external events.Developer tools
Smartleadsmartlead.aiSmartlead provides AI tools and email infrastructure for cold outreach, including email warmup, lead verification, and a unified inbox.AI and machine learningSales
Viktorviktor.comViktor is an AI employee that works inside Slack and Microsoft Teams and connects to other tools to complete work tasks.AI and machine learningProductivity and collaboration

The two technologies

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.

2% of the 250 companies we see using Customer.io also show the other.

All 250 companies using Customer.io203 name it as a subprocessorMore in Email and communications

Dragonfly Cloud is in-memory infrastructure for data-intensive caching, feature stores, job queues, and other real-time data workloads. It is API compatible with Redis, Valkey, and Memcached, which allows migration with minimal changes.

Summarized from dragonflydb.io on 8 Nov 2026.

80% of the 5 companies we see using Dragonfly Cloud also show the other.

All 5 companies using Dragonfly Cloud5 name it as a subprocessorMore in Data

Other pairs

Companies with their own evidence for both.

More with Customer.io

Cloudflare249companiesGoogle Workspace222companiesAmazon Web Services183companiesStripe175companiesGoogle Analytics128companiesOpenAI126companies

More with Dragonfly Cloud

Cloudflare5companiesGoogle Workspace5companiesSlack5companiesStripe5companies

Questions

How many companies use both Customer.io and Dragonfly Cloud?

4 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 Customer.io and Dragonfly Cloud?

Featurebase, Hookdeck, Smartlead and Viktor. Each one links to the evidence behind it.

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

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 Customer.io and Dragonfly Cloud

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