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Technologies / Justworks / Slack

Companies using Justworks and Slack

2 companies in our data have public evidence for both Justworks and Slack, 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 Justworks users
under 1%of Slack 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

CompanyJustworksSlack
Centimentcentiment.coCentiment provides an audience panel for finding survey respondents and a survey platform for creating and managing surveys.Marketing
Threadgetthread.comThread provides an AI service desk that automates triage, dispatch, and client conversations across ConnectWise, Autotask, and HaloPSA.AI and machine learningCustomer support

The two technologies

Justworks is an HR platform for small businesses. It is used for payroll, benefits, compliance, and HR support.

Summarized from justworks.com on 8 Nov 2026.

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

All 5 companies using Justworks5 name it as a subprocessorMore in HR

Slack

by Salesforce · Productivity

Slack is a collaboration platform where teams chat, share files, and work together in channels. It is used for team communication, connecting apps and agents, and automating everyday work.

Summarized from slack.com on 8 Nov 2026.

under 1% of the 1,949 companies we see using Slack also show the other.

All 1,949 companies using Slack1,355 name it as a subprocessorMore in Productivity

Other pairs

Companies with their own evidence for both.

More with Justworks

Cloudflare5companies

More with Slack

Cloudflare1,834companiesGoogle Workspace1,598companiesAmazon Web Services1,312companiesStripe906companiesGoogle Tag Manager887companiesGoogle821companies

Questions

How many companies use both Justworks and Slack?

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 Justworks and Slack?

Centiment and Thread. Each one links to the evidence behind it.

How does StrataDB know a company uses Justworks and Slack?

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 Justworks and Slack

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