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Technologies / Slack / Userlist

Companies using Slack and Userlist

6 companies in our data have public evidence for both Slack and Userlist, 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.

6companies use both
under 1%of Slack users
46%of Userlist users
6name both as subprocessors

Companies using one are 5.6 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

CompanySlackUserlist
Honeybadgerhoneybadger.ioHoneybadger provides error tracking, logging, and application performance monitoring for web apps in production.Developer tools
SavvyCal Appointmentssavvycal.appSavvyCal Appointments provides a scheduling engine and API that computes availability, enforces scheduling rules, and books appointments atomically.Healthcare
SavvyCalsavvycal.comSavvyCal provides scheduling links that let recipients overlay their own calendar to find a meeting time.Productivity and collaboration
SignWellsignwell.comSignWell provides legally binding electronic signatures for sending, signing, and tracking documents, and offers a REST API for embedding signing workflows into products.
Toggltoggl.comToggl provides time tracking and capacity planning software that combines time data with project planning.Productivity and collaboration
Urlboxurlbox.comUrlbox provides a screenshot API and bulk screenshot tool that renders website URLs or HTML into images, video, PDFs, and structured data.Developer tools

The two technologies

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 1,936 companies we see using Slack also show the other.

All 1,936 companies using Slack1,343 name it as a subprocessorMore in Productivity

Userlist

Email and communications

Userlist is an all-in-one email marketing platform. It is used to automate email marketing and messaging for SaaS companies.

Summarized from userlist.com on 8 Nov 2026.

46% of the 13 companies we see using Userlist also show the other.

All 13 companies using Userlist11 name it as a subprocessorMore in Email and communications

Industries

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

Developer tools2Productivity and collaboration2

Other pairs

Companies with their own evidence for both.

More with Slack

Cloudflare1,813companiesGoogle Workspace1,580companiesAmazon Web Services1,298companiesStripe896companiesGoogle Tag Manager880companiesGoogle810companies

More with Userlist

Cloudflare13companiesAmazon Web Services10companiesGoogle Workspace10companiesStripe10companiesGoogle Tag Manager6companiesHelp Scout6companies

Questions

How many companies use both Slack and Userlist?

6 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 Slack and Userlist?

Honeybadger, SavvyCal Appointments, SavvyCal, SignWell and Toggl, and 1 more company. Each one links to the evidence behind it.

How does StrataDB know a company uses Slack and Userlist?

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 Slack and Userlist

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
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