ClickUp vs Slack: who uses which
Customers, public proof and the companies that use both.
On usedby, 28 companies use ClickUp and 40 use Slack. 2 companies use both, including Spotify and Wayfair. Slack leads among the Artificial Intelligence companies on usedby that use either tool.Latest check Nov 13, 2026: 68 of 68 public lines checked. Counts include every proof level, job-post signals included. A company on both tools counts at any proof level, and a job post on one side is marked as such.
Who uses ClickUp, Slack, or both
Every company with a public proof for at least one of the two tools.
26
listed for ClickUp only
2
companies use both
38
listed for Slack only
On usedby, 26 companies are listed for ClickUp only, 38 are listed for Slack only and 2 use both, out of the 66 companies listed for at least one. An absent listing does not prove non-use.
Where it lands
Recently publicly listed customers
Who uses both
Companies with a public line on both tools, at any proof level: the strongest proofs come first, and a job post is marked.
| Company | First public proof, ClickUp |
|---|---|
 Spotify | On or before Dec 2024 |
 Wayfair | On or before Aug 2025 |
Side by side
Facts from our data and from each vendor's public pages. Each line says where it comes from.
Vendor facts checked: ClickUp, 4 of 6; Slack, 4 of 6. Missing facts remain unverified, not absent features.
ClickUp
SlackWhat customers report
Results as the vendor or the customer published them, with the source and the date.
ClickUp
saved $120,000 on total game development costs
Yggdrasil
Vendor case study, clickup.com, captured Nov 6, 2026
they’ve saved 100+ hours across teams
Lids
Vendor case study, clickup.com, captured Nov 6, 2026
Slack
that would take someone more than an hour
Mural
Vendor case study, slack.com, captured Nov 12, 2026
saves me four to five hours each week
Isometric
Vendor case study, slack.com, captured Nov 12, 2026
Questions about ClickUp and Slack
Which is used more, ClickUp or Slack?
Slack has more customers on usedby: 40 against 28 for ClickUp.
Do companies use both ClickUp and Slack?
Yes. 2 companies use both on usedby, including Spotify and Wayfair.
Who uses ClickUp?
28 companies on usedby, each with the public page that shows it. See who uses ClickUp.
Who uses Slack?
40 companies on usedby, each with the public page that shows it. See who uses Slack.
How does usedby count customers?
A company counts when a public page shows it: a vendor's customer page, a case study, a press release or a job post, most saved with a dated capture. Every line is a customer, at one of four proof levels: confirmed, declared by the company itself, observed or signal (a job post, the weakest). A company counts as using both tools when it has a line on each, at any level; the list shows the strongest proofs first and marks job posts.