On usedby, 15 companies use Jira and 50 use Slack. 2 companies use both, including Read AI and Canva. Slack leads among the Artificial Intelligence companies on usedby that use either tool.Latest check Nov 13, 2026: 65 of 65 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 Jira, Slack, or both
Every company with a public proof for at least one of the two tools.
13
listed for Jira only
2
companies use both
48
listed for Slack only
On usedby, 13 companies are listed for Jira only, 48 are listed for Slack only and 2 use both, out of the 63 companies listed for at least one. An absent listing does not prove non-use.
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, Jira | First public proof, Slack |
|---|---|---|
 Read AI | On or before Nov 2026 | On or before Nov 2026 |
 Canva | — | — |
Side by side
Facts from our data and from each vendor's public pages. Each line says where it comes from.
Vendor facts checked: Jira, 0 of 6; Slack, 4 of 6. Missing facts remain unverified, not absent features.
Jira
SlackWhat customers report
Results as the vendor or the customer published them, with the source and the date.
Jira
By adopting Jira Service Management, 24 Hour Fitness saved 37% of their IT service management budget
24 Hour Fitness
Vendor case study, atlassian.com, captured Nov 13, 2026
Loom alone has already saved ServiceRocket 12,000 meetings and 6,000 hours of work a year
ServiceRocket
Vendor case study, atlassian.com, captured Nov 13, 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 Jira and Slack
Which is used more, Jira or Slack?
Slack has more customers on usedby: 50 against 15 for Jira.
Do companies use both Jira and Slack?
Yes. 2 companies use both on usedby, including Read AI and Canva.
Who uses Jira?
15 companies on usedby, each with the public page that shows it. See who uses Jira.
Who uses Slack?
50 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.