Datadog vs Harness: who uses which
Customers, public proof and the companies that use both.
On usedby, 60 companies use Datadog and 45 use Harness. 1 company uses both, including Twilio. Datadog leads among the Artificial Intelligence companies on usedby that use either tool, Harness among the Fintech & Payments companies.Latest check Nov 13, 2026: 105 of 105 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 Datadog, Harness, or both
Every company with a public proof for at least one of the two tools.
59
listed for Datadog only
1
company uses both
44
listed for Harness only
On usedby, 59 companies are listed for Datadog only, 44 are listed for Harness only and 1 uses both, out of the 104 companies listed for at least one. An absent listing does not prove non-use.
Where it lands
Recently publicly listed customers
No new public customer listing since tracking started on October 9, 2026.
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, Harness |
|---|---|
 Twilio | On or before Aug 2026 |
By industry
Which tool the companies on usedby use, by industry. Shares of the companies on usedby that use Datadog, Harness or both: a share of the companies on usedby, not of the market.
Listed for Datadog onlyBothListed for Harness only
More common with Datadog
- Artificial Intelligence11 of the 13 Artificial Intelligence companies on usedby that use either tool use Datadog.
- DevTools & Infrastructure3 of the 5 DevTools & Infrastructure companies on usedby that use either tool use Datadog.
More common with Harness
- Fintech & Payments5 of the 7 Fintech & Payments companies on usedby that use either tool use Harness.
- Banking & Mortgages5 of the 6 Banking & Mortgages companies on usedby that use either tool use Harness.
- Retail3 of the 5 Retail companies on usedby that use either tool use Harness.
Source: every usedby line, from confirmed proofs to job-post signals (the weakest proof level).
Side by side
Facts from our data and from each vendor's public pages. Each line says where it comes from.
Vendor facts checked: Datadog, 4 of 6; Harness, 4 of 6. Missing facts remain unverified, not absent features.
DatadogHarnessWhat customers report
Results as the vendor or the customer published them, with the source and the date.
Datadog
reduce global mean time to resolution (MTTR) from 11 hours to less than one hour, an improvement of approximately 90%
Bullla
Vendor case study, datadoghq.com, published Oct 21, 2026
those metrics are available to all 2,300 SNCF engineers and administrators, across all teams and environments
SNCF
Vendor case study, datadoghq.com, published Sep 8, 2021
Harness
We went from a release cadence of every two weeks to multiple times a day.
Speedway Motors
Vendor case study, harness.io, published Aug 5, 2026
getting up and running six months ahead of plan
Twilio
Vendor case study, harness.io, published Aug 5, 2026
Questions about Datadog and Harness
Which is used more, Datadog or Harness?
Datadog has more customers on usedby: 60 against 45 for Harness. Datadog leads among the Artificial Intelligence companies on usedby that use either tool, Harness among the Fintech & Payments companies.
Do companies use both Datadog and Harness?
Yes. 1 company uses both on usedby, including Twilio.
Who uses Datadog?
60 companies on usedby, each with the public page that shows it. See who uses Datadog.
Who uses Harness?
45 companies on usedby, each with the public page that shows it. See who uses Harness.
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.