OpenAI API vs Tavily: who uses which
Customers, public proof and the companies that use both.
On usedby, 45 companies use OpenAI API and 19 use Tavily. 2 companies use both, including JetBrains and Rox. OpenAI API leads among the Artificial Intelligence companies on usedby that use either tool.Latest check Nov 12, 2026: 63 of 64 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 OpenAI API, Tavily, or both
Every company with a public proof for at least one of the two tools.
43
listed for OpenAI API only
2
companies use both
17
listed for Tavily only
On usedby, 43 companies are listed for OpenAI API only, 17 are listed for Tavily only and 2 use both, out of the 62 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, OpenAI API |
|---|---|
 JetBrains | On or before Dec 2025 |
 Rox | On or before Oct 2026 |
By industry
Which tool the companies on usedby use, by industry. Shares of the companies on usedby that use OpenAI API, Tavily or both: a share of the companies on usedby, not of the market.
Listed for OpenAI API onlyBothListed for Tavily only
More common with OpenAI API
- Artificial Intelligence10 of the 12 Artificial Intelligence companies on usedby that use either tool use OpenAI API.
- DevTools & Infrastructure5 of the 6 DevTools & Infrastructure companies on usedby that use either tool use OpenAI API, 1 of them alongside Tavily.
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: OpenAI API, 2 of 4; Tavily, 0 of 4. Missing facts remain unverified, not absent features.
OpenAI API
TavilyWhat customers report
Results as the vendor or the customer published them, with the source and the date.
OpenAI API
No reviewed story for OpenAI API yet.
Tavily
the number of customers using Ocean's agents grew 1.5x
Ocean
Vendor case study, tavily.com, captured Nov 12, 2026
An estimated 20 hours of scraper work saved each month
Astelia
Vendor case study, tavily.com, captured Nov 12, 2026
Questions about OpenAI API and Tavily
Which is used more, OpenAI API or Tavily?
OpenAI API has more customers on usedby: 45 against 19 for Tavily.
Do companies use both OpenAI API and Tavily?
Yes. 2 companies use both on usedby, including JetBrains and Rox.
Who uses OpenAI API?
45 companies on usedby, each with the public page that shows it. See who uses OpenAI API.
Who uses Tavily?
19 companies on usedby, each with the public page that shows it. See who uses Tavily.
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.