CoreWeave vs Fireworks AI: who uses which
Customers, public proof and the companies that use both.
On usedby, 18 companies use CoreWeave and 29 use Fireworks AI. No company is listed with both yet. CoreWeave leads among the Artificial Intelligence companies on usedby that use either tool, Fireworks AI among the DevTools & Infrastructure companies.Latest check Oct 7, 2026: 47 of 47 public lines checked. Counts include every proof level, job-post signals included. Companies named on both have a confirmed or observed line on each side.
Who uses CoreWeave, Fireworks AI, or both
Every company with a public proof for at least one of the two tools.
18
use only CoreWeave
0
companies use both
29
use only Fireworks AI
18 companies use only CoreWeave, 29 use only Fireworks AI and 0 use both, out of the 47 companies on usedby that use at least one of them.
Where it lands
Newest customers
No new customer since tracking started on October 7, 2026.
Where it lands
Newest customers
No new customer since tracking started on October 5, 2026.
Who uses both
Companies with a confirmed or observed line on both tools.
By industry
Which tool the companies on usedby use, by industry. Shares of the companies on usedby that use CoreWeave, Fireworks AI or both: a share of the companies on usedby, not of the market.
CoreWeave onlyBothFireworks AI only
More common with CoreWeave
- Artificial Intelligence4 of the 7 Artificial Intelligence companies on usedby that use either tool use CoreWeave.
More common with Fireworks AI
- DevTools & Infrastructure6 of the 6 DevTools & Infrastructure companies on usedby that use either tool use Fireworks AI.
Source: confirmed and observed usedby lines. Job-post signals, the weakest proof level, are left out of these shares.
Side by side
Facts from our data and from each vendor's public pages. Each line says where it comes from.
CoreWeaveFireworks AIWhat customers report
Results as the vendor or the customer published them, with the source and the date.
CoreWeave
The team went from POC to production in three weeks.
Mercado Libre
Vendor case study, wf.coreweave.com, published Jul 2, 2026
saving 75% in cloud costs
NovelAI
Vendor case study, wf.coreweave.com, published Oct 6, 2026
Fireworks AI
No reviewed story for Fireworks AI yet.
Questions about CoreWeave and Fireworks AI
Which is used more, CoreWeave or Fireworks AI?
Fireworks AI has more customers on usedby: 29 against 18 for CoreWeave. CoreWeave leads among the Artificial Intelligence companies on usedby that use either tool, Fireworks AI among the DevTools & Infrastructure companies.
Do companies use both CoreWeave and Fireworks AI?
usedby has not found a company with a confirmed or observed line on both CoreWeave and Fireworks AI yet.
Who uses CoreWeave?
18 companies on usedby, each with the public page that shows it. See who uses CoreWeave.
Who uses Fireworks AI?
29 companies on usedby, each with the public page that shows it. See who uses Fireworks AI.
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 three proof levels: confirmed, observed or signal (a job post, the weakest). A company is named as using both tools when its lines on both are confirmed or observed.