On usedby, 25 companies use E2B and 17 use Kernel. 1 company uses both, including Anything. E2B leads among the Artificial Intelligence companies on usedby that use either tool.Latest check Oct 25, 2026: 42 of 42 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 E2B, Kernel, or both
Every company with a public proof for at least one of the two tools.
24
listed for E2B only
1
company uses both
16
listed for Kernel only
On usedby, 24 companies are listed for E2B only, 16 are listed for Kernel only and 1 uses both, out of the 41 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, E2B |
|---|---|
 Anything | On or before Oct 2026 |
By industry
Which tool the companies on usedby use, by industry. Shares of the companies on usedby that use E2B, Kernel or both: a share of the companies on usedby, not of the market.
Listed for E2B onlyBothListed for Kernel only
More common with E2B
- Artificial Intelligence16 of the 17 Artificial Intelligence companies on usedby that use either tool use E2B, 1 of them alongside Kernel.
- DevTools & Infrastructure3 of the 5 DevTools & Infrastructure companies on usedby that use either tool use E2B.
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.
E2B
KernelWhat customers report
Results as the vendor or the customer published them, with the source and the date.
E2B
More than 60% lower customer latency for heavy Replicas workloads after moving to E2B.
Replicas
Vendor case study, e2b.dev, published Aug 27, 2026
Approximately 600,000 sandboxes per day.
Arena (LMArena)
Vendor case study, e2b.dev, published Oct 1, 2026
Kernel
cutting browser cold starts by 333x
Stably
Vendor case study, kernel.sh, published May 26, 2026
Questions about E2B and Kernel
Which is used more, E2B or Kernel?
E2B has more customers on usedby: 25 against 17 for Kernel.
Do companies use both E2B and Kernel?
Yes. 1 company uses both on usedby, including Anything.
Who uses E2B?
25 companies on usedby, each with the public page that shows it. See who uses E2B.
Who uses Kernel?
17 companies on usedby, each with the public page that shows it. See who uses Kernel.
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.