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How Lark uses E2B

As published on e2b.dev, September 2026. Checked by usedby on Oct 10, 2026.

What happened

Lark, an AI test engineer product, runs each end-to-end test its agents generate in an isolated E2B sandbox created from a custom template. The sandboxes run browsers, APIs and scripts against customers' applications, including Docker containers, and are destroyed after each test.

Summary written by usedby from the source page, in English. The figures are those of E2B and Lark, not ours.

Running Docker containers inside sandboxes limits the field to a handful of providers, and E2B's MicroVM isolation meant Lark didn't have to build and operate that isolation layer on its own, saving them at least several weeks of building out their own sandbox infrastructure.

From the page. e2b.dev

E2B has been a tried and true option. I would recommend them, especially against building anything yourself.

Jack Brown, CEO, Lark. Source

What the story claims, and what we checked

What we compared with the page.

  • The passage quoted aboveCheckedCopied word for word from the page, near the name of Lark.
  • The publication dateCheckedRead from the page’s own metadata, never guessed.
  • Lark uses E2BCheckedConfirmed line.
  • The result itselfNot checkedWe quote it; we did not measure it.

Same company, same tool or same industry.

1-2 weeks“Shipped sandboxed code execution in 1-2 weeks, roughly 10x faster than building it in-house”ClickUp uses E2B. Another customer of E2B600,000 sandboxes“Approximately 600,000 sandboxes per day.”Arena (LMArena) uses E2B. Another customer of E2B60%“More than 60% lower customer latency for heavy Replicas workloads after moving to E2B.”Replicas uses E2B. Another customer of E2B