The use case: how Stably deploys Kernel
Stably runs its AI-driven end-to-end testing platform on Kernel's cloud browsers, replacing headless Chromium it self-hosted on AWS. It uses headful browser sessions for interactive test authoring with an AI agent and for large parallel test suites.
More reported results
Figures published in Kernel’s case study. They are not independently measured by usedby.
browser cold starts that took 10-20 seconds on aws are now 30 ms.
In the customer’s words
we evaluated many options, and kernel is the only one that could deliver the performance all of our customers' test suites required.Other companies using Kernel
Customers across industries, with public evidence.
FelicityConfirmed
FlintConfirmed
RyeConfirmed
The Prompting CompanyConfirmed
Cash AppObserved
Claim HealthObservedGo straight to the source
Based on Kernel’s published case study. We check the public evidence; the results are reported by the vendor.
kernel.sh- Source published
- May 26, 2026
- Last checked
- Oct 25, 2026
Open source capture What the story claims, and what we checked
What we compared with the page.
- The figure: 333xChecked
Printed word for word on the page, near the name of Stably.
- The passage quoted aboveChecked
Copied word for word from the page, near the name of Stably.
- The publication dateChecked
Read from the page’s own metadata, never guessed.
- Stably uses KernelChecked
Confirmed line.
- The result itselfNot checked
We quote it; we did not measure it.
browser cold starts that took 10-20 seconds on aws are now 30 ms. users can easily spin up hundreds of parallel headful browser sessions for test suites without worrying about performance.