Kernel Browser Infrastructure for AI Agents Explained
Kernel is a browser-as-a-service company for developers building AI agents. It runs cloud browsers that agents can use to work on real websites, and it handles the hard parts around them, like logins, CAPTCHAs, proxies and session recordings.
The quick answer: Kernel is a strong option for teams whose agents have to use websites that have no API. It has a free plan, paid plans at $30 and $200 a month plus usage, and speed claims worth testing against your own workload. It’s a developer tool, so it isn’t something a non-technical buyer would use directly.
Kernel at a glance
Checked against Kernel’s site and pricing page on November 2, 2026.
| Kernel | |
|---|---|
| What it is | Cloud browser infrastructure for AI agents and automations |
| Founders | Catherine Jue (CEO) and Rafael Garcia (CTO) |
| Funding | About $22 million across seed and Series A, led by Accel |
| Plans | Free, Hobbyist at $30/month, Start-up at $200/month, Enterprise |
| Usage | $0.0000166667 per GB-second, with no charge for idle time or proxies |
| Security | SOC 2 and HIPAA, with a BAA on Enterprise |
| Best for | Engineers building agents that must work on real websites |
What Kernel does
Many valuable tasks live behind websites with no usable API: filing forms on an insurer’s portal, checking out on a store, or testing a merchant site. An agent needs a real browser to do that work, and running thousands of browsers reliably is hard.
Kernel’s main features:
- Sandboxed Chromium: cloud browsers that it says spin up in under 30 milliseconds.
- Stealth mode: CAPTCHA solving and managed proxies.
- Managed auth: handles logins for your agents.
- Agentic payments: checkout through wallet integrations like Link by Stripe.
- GPU acceleration: for memory-heavy and canvas-based sites.
- Live view and replays: watch sessions and record them for debugging.
Kernel says more than 11,000 teams use it. Named customers include The Prompting Company, Effective, Rye, Stably and Felicity. It also describes partnerships with Anthropic on Claude Managed Agents, and with Stripe, 1Password and Vercel.
Kernel pricing
| Plan | Price | Credits | Concurrent browsers | Replays kept |
|---|---|---|---|---|
| Free | $0/month | $5/month | 5 | 1 day |
| Hobbyist | $30/month | $10/month | 10 | 7 days |
| Start-up | $200/month | $50/month | 150 | 30 days |
| Enterprise | Custom | Custom | High volume | Custom |
Each plan adds usage costs, charged per GB-second. At the listed rate, a browser using 1 GB for one hour costs about 6 cents. Headless and headful browsers are priced differently, and real memory use varies by site, so measure a typical task before you estimate.
Kernel doesn’t charge for proxies or idle time, which is a useful difference for agents that pause to think. Custom proxies, GPU acceleration and regional browsers start at the Start-up plan.
The speed claims
Kernel’s site cites benchmarks from ComputeSDK showing 6.43 actions per second, against 4.00 for Browserbase and 3.61 for Browser Use. Its cold-start comparison shows 794 milliseconds, against 2,967 for Browserbase and 8,001 for Anchor Browser.
These are useful signals, but they appear on Kernel’s own marketing page, and they are snapshots of specific test conditions. Note too that the 30-millisecond spin-up and the 794-millisecond cold start measure different things. For most agents, the model’s thinking time will outweigh browser speed anyway, so run your own task on each option.
What to think about with stealth browsing
Stealth features are what make many agents work, and they’re also the area that needs the most care. Tools that solve CAPTCHAs and rotate proxies help agents get past defenses that sites set up on purpose.
That can conflict with a website’s terms of service, even if your purpose is harmless. Before you automate a site, check its terms and whether an official API exists. Kernel’s work with Vercel on Web Bot Auth points to another path, in which agents identify themselves instead of hiding. Letting agents hold logins and payment methods also raises the stakes for a mistake, so limit what each agent can do.
The team and funding
Accel led Kernel’s Series A, and Axios reported about $22 million in combined seed and Series A funding in October 2025. Catherine Jue previously led an engineering team at Cash App, where she ran into this problem while using agents to test merchant sites. Rafael Garcia co-founded Clever, the education identity company.
How Kernel compares
Browserbase is the best-known competitor and the default on many shortlists. Browser Use is popular as an open-source agent framework, with a hosted service. Anchor Browser, Hyperbrowser and Steel also compete here, and TinyFish also targets web agents.
If the app you need has an API, use that instead of a browser. It’s faster, cheaper and far less likely to break when a page changes. A browser agent makes sense when no such route exists.
FAQ
What is Kernel?
Kernel is a cloud browser platform for AI agents. It gives developers fast browsers with stealth, login handling, replays and payment tools.
What is a Kernel browser?
A Kernel browser is a sandboxed Chromium browser running in the cloud, which an AI agent controls to work on websites.
How much does Kernel cost?
It has a free plan with $5 in monthly credits, Hobbyist at $30 a month and Start-up at $200 a month, each plus usage. Enterprise is custom.
Is Kernel open source?
Kernel describes its browser infrastructure as open source and is built in public on GitHub. Its hosted platform is a paid commercial service.
Is Kernel HIPAA compliant?
Kernel lists SOC 2 and HIPAA compliance, and says a BAA is available on its Enterprise plan.
Do I need Kernel for my AI agent?
Only if your agent must use websites with no API. If the apps you use have APIs, a browser usually adds cost and fragility.
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