Browserbase vs Kernel for browser agents.

Both vendors create managed Chromium sessions. Both expose standard browser connections. Their execution choices differ above that layer.

Browserbase supports external library connections. It also offers platform agents and functions. Kernel adds co-located Playwright execution.

Kernel also exposes OS-level controls. Browserbase documents browser-oriented MCP tools. Each path changes latency and ownership.

Start with current application boundaries. Keep orchestration placement explicit. Avoid choosing from benchmark headlines alone.

A browser endpoint is one choice. Code placement is another choice. Agent reasoning placement adds a third.

Browserbase returns connection details for libraries. Its MCP server provides browser-oriented tools. Hosted Functions add vendor-side execution.

Kernel supports direct CDP and WebDriver. Computer controls operate through screen primitives. Playwright execution runs inside the browser VM.

These modes are not interchangeable. Each exposes different debugging evidence. Each creates different portability costs.

Session names hide different state machines. Browserbase separates connection, keep-alive, context, and closure. Kernel adds active and standby behavior.

Kernel standby preserves browser state temporarily. Billing stops during documented standby. Its timeout begins after standby starts.

Browserbase keep-alive supports reconnection after disconnection. The session still follows configured duration limits. Contexts address later-session browser data.

Write each transition into application logs. Include vendor identifiers and timestamps. Treat missing transitions as failed evidence.

Both vendors support reusable browser state. Browserbase calls its primitive a context. Kernel calls its primitive a profile.

Browserbase contexts preserve several Chromium data stores. Persistence must be requested on sessions. Synchronization follows session closure.

Kernel profiles need save_changes for writes. Deletion or timeout then saves state. A normal Playwright close does not save.

Those details change application design. Assign one writer per identity. Add locks around mutable profile use.

Vendor benchmarks cannot settle your workload. Runner geography influences every network measurement. Browser mode changes resource requirements.

Use one pinned task and browser configuration. Run both vendors from one runner. Alternate vendors to reduce time drift.

Record raw timestamps, not summary claims. Keep failures inside the sample. Publish exclusions before running anything.

The idle phase matters separately. Kernel documents standby billing behavior. Browserbase documents browser-time allocations and minimums.

Browserbase provides a session inspector. Its documented surface includes logs, network data, metrics, and replay. Live View supports human control.

Kernel provides Live View and optional replays. It also documents structured telemetry. App deployments can provide invocation logs.

More artifacts do not guarantee faster diagnosis. Identifier linkage matters more. Retention and export needs also matter.

Create two deliberate failures. Break one selector and one connection. Measure the path to root cause.

Kernel publishes browser pools for repeated workloads. Pools reserve ready browsers with predefined configuration. Reserved capacity counts against concurrency.

Browserbase publishes concurrency and creation limits by plan. Keep-alive can reduce repeated session creation. Those mechanisms solve related pressure differently.

A faster individual start may not improve queues. A pool may reduce configuration startup work. It also consumes reserved capacity.

Measure queue delay separately. Measure browser readiness separately. Price active runtime and capacity constraints separately.

Direct CDP migration offers the narrowest trial. Keep current Playwright logic unchanged. Replace only creation and connection code.

Do not add co-located execution immediately. That would combine vendor and architecture changes. Baseline behavior would become ambiguous.

Next migrate persistent state. Use one profile writer. Confirm explicit deletion triggers the expected save.

Finally consider Kernel-specific control paths. Compare those paths against measured needs. Preserve a rollback adapter until acceptance.

Legba offers an agent skill. It provides browser routing and isolated sessions. Your agent stack retains permissions and logs.

These cited sources establish no platform equivalence. They document a narrower agent-skill scope.

That boundary matters during procurement. Some teams need infrastructure control planes. Others need a callable isolated route.

Choose from the actual job. Avoid buying unused platform breadth. Validate the required agent path.