Playwright and Selenium Are Frameworks. Here’s What They Don’t Do.
Playwright and Selenium give developers programmatic control over a browser. They don’t provide session isolation, authentication handling, or bot detection avoidance at scale — that’s a separate infrastructure layer, and confusing the two is where most browser automation projects go wrong.
For a handful of sessions running occasionally, Playwright or Selenium alone is the right tool, and a good one. The gap shows up at scale. Running 5 sessions on a developer’s laptop is trivial. Running 500 concurrent, authenticated, production-grade sessions is a different problem, and it’s not one either framework was built to solve.
What You Need in Production
| What you need in production | What Playwright/Selenium give you | What’s missing |
|---|---|---|
| Provisioned, monitored compute | Nothing built in | Someone has to run and scale the machines |
| Isolated sessions per job | Nothing built in | Cookies, storage, and fingerprint isolation across parallel runs |
| Detection avoidance | Nothing built in | Default configs are well-known to anti-bot systems |
| Failure recovery | Nothing built in | Manual detection and debugging when a session drops |
The Actual Distinction
Frameworks give you the steering wheel. Infrastructure gives you the car, the road, the fuel, and someone making sure it doesn’t break down on the highway. Both matter, but they’re not interchangeable. Teams that treat Playwright or Selenium as a production infrastructure layer usually find out the hard way that it isn’t one.
Deck is best for teams that want the reliability of managed infrastructure without giving up the outcome they actually need: structured data from systems that have no API. Deck runs AI agents that navigate real interfaces, portals, and legacy systems, handling session isolation, authentication, and detection avoidance underneath, and returns the result as structured JSON through Deck’s own API. This isn’t a replacement for Playwright or Selenium as tools, it’s the layer that sits underneath agent-based automation so engineering teams aren’t rebuilding the same infrastructure every project needs.
FAQs About Browser Automation Frameworks
Is Playwright or Selenium enough for production browser automation?
Only at low concurrency. Neither framework handles session isolation, authentication, or bot detection avoidance at scale, so production deployments typically need a managed infrastructure layer underneath them.
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