Nanobrowser vs 
Steel
Nanobrowser vs Steel compared for 2026 — features, license, ease of use, performance and which one to choose. Multi-agent web automation in your own browser vs Headless browser infrastructure for AI agents.
Updated regularly · curated by OpenSourceAI.tech
Nanobrowser vs Steel at a glance
| Spec | Nanobrowser | Steel |
|---|---|---|
| Category | Browser & computer-use agents | Browser & computer-use agents |
| Type | Chrome extension agent | Browser API for agents |
| License | Apache-2.0 | Apache-2.0 |
| Runs locally | Partial | Yes |
| Primary language | TypeScript | TypeScript |
| Ease of use | Beginner | Intermediate |
| Best for | an OpenAI-Operator-style agent you fully control | giving production agents reliable web access |
| GitHub stars | 13.5k | 7.3k |
How Nanobrowser and Steel score
| Criterion | Nanobrowser | Steel |
|---|---|---|
| Popularity | 3.0 | 2.5 |
| Maintenance | 3.0 | 5.0 |
| Ease of use | 5.0 | 3.5 |
| Privacy | 3.5 | 5.0 |
| License freedom | 5.0 | 5.0 |
Scores are computed automatically from public signals — GitHub stars (popularity), recent commit activity (maintenance), license type (freedom), local-first design (privacy) and onboarding complexity (ease of use). Indicative, not a verdict.
What each one is
Nanobrowser
Nanobrowser is an open Chrome extension where a planner and a navigator agent cooperate to browse and complete web tasks — running in your existing browser with your own API keys.
- Runs in your real browser — sessions and logins included
- Planner + navigator multi-agent design
- Your keys, your data, zero subscription
Steel
Steel is an open browser-as-API: launch controlled Chrome sessions for your agents with anti-bot handling, session management and a live debug view, self-hosted or cloud.
- Purpose-built browser sessions for agents
- Session reuse, proxies and debugging UI
- Self-hostable with Docker in minutes
Key differences
Nanobrowser is chrome extension agent, while Steel is browser API for agents. Nanobrowser leans more beginner-friendly, whereas Steel is more suited to intermediate users. They also differ in how they run (Partial vs Yes). In short, Nanobrowser fits an OpenAI-Operator-style agent you fully control, and Steel fits giving production agents reliable web access.
Which should you choose?
Choose Nanobrowser for an OpenAI-Operator-style agent you fully control. Choose Steel for giving production agents reliable web access.
There is rarely one winner — many setups use both. The right pick depends on your hardware, your team's skills, and whether you value simplicity or control.
Frequently asked questions
Is Nanobrowser or Steel easier to use?
Nanobrowser is generally the easier of the two to get started with, while Steel rewards more setup with more control.
Are Nanobrowser and Steel free?
Nanobrowser is free and open source (Apache-2.0), and Steel is free and open source (Apache-2.0). Neither charges for the core software.
Can I run Nanobrowser and Steel locally?
Nanobrowser: partial · Steel: yes. Both can be used without sending your data to a third-party cloud where their setup allows.
Nanobrowser vs Steel — which should I pick in 2026?
Choose Nanobrowser for an OpenAI-Operator-style agent you fully control. Choose Steel for giving production agents reliable web access.
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