Browser Use vs Project Mariner
Browser Use vs Project Mariner: side-by-side comparison of two computer-use & desktop agents systems — architecture, taxonomy, license, pricing, MCP/A2A support, and direct edges.
Cost & capability
| Browser Use | Project Mariner | |
|---|---|---|
| Capability band | competent | competent |
| Capability composite | 68 | 73 |
| Cost tier | free | mid |
| $/Mtok input | 0 | — |
| $/Mtok output | 0 | — |
| Use cases | Scoped Agentic | Scoped Agentic |
Where they differ (14)
Rows where both sides have data and the values disagree — the shortlist of dimensions that actually distinguish these two systems.
| Browser Use | Project Mariner | |
|---|---|---|
| Capability composite | 68 | 73 |
| Cost tier | free | mid |
| Type | OSS browser-agent library + Cloud (browser-use) | Google DeepMind browser-agent (research preview) |
| Created | 2024-10 (GitHub first commit) | 2024-12 |
| Pricing | OSS free; Cloud tiers (usage-based) | Bundled with Gemini Advanced ($19.99/mo) |
| Funding | $17M seed Mar-2025 (Felicis lead) | Google DeepMind parent (Alphabet) |
| Backend storage | Local Playwright state; Cloud uses managed Postgres | Google-managed session state |
| Deployment | Pip self-host + Browser Use Cloud | Chrome extension + Google Cloud |
| API surface | Python SDK + Cloud REST API | Chrome extension; underlying Gemini 2.0 API |
| Multi-tenancy | Cloud is multi-tenant; OSS is single-tenant per process | Single-tenant per Google account |
| MCP | Browser Use MCP server (community + first-party) | searched not found |
| A2A | searched not found | Google's own A2A protocol — likely first-party compatible |
| Optimised for | LLM-driven browser automation as a primitive — DOM + screenshot mode | Gemini 2.0-powered Chrome agent |
| Anti-fit | Not for desktop apps (browser-only); not a SaaS — caller builds product on top | Research preview only; Chrome only; Gemini Advanced tier |
At a glance
| Browser Use | Project Mariner | |
|---|---|---|
| Section | Computer-use & desktop agents | Computer-use & desktop agents |
| Tier | T1 | T1 |
| Type | OSS browser-agent library + Cloud (browser-use) | Google DeepMind browser-agent (research preview) |
| Created | 2024-10 (GitHub first commit) | 2024-12 |
| Latest release | Active weekly releases (PyPI: browser-use) | — |
| License | MIT | — |
| GitHub | github.com/browser-use/browser-use — 60k+ stars | — |
| Pricing | OSS free; Cloud tiers (usage-based) | Bundled with Gemini Advanced ($19.99/mo) |
| Funding | $17M seed Mar-2025 (Felicis lead) | Google DeepMind parent (Alphabet) |
| Backend storage | Local Playwright state; Cloud uses managed Postgres | Google-managed session state |
| Deployment | Pip self-host + Browser Use Cloud | Chrome extension + Google Cloud |
| API surface | Python SDK + Cloud REST API | Chrome extension; underlying Gemini 2.0 API |
| Multi-tenancy | Cloud is multi-tenant; OSS is single-tenant per process | Single-tenant per Google account |
| MCP | Browser Use MCP server (community + first-party) | searched not found |
| A2A | searched not found | Google's own A2A protocol — likely first-party compatible |
| OpenTelemetry | searched not found | searched not found |
| Optimised for | LLM-driven browser automation as a primitive — DOM + screenshot mode | Gemini 2.0-powered Chrome agent |
| Anti-fit | Not for desktop apps (browser-only); not a SaaS — caller builds product on top | Research preview only; Chrome only; Gemini Advanced tier |
Taxonomy
| Axis | Browser Use | Project Mariner |
|---|---|---|
| storage | kv | kv |
| retrieval | injection | injection |
| persistence | session | session |
| update | agent-controlled | agent-controlled |
| unit | turn | turn |
| governance | inspectable | opaque |
| conflict | stateless | stateless |
Pros & cons
Browser Use
Pros: Most-starred browser-agent OSS in 2025; permissive MIT license; Felicis-backed; works on top of any major LLM.
Cons: Not a finished app — caller builds product on top; compliance / SOC 2 still maturing on Cloud.
Project Mariner
Pros: Strong WebVoyager numbers; Google distribution; A2A first-party adjacency.
Cons: Research preview; Chrome / Gemini Advanced tier; closed source.