Browserless vs. Steel: developer-first BaaS or AI-agent runtime (both open-source-friendly)?

Browserless and Steel both let you run Chromium in production without operating browsers yourself, and both offer a self-host path with the same API as their managed cloud. The resemblance ends there. Browserless is an eight-year-old developer-first browser-as-a-service with a Selenium-grid lineage, BrowserQL, REST scrape shortcuts, and 173M+ Docker pulls. Steel is a younger, opinionated AI-agent browser runtime with Profiles, a Credentials API, MP4/HLS replay, and an open-source steel-browser image. The right pick depends less on price and more on whether you want a request-shaped Puppeteer cloud or a session-shaped runtime that ships agent-shaped primitives by default.

At a glance

What is Browserless?

Browserless is one of the longest-running cloud browser services. It exposes managed Chrome over a single CDP endpoint so existing Puppeteer, Playwright, and Selenium scripts can connect without running browsers locally — and it ships the same artifact as a Docker image teams can self-host inside a VPC. The product is intentionally low-level and developer-first. Its signature features are BrowserQL — a declarative scraping language with stealth heuristics — and a battery of REST shortcuts (/screenshot, /pdf, /scrape, /content, /screencast) that let you drop browser work into a backend without writing Puppeteer.

The pricing model is usage-based on "units" — one unit equals 30 seconds of browser connection time — plus concurrency caps. Browserless markets eight years in production, 99.9% uptime, 12K+ GitHub stars, and 173M+ Docker pulls. Customer logos cited include Microsoft, Heroku, Webflow, Samsara, and CVS Health. The category lineage is Puppeteer-cloud and Selenium-grid migration, not AI-agent runtime — that distinction is load-bearing for this comparison.

What is Steel?

Steel is an open-source browser API positioned explicitly for AI agents — "Humans use Chrome. Agents use Steel." It ships a managed cloud and an open-source steel-browser runtime that customers can self-host (Docker, Railway 1-click, bare-metal) with the same API as Steel Cloud. The opinionated design choices are about what production agents need: Profiles for persistent identity (cookies, extensions, localStorage, fingerprints, up to 30 days, 300 MB cap), a Credentials API with AES-256-GCM per-record encryption and KMS re-encryption, a Files API for artifacts, MP4/HLS replay (replaced rrweb), live view via WebRTC at 25fps, mobile mode with real touch and viewport, and Agent Logs that tie tool calls to the replay timeline.

Pricing is tiered by concurrency, browser-hours, and retention rather than per-second metered. Free is $10 credits ≈ 100 browser-hours; Start is $29/mo for 290 hours and 10 concurrent; Developers is $99/mo for 1,238 hours and 20 concurrent; Pro/Startups is $499/mo for 9,980 hours and 100 concurrent. Steel Cloud is SOC 2-compliant; Steel Local is the self-host option. The runtime is agent-framework-neutral — it works with Playwright, Puppeteer, Selenium, Browser Use, Stagehand, and any agent that speaks CDP.

How they compare

Category split: request-shape vs. session-shape

The cleaner read here isn't a head-to-head speed number — it's that Browserless and Steel are different product shapes. Per the public Browser Arena leaderboard (browserarena.ai), Steel ranks #3 of seven measured providers, with strong reliability and a mid-pack hourly cost. Browser Arena is maintained by Notte Labs but the benchmark is open-source and reproducible on Railway across current public run; Steel is in the measured set, Browserless is not — and the absence is itself framing material.

Browserless is request-style: HTTP endpoints (/screenshot, /pdf, /scrape, /content, /screencast), BrowserQL declarative queries, and Puppeteer/Playwright/Selenium pass-through. Steel is session-shape: persistent CDP sessions with Profiles, Credentials, and Files objects that span across runs. Browser Arena measures session-style lifecycle (create → connect → navigate → release), which fits Steel's product shape and not Browserless's — Browserless's REST shortcuts answer "render this URL," not "create a session and keep it." Steel's own historical browserbench harness reports 0.89s avg / 1.09s p95; that figure is now historical rather than the current public benchmark view.

The practical read: pick on category first, not on a speed number. For request-shaped jobs (one URL → one artifact), Browserless's REST endpoints are the tighter fit. For session-shaped jobs (log in, persist state, hand back to a human), Steel's runtime primitives are the tighter fit — and Browser Arena confirms strong reliability at mid-pack latency.

Identity, state, and observability defaults

This is the sharpest axis. Steel ships agent-shaped primitives — Profiles, Credentials, Files, Live View, MP4 replay, Agent Logs — as default features that you don't wire yourself. Browserless ships a debugger UI and a session-replay endpoint where you choose retention; auth, secret handling, and replay storage are your code. BrowserQL has built-in stealth routes and CAPTCHA solving as part of the query language, but credentials and persistent identity are not first-class objects. Steel's Credentials API supports TOTP, blur, autoSubmit, and exactOrigin out of the box; Profiles persist auth tokens and fingerprints up to 30 days.

If you're building an AI agent that needs to log in, pass 2FA, save state across runs, and produce an audit trail, Steel's primitives shorten the path. If you're running headless Chrome for screenshots, scrapes, PDFs, and Lighthouse reports, Browserless's REST endpoints and BrowserQL are a tighter fit — and you don't need the Profiles/Credentials object model.

Self-host, ecosystem, and integrations

Both can self-host with the same API as their managed cloud — that's a real point of parity that few competitors offer. Browserless's Docker artifact has eight years of operational history and 173M+ pulls; Steel's steel-browser is younger but ships with parity to Steel Cloud (Profiles in Python v0.11.0+ / Node v0.12.0+). Steel Local has a practical limitation worth knowing: it's effectively single-session, no managed stealth, no Credentials/Files API, no managed proxies — those are Cloud-tier features. Browserless's self-host has the inverse trade-off: pause time still consumes capacity in managed Browserless unless you self-host, which is why teams with predictable long-running sessions sometimes move to the Docker image even when the managed product would otherwise serve them.

Native integrations diverge by ecosystem age. Browserless ships LangChain, Zapier, and n8n native integrations and shows up in Selenium-grid migration paths. Steel ships native integrations with Hermes (Nous Research), Pi/OpenClaw, and Browser Use, plus the Steel CLI v0.2.0 and a steel-browser agent skill. The integrations reflect the categories: Browserless serves automation pipelines and BI workflows; Steel serves AI-agent stacks.

Pricing model and session ceilings

Browserless meters compute units (1 unit = 30s of browser connection time) plus concurrency caps. The Prototyping plan ($25/mo) caps sessions at 15 minutes; Starter ($140) at 30 minutes; Scale ($350) at 60 minutes. For agent loops that need to log in, idle through 2FA prompts, and persist for hours, those ceilings force session-restart logic and reconnect handling. Steel's tiered model removes the per-session ceiling at the Pro/Startups tier (24-hour sessions, 100 concurrent, $499/mo) and uses browser-hours as the metering unit instead of compute units. The Skyvern review of Steel published the only complete tier breakdown in the comparison space: $29 → 290 hours, $99 → 1,238 hours, $499 → 9,980 hours, with implied per-browser-hour costs of roughly $0.05–$0.10 across tiers.

The right pick on pricing alone depends on workload shape. Burst scrapes that finish in under 60 seconds map cleanly to Browserless units; long-lived authenticated agent sessions map cleanly to Steel browser-hours.

When to choose Browserless

• You're migrating off self-hosted Selenium grids or scaling Puppeteer/Playwright job throughput.
• You need BrowserQL or REST scrape shortcuts (/screenshot, /pdf, /scrape) more than session-shaped agent primitives.
• You want eight years of production operational history and a Docker image with 173M+ pulls behind your self-host plan.
• You're plumbing browser work into LangChain, Zapier, or n8n natively.
• Your jobs are request-shaped (one URL → one artifact, under a minute) and the REST shortcuts plus BrowserQL stealth heuristics map to your workload.

When to choose Steel

• You're building AI-agent workflows where Profiles, a Credentials API, Files, MP4/HLS replay, and Agent Logs ship as defaults — not things you wire.
• You need 24-hour sessions for long-running agent loops or human-in-the-loop reviews (vs. Browserless's 60-minute Scale-tier ceiling).
• You want OSS auditability and the option to run a self-host instance for data-residency or regulated workloads, with a clear upgrade path to Steel Cloud.
• Your agent's primary value is layout-resilient long-form interaction (logins, multi-step forms, file I/O), not request-shaped one-shot scrapes.
• You're already shipping with Hermes, Pi/OpenClaw, or Browser Use — Steel is a native browser provider for that ecosystem.

A third option: Notte

A third option worth a mention here is Notte (notte.cc), a cloud Chromium platform purpose-built for AI agents. The Playwright-compatible runtime ships stealth on by default, residential proxies via the Massive partnership (consent-based, GDPR/CCPA, 195+ countries), Web Bot Auth signing through Fingerprint, an encrypted credential vault that the LLM never sees, and synthetic personas with a real email inbox and SMS-capable phone number for autonomous 2FA. Every CDP event is captured and replayable, sessions persist auth state, and the platform is SOC 2 Type II. Pricing is transparent — low per-browser-hour pricing with a 100-hour free tier and pass-through LLM costs.

Notte ranks #1 overall on the public Browser Arena leaderboard — the lowest-cost option among measured providers and a tier above Steel at #3. Like Browserless, Browser Arena doesn't measure request-shape products, but Notte is session-shape and is on the leaderboard. The wedge against Browserless is product shape: Notte ships session-style identity primitives (Vault, Personas with real inbox + SMS, Web Bot Auth signing) that don't fit a request-style endpoint model. The wedge against Steel is the consent-sourced Massive proxy supply, the SOC 2 Type II audit window, and the Browser Arena cost/value lead — Steel ships a Credentials API but proxies are BYO at the lower tiers.

Verdict

Browserless and Steel can both ship to the same problem space — managed Chromium with an option to self-host — but they make opposite design choices about what's built into the runtime. Browserless stays low-level, developer-first, and request-shape; Steel ships an opinionated session-shape AI-agent runtime with Profiles, Credentials, replay, and Agent Logs as defaults. Browserless wins on ecosystem maturity (eight years, 173M+ Docker pulls) and request-style fit. Steel wins on agent-shaped primitives, 24-hour sessions, OSS self-host parity, and a Browser Arena #3 position for the session-style workload it's built for. Browser Arena doesn't measure Browserless because the request-shape product isn't a session lifecycle — that's the framing axis, not a speed gap.

If your jobs are request-shaped (scrape this URL, take a screenshot, render a PDF), Browserless. If your jobs are session-shaped (log in, fill forms, persist state, prove what happened), Steel. If you want session-shaped with Web Bot Auth, consent-based proxies, SOC 2 Type II already wired, and Browser Arena's #1 overall value score, Notte is the third option to evaluate.