Headless browser limits: when you hit one
20 provider limits with the provider's own sentence and check date. The link in each section gives the verdicts at twice a typical monthly workload.
Airtop: Too many requests at once
Calls above the concurrency cap wait or are refused.
- Free: 3 at once
- Starter: 3 at once
- Professional: 30 at once
- Enterprise: 100 at once
3 simultaneous sessions 1 deployed agent
Source: airtop.ai/pricing
3 simultaneous sessions 10 deployed agents Integrated Proxy
Source: airtop.ai/pricing
30 deployed agents 30 simultaneous sessions Custom Proxy
Source: airtop.ai/pricing
Checked 2026-11-11
Plans that clear it: Kernel Start-up (150 at once); Anchor Browser Growth (200 at once).
Anchor Browser: Too many requests at once
Calls above the concurrency cap wait or are refused.
Up to 5 concurrent browsers
Source: anchorbrowser.io/pricing
Up to 25 concurrent browsers
Source: anchorbrowser.io/pricing
Up to 50 concurrent browsers
Source: anchorbrowser.io/pricing
Checked 2026-11-11
Bright Data: Credits run out
No extra usage: when the included credits are used up, calls stop until the next period or a new plan.
- Free Tier: no extra usage
A free tier account has a hard stop when credits are exhausted, never a surprise bill.
Source: docs.brightdata.com/general/account/billing-and-pricing/free-tier.md
Checked 2026-11-11
Plans that clear it: Anchor Browser Starter (extra usage allowed); Anchor Browser Team (extra usage allowed); Anchor Browser Growth (extra usage allowed).
Bright Data: Too many requests at once
Calls above the concurrency cap wait or are refused.
- Free Tier: a cap
- Pay as you go: a cap
- Scale: a cap
Simulates Human-Like Browsing Behavior Unlimited Concurrent Requests Ethical Compliance
Source: brightdata.com/pricing/scraping-browser
Pay as you go $ 8 /GB Start free No monthly commitment Built-in proxies and unlocking Puppeteer, Playwright & Selenium supported Unlimited concurrent sessions
Source: brightdata.com/pricing/scraping-browser
71 GB included Built-in proxies and unlocking Puppeteer, Playwright & Selenium supported Unlimited concurrent browsers
Source: brightdata.com/pricing/scraping-browser
Checked 2026-11-11
Plans that clear it: Hyperbrowser Free (1 at once); Browserless Free (2 at once); Airtop Free (3 at once).
Browser Use: Requests are rejected with 429
A request rate above the limit is refused.
- Pay as you go: 25 requests per second
Creates, lists, updates, deletes, event reads, and full run reads max(25, 2 × stored concurrency) requests/second, capped at 100
Source: docs.browser-use.com/cloud/guides/concurrency
Checked 2026-11-11
Plans that clear it: Cloudflare Browser Run Workers Paid (30 requests per second).
Browser Use: Too many requests at once
Calls above the concurrency cap wait or are refused.
- Pay as you go: 10 at once
Start with 10 concurrent sessions.
Source: browser-use.com/pricing
Checked 2026-10-16
Plans that clear it: Anchor Browser Starter (25 at once); Airtop Professional (30 at once); Browserless Starter (40 at once).
Browserbase: Too many requests at once
Calls above the concurrency cap wait or are refused.
Free Plan $0/mo Get started with Browserbase. Explore and prototype ideas. Infrastructure 3 concurrent browsers 1 browser hour
Source: browserbase.com/pricing
Developer Plan $20/mo Build and test real workflows. Prepare for production. Infrastructure 25 concurrent browsers 100 browser hours then $0.12/browser hr
Source: browserbase.com/pricing
Startup Plan $99/mo Run in production with room to grow and scale usage. Infrastructure 100 concurrent browsers 500 browser hours then $0.10/browser hr
Source: browserbase.com/pricing
Checked 2026-11-11
Plans that clear it: Kernel Start-up (150 at once); Anchor Browser Growth (200 at once).
Browserless: Credits run out
No extra usage: when the included credits are used up, calls stop until the next period or a new plan.
- Free: no extra usage
Free plans will actively reject incoming requests after the threshold is met.
Source: browserless.io/pricing
Checked 2026-11-11
Plans that clear it: Anchor Browser Starter (extra usage allowed); Anchor Browser Team (extra usage allowed); Anchor Browser Growth (extra usage allowed).
Browserless: Too many requests at once
Calls above the concurrency cap wait or are refused.
- Free: 2 at once
- Prototyping: 5 at once
- Prototyping: 10 at once
- Starter: 30 at once
- Starter: 40 at once
- Scale: 80 at once
- Scale: 100 at once
2 max concurrent browsers
Source: browserless.io/pricing
prototyping:{name:"Prototyping",calls:2e4,monthlyConcurrency:5,yearlyConcurrency:10,monthlyPrice:35,yearlyPrice:25
Source: browserless.io/_next/static/chunks/pages/pricing-bcac00ace4f188c8.js
starter:{name:"Starter",calls:18e4,monthlyConcurrency:30,yearlyConcurrency:40,monthlyPrice:200,yearlyPrice:140
Source: browserless.io/_next/static/chunks/pages/pricing-bcac00ace4f188c8.js
Checked 2026-11-11
Plans that clear it: Kernel Start-up (150 at once); Anchor Browser Growth (200 at once).
Cloudflare Browser Run: Credits run out
No extra usage: when the included credits are used up, calls stop until the next period or a new plan.
- Workers Free: no extra usage
Workers Free plan accounts are limited to 10 minutes of Browser Run usage per day. If you exceed that limit, you will receive a 429 error until the next UTC day.
Source: developers.cloudflare.com/browser-run/limits/
Checked 2026-11-11
Plans that clear it: Anchor Browser Starter (extra usage allowed); Anchor Browser Team (extra usage allowed); Anchor Browser Growth (extra usage allowed).
Cloudflare Browser Run: Requests are rejected with 429
A request rate above the limit is refused.
- Workers Free: 6 requests per minute
- Workers Paid: 30 requests per second
Total requests (Quick Actions only) 3 1 every 10 seconds
Source: developers.cloudflare.com/browser-run/limits/
Total requests per second (Quick Actions only) 3 30 per second
Source: developers.cloudflare.com/browser-run/limits/
Checked 2026-11-11
Cloudflare Browser Run: Too many requests at once
Calls above the concurrency cap wait or are refused.
- Workers Free: 3 at once
- Workers Paid: 10 at once
Concurrent browsers (Browser Sessions only) 3 browsers 10 browsers ( averaged monthly ), then $2.00 per additional browser
Source: developers.cloudflare.com/browser-rendering/pricing/
Checked 2026-11-11
Plans that clear it: Anchor Browser Starter (25 at once); Airtop Professional (30 at once); Browserless Starter (40 at once).
Hyperbrowser: Too many requests at once
Calls above the concurrency cap wait or are refused.
All four products · 1 concurrent session · 7 days of data retention
Source: hyperbrowser.ai/pricing
30,000 credits for all four products 25 concurrent sessions
Source: hyperbrowser.ai/pricing
100,000 credits for all four products 100 concurrent sessions
Source: hyperbrowser.ai/pricing
Checked 2026-11-11
Plans that clear it: Kernel Start-up (150 at once); Anchor Browser Growth (200 at once).
Kernel: Too many requests at once
Calls above the concurrency cap wait or are refused.
5 concurrent browsers
Source: kernel.sh/pricing
10 concurrent browsers unlimited proxy usage
Source: kernel.sh/pricing
150 concurrent browsers custom (byo) proxies
Source: kernel.sh/pricing
Checked 2026-11-11
Plans that clear it: Anchor Browser Growth (200 at once).
Lightpanda: Credits run out
No extra usage: when the included credits are used up, calls stop until the next period or a new plan.
- Explorer: no extra usage
The free plan stops until its monthly pool resets.
Source: lightpanda.io/docs/run-on-lightpanda-cloud/limits-and-billing
Checked 2026-11-11
Plans that clear it: Anchor Browser Starter (extra usage allowed); Anchor Browser Team (extra usage allowed); Anchor Browser Growth (extra usage allowed).
Lightpanda: Too many requests at once
Calls above the concurrency cap wait or are refused.
10 browser hours per month 5 concurrent sessions Community support (Discord)
Source: lightpanda.io/pricing
300 browser hours per month 30 concurrent sessions Email + Slack support
Source: lightpanda.io/pricing
Checked 2026-11-11
Plans that clear it: Browserless Starter (40 at once); Anchor Browser Team (50 at once); Browserless Scale (80 at once).
Steel: Requests are rejected with 429
A request rate above the limit is refused.
Requests per minute 60 600 Custom
Source: steel.dev/pricing
Checked 2026-11-11
Plans that clear it: Browser Use Pay as you go (25 requests per second); Cloudflare Browser Run Workers Paid (30 requests per second).
Steel: Too many requests at once
Calls above the concurrency cap wait or are refused.
Concurrent browser sessions 10 100 1,000+
Source: steel.dev/pricing
Checked 2026-11-11
Plans that clear it: Kernel Start-up (150 at once); Anchor Browser Growth (200 at once).
ZenRows: Credits run out
No extra usage: when the included credits are used up, calls stop until the next period or a new plan.
- Free: no extra usage
On Free there are no top-ups: you wait for the next monthly refresh or upgrade to a paid plan.
Source: zenrows.com/pricing
Checked 2026-11-11
Plans that clear it: Anchor Browser Starter (extra usage allowed); Anchor Browser Team (extra usage allowed); Anchor Browser Growth (extra usage allowed).
ZenRows: Too many requests at once
Calls above the concurrency cap wait or are refused.
- Free: 5 at once
Free Test everything. $ 0 /mo 5,000 credits/month · no card Everything unlocked except standalone Residential Proxies 5 concurrent requests Community support
Source: zenrows.com/pricing
Checked 2026-11-11
Plans that clear it: Browser Use Pay as you go (10 at once); Anchor Browser Starter (25 at once); Airtop Professional (30 at once).