Antidetect Browsers With Free Tiers + REST APIs, Compared

A Puppeteer script that keeps getting blocked on a data collection project can have fingerprints and residential proxies that look fine on paper. A common cause is connecting to a standard Chrome instance while assuming the antidetect browser's fingerprint settings carry over.

They don't.

The difference matters: antidetect browsers built for operators (affiliate marketers, e-commerce sellers) and antidetect browsers built for developers are fundamentally different products. Most tools in this category were designed for people who click buttons in a GUI — not for engineers who want to spin up 50 profiles from a CI pipeline at 3am.

This guide covers the antidetect browsers with REST APIs and SDK support, which ones have free tiers worth using, and what the actual integration process looks like.

Why Developers Need Antidetect Browsers (Not Just Operators)

The typical antidetect browser pitch goes something like: "Run multiple accounts side by side." And sure, that's the operator use case. But developers have different problems.

Web scraping at scale runs into fingerprint-based blocking before it hits IP-based blocking. Platforms like Cloudflare, PerimeterX, and DataDome check canvas fingerprints, WebGL renderer strings, and dozens of other browser signals. Rotating IPs helps — but if every request comes from a browser with identical fingerprint characteristics, the blocking system notices fast. (If you're building data pipelines that feed into analytics dashboards, JustAnalytics can help visualize the data you're collecting.)

QA automation needs multiple browser configurations. Testing how your app renders for a Windows user in Germany versus a Mac user in Japan means more than just changing the User-Agent string. You need consistent, realistic fingerprint profiles.

Ad verification requires geo-distributed, device-diverse browser profiles to check how ads render across different user segments. (This pairs well with click fraud detection tools like ClickzProtect if you're validating both the ad rendering and the traffic quality.)

Account testing for SaaS products often requires isolated browser environments. If you're building multi-tenant software and need to test how different accounts interact — cookie isolation and fingerprint separation matter.

The common thread: you need programmatic control over browser fingerprints, and you need it to work with your existing automation stack.

Looking for JustBrowser's API reference? It lives at justbrowser.app/docs — 108 operations with parameters, request and response bodies and error codes, plus the raw OpenAPI document at /docs/openapi.json. Two things worth knowing before your first call: the API is local, bound to 127.0.0.1:36542 (there is no hosted endpoint), and POST /profiles/{id}/start starts headless unless you send {"headless": false}.

Core Concepts: What Makes an Antidetect Browser Developer-Friendly

Before comparing specific tools, here's what matters for developer workflows:

REST API access. Can you create, launch, and manage profiles via HTTP calls? This is table stakes for CI/CD integration and headless automation.

CDP (Chrome DevTools Protocol) support. Playwright and Puppeteer connect to browsers via CDP's WebSocket endpoint. An antidetect browser needs to expose this endpoint with the fingerprint spoofing active.

Headless mode. Running without a GUI is essential for server-side automation. But headless detection is a real thing — platforms check for headless signals. A good antidetect browser patches these signals even in headless mode. Most don't do this well. It's frustrating.

Profile management via code. Creating a profile, configuring its fingerprint, assigning a proxy, launching it, grabbing the CDP endpoint, and shutting it down — all via API. If any step requires the GUI, your automation breaks.

Selenium support. Some teams are locked into Selenium. WebDriver-based control needs a different integration path than CDP.

The Complete Process: Connecting Automation Frameworks

Here's how the integration actually works. I'll use JustBrowser as the primary example (because I know the API), with notes on how GoLogin and AdsPower differ.

Step 1: Create a Profile via REST API

// JustBrowser API example
const API = 'http://127.0.0.1:36542/api/v1';

const response = await fetch(`${API}/profiles`, {
  method: 'POST',
  headers: {
    'Authorization': `Bearer ${API_KEY}`,
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({
    name: 'scraper-profile-001',
    os: 'windows',
    browser: 'chrome',
    proxy: {
      type: 'http',
      host: 'proxy.example.com',
      port: 8080,
      username: 'user',
      password: 'pass'
    }
  })
});

const profile = await response.json();
// profile.data.id is what you'll use to launch

GoLogin's API is similar but requires a different auth flow (OAuth tokens vs API keys). AdsPower uses a local API server — you hit localhost:50325 rather than a cloud endpoint.

Step 2: Launch the Profile and Get CDP Endpoint

// Start the browser profile
const launchResponse = await fetch(
  `${API}/profiles/${profile.data.id}/start`,
  {
    method: 'POST',
    headers: { 'Authorization': `Bearer ${API_KEY}` }
  }
);

const { data } = await launchResponse.json();
const cdpUrl = data.cdp_url;
// cdpUrl looks like: ws://127.0.0.1:<port>/devtools/browser/abc123

This is where things get interesting. The browser launches locally on the Windows or Mac machine running JustBrowser, and the fingerprint configuration came from the API. The CDP endpoint lets your automation framework take over.

Step 3: Connect Playwright

const { chromium } = require('playwright');

const browser = await chromium.connectOverCDP(cdpUrl);
const context = browser.contexts()[0];
const page = context.pages()[0] || await context.newPage();

await page.goto('https://browserleaks.com/canvas');
// The canvas fingerprint will match the profile's spoofed config

Puppeteer works nearly identically:

const puppeteer = require('puppeteer-core');

const browser = await puppeteer.connect({
  browserWSEndpoint: cdpUrl
});

Step 4: Selenium Integration (Different Path)

Selenium doesn't use CDP directly. Instead, you start the profile, ask the API for that profile's debugger address, then point Selenium at it:

from selenium import webdriver
from selenium.webdriver.chrome.options import Options

options = Options()
# fetch the per-profile debugger address first
# GET http://127.0.0.1:36542/api/v1/profiles/{id}/selenium  (Authorization: Bearer <token>)
options.add_experimental_option("debuggerAddress", debugger_address)

driver = webdriver.Chrome(options=options)
driver.get("https://browserleaks.com/canvas")

The antidetect browser needs to be running before Selenium connects. Less elegant than CDP. Clunkier. But it works.

Step 5: Cleanup

// Stop the profile when done
await fetch(
  `${API}/profiles/${profile.data.id}/stop`,
  {
    method: 'POST',
    headers: { 'Authorization': `Bearer ${API_KEY}` }
  }
);

Always stop profiles when you're done. Running dozens of zombie browser instances is a resource drain and, for cloud-synced tools, might hit profile limits. Clean up after yourself. Future you will thank present you.

Free Tier Comparison: What You Actually Get

Here's the reality: none of the major antidetect browsers give you full REST API access for free. But the free tiers are still useful for development testing.

Tool	Free Tier	API Access	CDP Support	Headless	Best For
JustBrowser	None — 7-day full-access trial	Included ($9.99/mo)	Yes	Yes	Engineers needing clean API design
GoLogin	3 profiles	Paid only	Yes	Yes	General-purpose automation
AdsPower	2 profiles	Higher tiers	Yes	Limited	Teams already in AdsPower ecosystem
Multilogin	None	$99/mo+	Yes	Yes	Enterprise-scale ops

We don't have a free tier to put in that column — JustBrowser is a seven-day trial and then $9.99/mo, and the trial holds nothing back, so you're validating scripts against unlimited profiles and the live API rather than a crippled build. GoLogin's free tier gives you 3 profiles and no API. AdsPower's 2-profile free tier is barely enough for testing.

Here's my actual opinion, which might annoy people: if you're a developer evaluating these tools, skip the free tier comparison entirely. What matters is the API design, documentation quality, and whether the tool actually works with your automation framework. Sign up for a trial, run your scripts, and see what breaks. Free tier profiles are good for "does it install" — not for "will it survive production."

Advanced Tips for Automation Engineers

Status polling. JustBrowser's API has no webhooks — poll GET /profiles (or the profile's start response) to track launch state, and wrap your CDP session in reconnection logic to catch crashes.

DNS-over-HTTPS per profile. JustBrowser supports per-profile DNS settings (Cloudflare, Google, Quad9). This matters if you're testing geo-specific behavior where DNS responses differ by region.

Profile aging. For long-running automation and testing (like keeping a QA or client account session stable), look for tools with cookie warm-up and browsing history simulation. Creating a profile and immediately hitting a protected site can trigger extra checks — and a rotating IP undermines a long-lived profile just as fast, which is why our step-by-step ISP-proxy setup for JustBrowser leans on static residential addresses for stable, long-lived sessions. JustBrowser has warm-up across 127 curated sites in 6 categories built in.

Fingerprint verification before production. Run your profiles through CreepJS, FingerprintJS Pro, and BrowserLeaks before deploying. JustBrowser's recorded results are CreepJS 0% stealth / 0% headless and BrowserLeaks WebRTC no leak, but your specific proxy + profile combination might leak signals — especially JA4 TLS fingerprinting at the network layer, which those browser-side tools never check. Trust but verify.

Error handling for CDP disconnections. Antidetect browser processes can crash. Your Playwright/Puppeteer code needs reconnection logic. Don't assume the CDP endpoint stays alive forever.

Common Mistakes Developers Make

Assuming the fingerprint persists across sessions without the antidetect browser. If you export cookies and import them to a regular Chrome instance, the fingerprint doesn't come with them. You need to launch through the antidetect tool every time — it's one of the myths that quietly cause detection problems.
Using datacenter proxies for detection-sensitive sites. Your fingerprint can be perfect, but a datacenter IP is often flagged. Budget for residential proxies. (If you're doing ad verification, pair with JustAnalytics to track what's actually rendering per-profile. For outbound sales teams running email campaigns across several sending identities, JustEmails handles deliverability while JustBrowser handles browser isolation.)
Running too many concurrent profiles. Each profile is a separate browser process. 20 profiles means 20 Chromium instances. Size your server accordingly — figure 500MB-1GB RAM per profile under load.
Ignoring profile updates. Browser fingerprint databases need regular updates to match current Chrome versions. If your antidetect tool isn't shipping updates every few weeks, your profiles will drift from the real browser population.
Hardcoding CDP ports. Use the cdp_url the API hands back on start. Hardcoding a fixed debugger port works until you try to run two profiles simultaneously.

Frequently Asked Questions

Which free antidetect browsers have REST API support?

JustBrowser has no free tier, but its REST API is included in the one $9.99/mo plan and is live during the 7-day trial, so you can automate against it before paying anything. GoLogin includes API on paid plans. AdsPower offers API on higher tiers. None of the major antidetect browsers include full REST API access on a free plan — automation means a paid plan or a trial, whichever vendor you pick.

Can I use Playwright with an antidetect browser?

Yes. JustBrowser, GoLogin, and AdsPower all support Playwright via Chrome DevTools Protocol (CDP). You launch the antidetect profile, grab the WebSocket debugger URL, and connect Playwright using connectOverCDP(). JustBrowser exposes this through its REST API; others require local browser launch first.

What's the difference between headless and headed antidetect automation?

Headed mode runs the full browser UI — slower but more realistic for detection-heavy platforms. Headless mode runs without UI, faster for scraping and testing. Most antidetect browsers support both, but headless with spoofed fingerprints is harder to get right. JustBrowser supports headless launch via CDP with fingerprint injection intact.

Are free antidetect browser tiers good enough for development testing?

For basic testing and proof-of-concept work, yes. JustBrowser is the odd one out here — there's no free tier, just a 7-day trial that withholds nothing, so you validate scripts against unlimited profiles and the real API rather than a cut-down version of the product. For production automation you'll be on a paid plan regardless of which tool you choose.

Try JustBrowser

Native Chromium antidetect browser — not extension-based. Real C++ engine patches at the canvas / WebGL / audio / font / screen layer, so 40+ identity parameters are genuine, not faked. REST API for Playwright, Puppeteer, Selenium. $9.99/month or $99.99/year. 7-day free trial, card required — cancel any time in the seven days and you are not charged. Unlimited profiles.

Get started → · How it differs from Multilogin / GoLogin / AdsPower · More guides on the JustBrowser blog

Best Free Antidetect Browsers for Developers: REST API Comparison