The best open-source antidetect browser in 2026 is AliasMode. It is a complete desktop profile manager under the permissive Apache-2.0 licence, with a separate fingerprint and proxy per profile, free hosted team sync, an AdsPower-compatible Local API, and an MCP server. Donut Browser is the best choice on macOS and Linux. Camoufox is the best open-source engine for developers. Most other open-source projects are automation libraries, not browsers you can hand to a team.
AdsPower-compatible Local API, Playwright over CDP, MCP
Donut Browser
AGPL-3.0
Desktop antidetect browser and profile manager
Yes
Yes
Self-hosted
REST API, MCP
Camoufox
MPL-2.0
Patched Firefox engine with a Python library
No
Set in code at each launch
No
Playwright-compatible
Patchright
Apache-2.0
Patched Playwright for Chromium
No
No. You manage it in code
No
Playwright API in Python, Node, and .NET
nodriver
AGPL-3.0
Async Python automation library
No
No. You manage it in code
No
Python API
fingerprint-suite
Apache-2.0
Fingerprint generator and injector packages
No
Fingerprint only, in code
No
Playwright and Puppeteer
undetected-chromedriver
GPL-3.0
Patched Selenium ChromeDriver
No
No
No
Selenium
#1 open-source antidetect browser
AliasMode
AliasMode's GitHub repository holds the complete desktop application: the dashboard, the local runtime, the Local API, and the MCP server, all under Apache-2.0. You can read it, build it, and fork it without copyleft duties. It replaces a paid tool such as AdsPower or Multilogin for daily work, and non-developers can use it, which is rare in open-source antidetect software.
Apache-2.0: a permissive licence that companies can build on.
A full GUI profile manager, not a library that needs code.
Free hosted team sync. No server to run.
AdsPower-compatible Local API plus Playwright over CDP.
MCP server in the installer for Claude, ChatGPT, and Codex.
AliasMode is built and maintained by the Xreacher team, so this is our own product ranked first. Comparisons use the dated sources listed below, with third-party pricing estimates identified separately. Check live plans before buying.
Ranking
The 7 best open-source antidetect browsers and tools
The order puts complete antidetect browsers first, then engines, then libraries. A library can hide automation signals, but it does not give a team persistent profiles to work in.
A complete open-source antidetect browser for Windows. Each profile has its own fingerprint, cookies, storage, and HTTP or SOCKS5 proxy. Profiles live in local SQLite in Local mode, with no account. AliasMode Cloud adds free encrypted profile sync, workspaces with owner and member roles, and device revocation. Active development: release v0.1.0-beta.49 shipped on September 13, 2026.
Best for
Teams that want an open-source AdsPower or Multilogin replacement
Companies that need a permissive licence
AI agent and Playwright workflows
Not best for
macOS and Linux users who need a native installer
Users who want every component, including the engine, under one licence
#2
Donut Browser
Best on macOS and Linux
Donut Browser is a desktop antidetect browser under AGPL-3.0 with about 3,900 GitHub stars. It runs on macOS, Windows, and Linux and uses Wayfern, a Chromium fork with fingerprint controls. Profiles have no cap. It has a REST API, an MCP server, and optional end-to-end encrypted sync that you host yourself.
Best for
macOS and Linux desktops
Users who prefer to self-host sync
Not best for
Teams that do not want to run a sync server
Products that cannot accept AGPL copyleft terms
Existing AdsPower API scripts
#3
Camoufox
Best engine for developers
Camoufox is a Firefox build patched at the C++ level, with about 12,000 GitHub stars and an MPL-2.0 licence. You drive it from Python through a Playwright-compatible library, and it generates a fingerprint at each launch. It is an engine, not a profile manager: storing profiles, proxies, and sessions is your job.
Best for
Python scraping and testing
Developers who want a Firefox-based fingerprint
Not best for
Non-developers
Teams that need saved profiles, groups, and sync
#4
Patchright
Drop-in Playwright patch
Patchright is a patched Playwright under Apache-2.0 for Python, Node, and .NET. It removes common automation signals in Chromium. It does not create fingerprints or manage profiles, so it works best inside a browser that already does.
Best for
Existing Playwright code bases
Headless automation at small scale
Not best for
Multi-account work by hand
Anyone who needs a fingerprint per profile
#5
nodriver
Python without WebDriver
nodriver is the successor to undetected-chromedriver. It is an async Python library under AGPL-3.0 that talks to Chrome directly, without Selenium or WebDriver. It can keep a user data folder between runs, but it has no fingerprint or proxy manager.
Best for
Python developers
Single-session automation
Not best for
Teams
Profiles that need different fingerprints
#6
fingerprint-suite
Fingerprint building blocks
Apify's fingerprint-suite is a set of Apache-2.0 npm packages that generate realistic headers and fingerprints and inject them into Playwright or Puppeteer. It is a part for your own tool, not a tool in itself.
Best for
Engineers who build their own scraping stack
Node.js projects
Not best for
Account management
Non-developers
#7
undetected-chromedriver
Selenium classic
A patched Selenium ChromeDriver under GPL-3.0 with about 12,800 GitHub stars. It is widely used in older code. Its author points new projects to nodriver, and it does not change your IP or fingerprint.
Best for
Legacy Selenium scripts
Not best for
New projects
Multi-account work
Which open-source antidetect browser fits you?
Need
Pick
Why
A team tool that replaces a paid antidetect browser
AliasMode
GUI, saved profiles, per-profile proxies, and free hosted team sync.
A permissive licence for company use
AliasMode
Apache-2.0 has no copyleft duty. Donut Browser and nodriver are AGPL-3.0.
Native app on macOS or Linux
Donut Browser
It ships installers for all three desktop systems.
A Firefox-based engine in Python
Camoufox
It patches Firefox at the C++ level and follows the Playwright API.
Patch an existing Playwright project
Patchright
It is a drop-in replacement for the Playwright package.
What makes an antidetect browser open source?
An antidetect browser is open source when the code that manages your profiles, cookies, and proxies is public under a recognized licence, so that you can read it, build it, and change it. That matters here more than in most software. The tool holds logged-in sessions for every account you run. With closed-source tools you trust a vendor's statement about where that data goes. With open-source tools you can check.
Fully open, partly open, and source-available
Read the licence scope, not the badge. Some projects publish a wrapper or a launcher under MIT while the patched browser engine is a closed binary. CloakBrowser, BotBrowser, and ShardBrowser work this way. AliasMode is plain about its own boundary: the complete desktop application is Apache-2.0, the CloakBrowser engine it drives is a third-party component under its own licence and is bundled at no cost, and AliasMode Cloud is an optional hosted service. Commercial tools such as Kameleo publish SDKs on GitHub, but the product is closed source.
Fully open: app and engine source are public (Camoufox, Patchright)
Open app, third-party engine: AliasMode, and Donut Browser with Wayfern
Open wrapper, closed engine: CloakBrowser, BotBrowser, ShardBrowser
Closed source with public SDKs: Kameleo and other paid tools
Apache-2.0, MPL-2.0, and AGPL-3.0 in plain words
The licence decides what you can do with the code. Apache-2.0 is permissive: you can use, change, and ship the code inside your own product, and it includes a patent grant. MPL-2.0 asks you to share changes to the files you modify. AGPL-3.0 is strong copyleft: if you change the software and let users reach it over a network, you must publish your full source. Agencies that build internal tools on an antidetect browser usually want Apache-2.0. That is the licence AliasMode uses.
Privacy browsers are not antidetect browsers
Lists of open-source antidetect browsers often include Tor Browser, Mullvad Browser, Brave, LibreWolf, and Ungoogled Chromium. These are good privacy browsers, but they solve a different problem. Tor Browser and Mullvad Browser make every user look the same, so nobody stands out. An antidetect browser does the opposite: it makes each profile look like a different, stable device. Privacy browsers can offer separate profiles or containers, but those features are not the same as assigning and managing a stable fingerprint and proxy for every account.
Libraries hide automation. Browsers hold identities.
Patchright, nodriver, and undetected-chromedriver remove signals that show a browser is driven by code. They do not give each account a stable device identity. For multi-account work you need both layers: a profile manager that keeps the fingerprint, cookies, and proxy of each account fixed, and an automation layer on top. AliasMode covers both. Each running profile exposes CDP, so Playwright attaches to it, and the MCP server gives AI agents the same control.
An antidetect browser still needs one proxy per profile
An antidetect browser separates cookies, storage, and the browser fingerprint. It does not change your IP address. If ten profiles share one home connection, a platform still sees ten accounts on one network. Give each profile its own dedicated static residential IP and keep that pairing fixed. AliasMode takes one HTTP or SOCKS5 proxy per profile, tests it, and sets the profile timezone from the proxy location. We use NobleProxy for this layer.
One profile, one account, one dedicated static IP
Match timezone and language to the proxy country
Do not rotate the IP of an account that logs in every day
AliasMode is a public Windows beta. The installer supports Windows 10, Windows 11, and Windows Server 2019 or newer. On macOS it runs from source only, and there is no native Linux app. The installer is not code signed yet, so Windows SmartScreen can ask for approval. AliasMode does not sell proxies and has no Android cloud phones. If you need one of those today, a paid tool in this list fits better. If you work on Windows and want zero licence cost, AliasMode is the first tool to try.
Sources
Sources and pricing references
Plans and limits change often. Sources include official product pages and repositories. Third-party pricing references are identified separately.
Yes. AliasMode (Apache-2.0) and Donut Browser (AGPL-3.0) are complete open-source antidetect browsers with a GUI, saved profiles, and a proxy per profile. Camoufox is an open-source patched Firefox engine for developers.
What is the best open-source alternative to Multilogin, GoLogin, or AdsPower?
AliasMode. It covers the same daily job: separate fingerprints, cookies, and proxies per profile, groups, team sync, and an API. Its Local API follows the AdsPower request shape, so many AdsPower scripts work with small changes. It is free with no profile cap.
Is AliasMode fully open source?
The complete desktop application is open source under Apache-2.0: dashboard, local runtime, Local API, and MCP server. The CloakBrowser engine that it drives is a third-party component under its own licence, bundled at no cost. AliasMode Cloud is an optional hosted service. Local mode works without it.
Is Camoufox an antidetect browser?
Camoufox is an antidetect browser engine. It is a patched Firefox that you control from Python. It has no profile manager, no groups, and no sync, so it fits developers who build their own tooling. Teams that open profiles by hand need a manager such as AliasMode or Donut Browser.
AliasMode or Donut Browser: which one should I use?
Use AliasMode on Windows, for a permissive Apache-2.0 licence, for free hosted team sync, and for AdsPower-compatible scripts. Use Donut Browser if you need a native macOS or Linux app today and you are happy to self-host sync under AGPL-3.0.
Are open-source antidetect browsers safe?
Open source lets you and others inspect how sessions and proxies are handled, which closed tools do not allow. Download only from the official repository or site and check the published hash. Avoid unknown repositories that ship only an .exe file and ask you to turn off antivirus protection.