Vision AI reCAPTCHA Solver

AI powered reCAPTCHA solver for reCAPTCHA v2 and v3 using YOLO based vision models (57k images dataset). The library provides both synchronous and asynchronous APIs, to automate image challenge solving and token extraction.

https://github.com/user-attachments/assets/3d0de5bd-6bbd-4a1a-bb06-fd7efa9d55fd

Key features

• Supports reCAPTCHA v2 image challenges (3x3 selection, 3x3 dynamic, 4x4 square) and v3 invisible flows
• Synchronous and asynchronous solver APIs with context manager support
• Configurable proxy, browser path, timeouts, and detection thresholds
• CLI for quick testing and automation
• Works in headless mode
• Automatic model warmup and background initialization
• Automatic model downloads on first run (classification + detection)

How it works

1. recaptcha-domain-replicator spins up a local HTTPS server and replicates the target reCAPTCHA widget.
2. A Chromium browser session is launched and the checkbox/challenge is interacted with automatically.
3. Challenge images are downloaded and analyzed by YOLO models:
4. Classification model for 3x3 challenges
5. Detection model for 4x4 challenges
6. The solver clicks the predicted tiles, submits verification, and extracts the token.

RecaptchaDomainReplicator usage

This project uses RecaptchaDomainReplicator (from recaptcha-domain-replicator) to build the local replica page and launch the browser session. It creates a new replicator, starts a local HTTPS server, and returns the browser instance plus a token handle.

Requirements

• Python 3.10 or newer
• Browser: Chromium based browser (Chrome for Testing, Edge)
• For credential proxies: Use Chrome for Testing or Microsoft Edge (Newer versions of Google Chrome doesn't support this)
• Admin privileges (optional): Required only for hosts file changes and port forwarding

Installation

pip install vision-ai-recaptcha-solver

From source (recommended for development):

python -m venv .venv
.venv\Scripts\activate
pip install -e ".[dev]"

Quick start (synchronous)

from vision_ai_recaptcha_solver import RecaptchaSolver, SolverConfig

config = SolverConfig(
    timeout=200,
    # Optional: point to a specific Chromium binary
    # browser_path="path/to/chrome.exe",
    # proxy="http://username:password@ip:port",
)

with RecaptchaSolver(config) as solver:
    result = solver.solve(
        website_key="your_site_key",
        website_url="https://example.com/your-page-with-recaptcha",
    )

print(result.token)
print(result.captcha_type.value)
print(result.time_taken)
print(result.attempts)

Invisible reCAPTCHA (v3)

from vision_ai_recaptcha_solver import RecaptchaSolver, SolverConfig

config = SolverConfig(timeout=120)

with RecaptchaSolver(config) as solver:
    result = solver.solve(
        website_key="your_site_key",
        website_url="https://example.com/login",
        is_invisible=True,
        action="login",
        is_enterprise=False,
        api_domain="google.com",
        cookies=None,
        user_agent=None,
    )

print(result.token)

Async usage

import asyncio
from pathlib import Path

from vision_ai_recaptcha_solver import AsyncRecaptchaSolver, SolverConfig

async def main():
    config = SolverConfig(
        timeout=180,
        server_port=8443,
        download_dir=Path("tmp1"),
    )

    async with AsyncRecaptchaSolver(config) as solver:
        result = await solver.solve(
            website_key="your_site_key",
            website_url="https://example.com/your-page-with-recaptcha",
        )
        print(result.token)

asyncio.run(main())

Concurrent async solves

Each solver instance should use a distinct server_port and download_dir to avoid conflicts.

import asyncio
from pathlib import Path

from vision_ai_recaptcha_solver import AsyncRecaptchaSolver, SolverConfig

async def solve_one(name: str, config: SolverConfig):
    async with AsyncRecaptchaSolver(config) as solver:
        result = await solver.solve(
            website_key="your_site_key",
            website_url="https://example.com/your-page-with-recaptcha",
        )
        return name, result

async def main():
    config_a = SolverConfig(server_port=8443, download_dir=Path("tmp-a"))
    config_b = SolverConfig(server_port=8444, download_dir=Path("tmp-b"))

    results = await asyncio.gather(
        solve_one("A", config_a),
        solve_one("B", config_b),
    )

    for name, result in results:
        print(name, result.captcha_type.value, result.time_taken)

asyncio.run(main())

CLI

The package exposes a console script:

vision-ai-recaptcha-solver --help

Solve a captcha:

vision-ai-recaptcha-solver solve \
  --website-key "your_site_key" \
  --website-url "https://example.com/your-page-with-recaptcha" \
  --no-headless \
  --timeout 180 \
  --output json

Solve invisible reCAPTCHA (v3):

vision-ai-recaptcha-solver solve \
  --website-key "your_site_key" \
  --website-url "https://example.com/login" \
  --invisible \
  --action "login"

Run a demo against Google's test page:

vision-ai-recaptcha-solver demo

Configuration reference

SolverConfig controls runtime behavior and validation.

Option	Default	Description
model_path	None	Path to the classification ONNX model. If None, auto downloads from Hugging Face.
detection_model_path	None	Path to detection model. If None, uses yolo12x.pt.
download_dir	Path("tmp")	Directory for downloaded images and temp files.
server_port	8443	Local HTTPS port used by the replicator.
proxy	None	Proxy URL in protocol://[user:pass@]host:port format.
browser_path	None	Path to Chromium executable. Auto detected if omitted.
headless	False	Run browser in headless mode.
timeout	300.0	Max seconds to wait for token extraction.
max_attempts	12	Max attempts for solving a challenge.
human_delay_mean	0.2	Mean delay in seconds between interactions.
human_delay_sigma	0.1	Standard deviation for human like delays.
log_level	"WARNING"	Logging level (DEBUG, INFO, WARNING, ERROR, CRITICAL).
persist_html	False	Persist the generated HTML replicas.
verbose	False	Enable verbose output.
conf_threshold	0.7	Tile classification confidence threshold.
min_confidence_threshold	0.2	Minimum confidence for top 3 tiles (3x3).
fourth_cell_threshold	0.7	Confidence threshold to include 4th cell.
detection_conf_threshold	0.6	Confidence threshold for 4x4 detection.
default_timeout	10.0	Default timeout for browser operations.
image_download_retries	3	Image download retries.
image_download_retry_delay	1.0	Base delay between retries.
register_signal_handlers	True	Register SIGINT/SIGTERM handlers for cleanup.
cleanup_tmp_on_close	True	Delete download_dir when solver closes.

Solve parameters

Both RecaptchaSolver.solve() and AsyncRecaptchaSolver.solve() support:

• website_key: reCAPTCHA site key (required)
• website_url: URL containing the challenge (required)
• is_invisible: Whether this is invisible/v3 (default False)
• action: Action name for invisible reCAPTCHA (optional)
• is_enterprise: Whether this is enterprise reCAPTCHA (default False)
• api_domain: google.com or recaptcha.net (default google.com)
• bypass_domain_check: Skip domain verification (default True)
• use_ssl: Use HTTPS for local server (default True)
• cookies: Optional list of cookie dictionaries to set before solving
• user_agent: Optional custom user agent string

Result object

SolveResult is returned for successful solves:

• token: reCAPTCHA response token
• cookies: cookies from the browser session
• time_taken: wall clock time in seconds
• captcha_type: one of dynamic_3x3, selection_3x3, square_4x4, invisible, no_challenge, unknown
• attempts: number of solve attempts

Model assets

• Classification model: recaptcha_classification_57k.onnx
• Trained on a 57k images dataset.
• Auto downloaded on first use from Hugging Face if not present.
• Override with SolverConfig(model_path=...).
• Detection model: yolo12x.pt
• Loaded by ultralytics (auto downloaded if not present).
• Override with SolverConfig(detection_model_path=...).

Example scripts

The repo includes two runnable demos that hit Google's public test page and show token extraction timing and captcha type detection. Treat them as templates.

• demo.py: synchronous solve with RecaptchaSolver
• Run: python demo.py
• demo_async.py: async workflows with AsyncRecaptchaSolver
• Option 1 runs two solves concurrently
• Option 2 runs a solve in the background while other tasks execute
• Run: python demo_async.py

Development

Run tests:

pytest

Project layout

• src/vision_ai_recaptcha_solver/ - core library
• src/vision_ai_recaptcha_solver/captcha/ - handlers for challenge types
• src/vision_ai_recaptcha_solver/detector/ - YOLO model integration
• src/vision_ai_recaptcha_solver/models/ - model assets
• tests/ - unit tests
• demo.py, demo_async.py - example scripts

Troubleshooting

• browser_path does not exist: Pass a valid Chromium executable path in SolverConfig(browser_path=...). On Windows, the path should end with .exe.
• Invalid proxy URL format: Proxy must be protocol://[user:pass@]host:port. Supported protocols: http, https, socks4, socks5. [] means optional.
• CaptchaNotFoundError or ElementNotFoundError: Confirm website_url points to a page that renders the reCAPTCHA iframe and that the website_key matches that page.
• Port or temp directory conflicts: When running multiple solvers, set unique server_port and download_dir values, or let them auto-select by not setting those fields explicitly.

Legal & Responsible Use

RecaptchaDomainReplicator is provided for educational and research purposes. Use responsibly and comply with all applicable laws and terms of service.

License

This project is licensed under the MIT License.