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Ruby API for ZeroCaptcha (Captcha Solver as a Service for the Enterprise)
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Developed by Infosimples, a brazilian company that offers data extraction solutions and Ruby on Rails development.


ZeroCaptcha is a Ruby API for an enterprise captcha solving service developed by Infosimples that is 100% powered by artificial intelligence software.


Add this line to your application's Gemfile:

gem 'zero_captcha', '~> 1.0.0'

And then execute:

$ bundle

Or install it yourself as:

$ gem install zero_captcha


  1. Create a client
# Create a client
client ='mytoken')
  1. Solve a captcha

There are two methods available: decode and decode! * decode doesn't raise exceptions. * decode! may raise a ZeroCaptcha::Error if something goes wrong.

If the solution is not available, an empty captcha object will be returned.

captcha = client.decode(url: '', solver: 'captcha-type-1')
captcha.text        # Solution of the captcha          # Numeric ID of the captcha solved by ZeroCaptcha
captcha.correct?    # true if the solution is correct
captcha.duration    # How long it took to solve the captcha in milliseconds.

You can also specify path, file, raw and raw64 when decoding an image.

client.decode(path: 'path/to/my/captcha/file', solver: 'captcha-type-1')

client.decode(file:'path/to/my/captcha/file', 'rb'), solver: 'captcha-type-1')

client.decode(raw:'path/to/my/captcha/file', 'rb').read, solver: 'captcha-type-1')

client.decode(raw64: Base64.encode64('path/to/my/captcha/file', 'rb').read), solver: 'captcha-type-1')

Internally, the gem will always convert the image to raw64 (binary base64 encoded).

  1. Report incorrectly solved captcha for refund
captcha = client.report_incorrect(130920620) # with 130920620 as the captcha id

Warning: do not abuse on this method, otherwise you may get banned

  1. Report correctly solved captcha for statistics
captcha = client.report_correct(130920620) # with 130920620 as the captcha id



The API is thread-safe, which means it is perfectly fine to share a client instance between multiple threads.

Ruby dependencies

ZeroCaptcha don't require specific dependencies. That saves you memory and avoid conflicts with other gems.

Input image format

Any format you use in the decode method (url, file, path, raw, raw64) will always be converted to a raw64, which is a binary base64 encoded string. So, if you already have this format available on your side, there's no need to do convertions before calling the API.

Our recomendation is to never convert your image format, unless needed. Let the gem convert internally. It may save you resources (CPU, memory and IO).


ZeroCaptcha gem uses Semantic Versioning.

Ruby versions

This gem has been tested with the following versions of Ruby:

  • MRI 2.2.2
  • MRI 2.2.0
  • MRI 2.1.5
  • MRI 2.0.0
  • MRI 1.9.3



  1. Fork it ( )
  2. Create your feature branch (git checkout -b my-new-feature)
  3. Run/add tests (RSpec)
  4. Commit your changes (git commit -am 'Add some feature')
  5. Push to the branch (git push origin my-new-feature)
  6. Create a new Pull Request
  7. Yay. Thanks for contributing :)

All contributors:


MIT License. Copyright (C) 2011-2015 Infosimples.

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