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  1. Mar 2023
  2. stackoverflow.com stackoverflow.com
    How to add OTP/Captcha for login in rails app
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    1. TylerRick 23 Mar 2023
      Unfortunately all SMS/voice gateway are owned by paid services, thus there is no such thing as open-source, that I can recommend.
      free (price) SMS online services paid services free services doesn't exist
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    stackoverflow.com/questions/30325448/how-to-add-otp-captcha-for-login-in-rails-app