Use it with or without Phoenix.

Quick example. Configuration:

  config :recaptcha,
    public_key: {:system, "RECAPTCHA_PUBLIC_KEY"},
    secret: {:system, "RECAPTCHA_PRIVATE_KEY"}

And rendering:

<form name="someform" method="post" action="/somewhere">
  ...
  <%= raw Recaptcha.Template.display %>
  ...
</form>

That’s pretty straightforward: https://github.com/samueljseay/recaptcha