diff --git a/Gemfile b/Gemfile
index bb944a6b..63850688 100644
--- a/Gemfile
+++ b/Gemfile
@@ -13,6 +13,7 @@ gem 'pg', '~> 1.4'
 gem 'json_translate', '~> 4.0.0'
 gem 'devise', '~> 4.9.1'
 gem 'devise-i18n', '~> 1.11.0'
+gem 'invisible_captcha', '~> 2.3.0'
 gem 'http_accept_language', '~> 2.1.1'
 gem 'kaminari', '~> 1.2.1'
 gem 'simple_form', '~> 5.0.2'
diff --git a/Gemfile.lock b/Gemfile.lock
index dfe6a661..c36831f5 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -183,6 +183,8 @@ GEM
       has_scope (>= 0.6)
       railties (>= 6.0)
       responders (>= 2)
+    invisible_captcha (2.3.0)
+      rails (>= 5.2)
     jmespath (1.6.2)
     jquery-rails (4.4.0)
       rails-dom-testing (>= 1, < 3)
@@ -450,6 +452,7 @@ DEPENDENCIES
   has_scope (~> 0.7.2)
   http_accept_language (~> 2.1.1)
   image_processing (~> 1.12)
+  invisible_captcha (~> 2.3.0)
   jquery-rails (~> 4.4.0)
   json_translate (~> 4.0.0)
   kaminari (~> 1.2.1)
diff --git a/app/controllers/users_controller.rb b/app/controllers/users_controller.rb
index 689adef3..4ce00906 100644
--- a/app/controllers/users_controller.rb
+++ b/app/controllers/users_controller.rb
@@ -3,6 +3,8 @@ class UsersController < ApplicationController
   before_action :user_should_be_confirmed, except: %i[signup create please_confirm]
   before_action :member_should_exist_and_be_active, except: %i[signup create edit show update please_confirm]
 
+  invisible_captcha if: -> { params[:from_signup].present? }
+
   has_scope :tagged_with, as: :tag
 
   def index
diff --git a/app/views/users/_form.html.erb b/app/views/users/_form.html.erb
index 56118ff5..02a25a05 100644
--- a/app/views/users/_form.html.erb
+++ b/app/views/users/_form.html.erb
@@ -1,6 +1,7 @@
 <%= show_error_messages!(@user) %>
 <%= simple_form_for @user do |f| %>
   <%= f.hidden_field :locale, value: I18n.locale %>
+  <%= invisible_captcha %>
 
   <div class="form-inputs">
     <%= f.input :username %>
diff --git a/config/initializers/invisible_captcha.rb b/config/initializers/invisible_captcha.rb
new file mode 100644
index 00000000..30eeb9ef
--- /dev/null
+++ b/config/initializers/invisible_captcha.rb
@@ -0,0 +1,4 @@
+InvisibleCaptcha.setup do |config|
+  config.timestamp_enabled = !Rails.env.test?
+  config.spinner_enabled = !Rails.env.test?
+end