Add Livereload

development.rb

Rails.application.configure do
  # Add this line to the development.rb:

  config.middleware.insert_before Rack::Runtime, Rack::LiveReload
end

Gemfile

group :development do
  gem 'guard-livereload', '~> 2.5', require: false
  gem 'rack-livereload'
end

Guardfile

# You can create a Guardfile with 'guard init'

# A sample Guardfile
# More info at https://github.com/guard/guard#readme

## Uncomment and set this to only include directories you want to watch
# directories %w(app lib config test spec features) \
#  .select{|d| Dir.exists?(d) ? d : UI.warning('Directory #{d} does not exist')}

## Note: if you are using the `directories` clause above and you are not
## watching the project directory ('.'), then you will want to move
## the Guardfile to a watched dir and symlink it back, e.g.
#
#  $ mkdir config
#  $ mv Guardfile config/
#  $ ln -s config/Guardfile .
#
# and, you'll have to watch 'config/Guardfile' instead of 'Guardfile'

guard 'livereload' do
  extensions = {
    css: :css,
    scss: :css,
    sass: :css,
    js: :js,
    coffee: :js,
    html: :html,
    png: :png,
    gif: :gif,
    jpg: :jpg,
    jpeg: :jpeg
  }
  rails_view_exts = %w(erb haml slim)
  compiled_exts = extensions.values.uniq
  watch(%r{public/.+\.(#{compiled_exts * '|'})})
  extensions.each do |ext, type|
    watch(%r{
          (?:app|vendor)
          (?:/assets/\w+/(?<path>[^.]+) # path+base without extension
           (?<ext>\.#{ext})) # matching extension (must be first encountered)
          (?:\.\w+|$) # other extensions
          }x) do |m|
      path = m[1]
      "/assets/#{path}.#{type}"
    end
  end
  watch(%r{app/views/.+\.(#{rails_view_exts * '|'})$})
  watch(%r{app/helpers/.+\.rb})
  watch(%r{config/locales/.+\.yml})
end

After updating the above files:

1. Run "bundle install"
2. Run "gem install guard".
3. Run "guard" inside your project.
4. Open another tab and run "rails s"
5. Visit http://localhost:3000
6. If changes aren't caught, try refreshing the browser or restarting the rails server or restarting guard.