diff --git a/Guardfile b/Guardfile
new file mode 100644
index 00000000..13788683
--- /dev/null
+++ b/Guardfile
@@ -0,0 +1,62 @@
+# frozen_string_literal: true
+# 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.exist?(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'
+
+# Note: The cmd option is now required due to the increasing number of ways
+#       rspec may be run, below are examples of the most common uses.
+#  * bundler: 'bundle exec rspec'
+#  * bundler binstubs: 'bin/rspec'
+#  * spring: 'bin/rspec' (This will use spring if running and you have
+#                          installed the spring binstubs per the docs)
+#  * zeus: 'zeus rspec' (requires the server to be started separately)
+#  * 'just' rspec: 'rspec'
+require 'guard/compat/plugin'
+
+SPEC_DIRS = ENV.fetch('SPEC_DIRS', 'spec features').split
+
+Guard::Compat::UI.info("spec_paths are #{SPEC_DIRS}")
+
+guard_options = {
+  cmd: 'bundle exec rspec',
+  # cmd: 'spring crystalball',
+  # run_all: { cmd: 'CRYSTALBALL=true rspec' },
+  all_on_start: true,
+  failed_mode: :focus,
+  spec_paths: SPEC_DIRS
+}
+
+guard :rspec, guard_options do
+  require 'guard/rspec/dsl'
+  dsl = Guard::RSpec::Dsl.new(self)
+
+  # RSpec files
+  rspec = dsl.rspec
+  watch(rspec.spec_helper) { rspec.spec_dir }
+  watch(rspec.spec_support) { rspec.spec_dir }
+  watch(rspec.spec_files)
+
+  # Ruby files
+  ruby = dsl.ruby
+  dsl.watch_spec_files_for(ruby.lib_files)
+
+  # Capybara features specs
+  # watch(rails.view_dirs)     { |m| rspec.spec.call('features/#{m[1]}') }
+  # watch(rails.layouts)       { |m| rspec.spec.call('features/#{m[1]}') }
+
+  # Turnip features and steps
+  watch('features')
+end
diff --git a/bin/guard b/bin/guard
new file mode 100755
index 00000000..bcb966f4
--- /dev/null
+++ b/bin/guard
@@ -0,0 +1,29 @@
+#!/usr/bin/env ruby
+# frozen_string_literal: true
+
+#
+# This file was generated by Bundler.
+#
+# The application 'guard' is installed as part of a gem, and
+# this file is here to facilitate running it.
+#
+
+require "pathname"
+ENV["BUNDLE_GEMFILE"] ||= File.expand_path("../../Gemfile",
+  Pathname.new(__FILE__).realpath)
+
+bundle_binstub = File.expand_path("../bundle", __FILE__)
+
+if File.file?(bundle_binstub)
+  if File.read(bundle_binstub, 300) =~ /This file was generated by Bundler/
+    load(bundle_binstub)
+  else
+    abort("Your `bin/bundle` was not generated by Bundler, so this binstub cannot run.
+Replace `bin/bundle` by running `bundle binstubs bundler --force`, then run this command again.")
+  end
+end
+
+require "rubygems"
+require "bundler/setup"
+
+load Gem.bin_path("guard", "guard")
diff --git a/crystalball.gemspec b/crystalball.gemspec
index 5069d505..b5b6e130 100644
--- a/crystalball.gemspec
+++ b/crystalball.gemspec
@@ -37,6 +37,7 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency 'actionview'
   spec.add_development_dependency 'activerecord'
   spec.add_development_dependency 'factory_bot'
+  spec.add_development_dependency 'guard-rspec'
   spec.add_development_dependency 'i18n'
   spec.add_development_dependency 'parser'
   spec.add_development_dependency 'pry'
diff --git a/docker-compose.yml b/docker-compose.yml
new file mode 100644
index 00000000..ecc53592
--- /dev/null
+++ b/docker-compose.yml
@@ -0,0 +1,23 @@
+version: '3.4'
+
+services:
+  crystalball:
+    command: bash -c "bundle install --no-binstubs && bin/guard start --force-polling --watchdir ${SPEC_DIRS:-.}"
+    build:
+      context: .
+      dockerfile: ./docker/Dockerfile
+      args:
+        BUNDLER_VERSION: '2.0.2'
+        RUBY_VERSION: '2.4.4'
+    image: crystalball
+    environment:
+      - EDITOR=micro
+      - HISTFILE=/crystalball/log/.bash_history
+    stdin_open: true
+    tty: true
+    volumes:
+      - .:/crystalball:cached
+      - bundle:/bundle
+
+volumes:
+  bundle:
diff --git a/docker/Dockerfile b/docker/Dockerfile
new file mode 100644
index 00000000..5d9e8b6e
--- /dev/null
+++ b/docker/Dockerfile
@@ -0,0 +1,35 @@
+ARG RUBY_VERSION
+FROM ruby:$RUBY_VERSION
+
+ARG BUNDLER_VERSION
+
+# Install micro editor
+RUN cd /usr/local/bin \
+  && curl -sL https://getmic.ro | bash
+
+# Install dependencies
+# RUN apt-get update -qq \
+#     && DEBIAN_FRONTEND=noninteractive apt-get -yq dist-upgrade \
+#     && DEBIAN_FRONTEND=noninteractive apt-get install -yq --no-install-recommends \
+#       build-essential \
+#     && apt-get clean \
+#     && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/* \
+#     && truncate -s 0 /var/log/*log
+
+# Configure bundler and PATH
+ENV LANG=C.UTF-8 \
+  GEM_HOME=/bundle \
+  BUNDLE_JOBS=4 \
+  BUNDLE_RETRY=3
+ENV BUNDLE_PATH $GEM_HOME
+ENV BUNDLE_APP_CONFIG=$BUNDLE_PATH \
+  BUNDLE_BIN=$BUNDLE_PATH/bin
+ENV PATH /crystalball/bin:$BUNDLE_BIN:$PATH
+
+# Upgrade RubyGems and install required Bundler version
+RUN gem update --system && \
+  gem install bundler:$BUNDLER_VERSION && \
+  git config --global user.email "john.doe@example.com" && \
+  git config --global user.name "John Doe"
+
+WORKDIR /crystalball