diff --git a/Gemfile b/Gemfile
index 2d8ccf1..3729d07 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,15 +1,17 @@
+# frozen_string_literal: true
+
 source 'https://rubygems.org'
 
 # database, ORM, server
 gem 'activerecord'
+gem 'dotenv', groups: %i[development test]
+gem 'forme'
 gem 'json'
-gem 'rake'
-gem 'sinatra-activerecord'
+gem 'pry'
 gem 'puma'
 gem 'rackup'
-gem 'forme'
-gem 'pry'
-gem 'dotenv', groups: [:development, :test]
+gem 'rake'
+gem 'sinatra-activerecord'
 
 # browser automation
 gem 'ferrum', git: 'https://github.com/rubycdp/ferrum.git', ref: '7cc1a63351232b10f9ce191104efe6e9c72acca2'
@@ -18,15 +20,15 @@ gem 'puppeteer-ruby', '~> 0.45.6'
 # image processing
 gem 'mini_magick', '~> 4.12.0'
 
-#db
+# db
 gem 'sqlite3'
 
 group :development, :test do
+  gem 'database_cleaner-active_record'
   gem 'debug'
   gem 'nokogiri'
-  gem "rspec"
-  gem "rack-test"
-  gem "database_cleaner-active_record"
+  gem 'rack-test'
+  gem 'rspec'
 end
 
 group :test do
diff --git a/Rakefile b/Rakefile
index 96e3643..7fac84f 100644
--- a/Rakefile
+++ b/Rakefile
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require './app'
 require 'sinatra/activerecord/rake'
 
diff --git a/app.rb b/app.rb
index 79930f1..d6614dd 100644
--- a/app.rb
+++ b/app.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'dotenv/load'
 
 require 'sinatra'
@@ -17,12 +19,12 @@
 end
 
 helpers do
-  def create_forme(model, is_edit, attrs={}, options={})
+  def create_forme(model, _is_edit, attrs = {}, options = {})
     attrs[:method] = :post
     options = TailwindConfig.options.merge(options)
-    if model && model.persisted?
+    if model&.persisted?
       attrs[:action] += "/#{model.id}" if model.id
-      options[:before] = -> (form) {
+      options[:before] = lambda { |form|
         TailwindConfig.before.call(form)
         form.to_s << '<input name="_method" value="patch" type="hidden"/>'
       }
@@ -30,7 +32,7 @@ def create_forme(model, is_edit, attrs={}, options={})
     f = Forme::Form.new(model, options)
     f.extend(ExplicitFormePlugin)
     f.form_tag(attrs)
-    return f
+    f
   end
 end
 
@@ -45,8 +47,8 @@ def create_forme(model, is_edit, attrs={}, options={})
 # DEVICE MANAGEMENT
 def devices_form(device)
   create_forme(device, device.persisted?,
-        {autocomplete:"off", action: "/devices"},
-        {namespace: "device"})
+               { autocomplete: 'off', action: '/devices' },
+               { namespace: 'device' })
 end
 
 get '/devices/?' do
@@ -84,7 +86,7 @@ def devices_form(device)
 end
 
 get '/' do
-  erb :"index"
+  erb :index
 end
 
 # FIRMWARE SETUP
@@ -97,7 +99,7 @@ def devices_form(device)
     api_key = @device.api_key
     friendly_id = @device.friendly_id
     image_url = "#{ENV['BASE_URL']}/images/setup/setup-logo.bmp"
-    message = "Welcome to TRMNL BYOS"
+    message = 'Welcome to TRMNL BYOS'
 
     { status:, api_key:, friendly_id:, image_url:, message: }.to_json
   else
@@ -112,7 +114,7 @@ def devices_form(device)
 
   if @device
     base64 = (env['HTTP_BASE64'] || params[:base64]) == 'true'
-    screen = ScreenFetcher.call(base64: base64)
+    screen = ScreenFetcher.call(base64:)
 
     {
       status: 0, # on core TRMNL server, status 202 loops device back to /api/setup unless User is connected, which doesn't apply here
diff --git a/config/environments/test.rb b/config/environments/test.rb
index 17495d1..1fa5dcb 100644
--- a/config/environments/test.rb
+++ b/config/environments/test.rb
@@ -1 +1,3 @@
-config.active_record.maintain_test_schema = true
\ No newline at end of file
+# frozen_string_literal: true
+
+config.active_record.maintain_test_schema = true
diff --git a/config/initializers/explicit_forme_plugin.rb b/config/initializers/explicit_forme_plugin.rb
index 8634314..a543794 100644
--- a/config/initializers/explicit_forme_plugin.rb
+++ b/config/initializers/explicit_forme_plugin.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module ExplicitFormePlugin
   attr_reader :_form_tag
 
@@ -5,24 +7,24 @@ def form_tag(attrs)
     @_form_tag = ::Forme::Tag.new(self, :form, attrs)
   end
 
-  def explicit_open()
-    @to_s << self.serialize_open(@_form_tag)
-    self.before_form_yield
+  def explicit_open
+    @to_s << serialize_open(@_form_tag)
+    before_form_yield
     @to_s
   end
 
-  def explicit_close()
+  def explicit_close
     form_len = @to_s.length
-    self.after_form_yield
-    @to_s << self.serialize_close(@_form_tag)
+    after_form_yield
+    @to_s << serialize_close(@_form_tag)
     @to_s[form_len..]
   end
-  
+
   def form_output(&block)
     form_str = String.new
-    form_str << self.explicit_open()
+    form_str << explicit_open
     form_str << block.call if block_given?
-    form_str << self.explicit_close()
+    form_str << explicit_close
     form_str
   end
-end
\ No newline at end of file
+end
diff --git a/config/initializers/tailwind_form.rb b/config/initializers/tailwind_form.rb
index 3eb1147..e186634 100644
--- a/config/initializers/tailwind_form.rb
+++ b/config/initializers/tailwind_form.rb
@@ -1,21 +1,22 @@
+# frozen_string_literal: true
+
 require 'forme'
-require 'pp'
 
 module TailwindConfig
-  def self.label_attr 
-    { 
-      class: 'block text-gray-700 text-md leading-4 font-medium mb-2' 
+  def self.label_attr
+    {
+      class: 'block text-gray-700 text-md leading-4 font-medium mb-2'
     }
   end
 
-  def self.before 
-    -> (form) {
+  def self.before
+    lambda { |form|
       form.to_s << '<div class="rounded-xl bg-gray-50 shadow-sm border mb-6 divide-y divide-gray-200">'
     }
   end
 
-  def self.after 
-    -> (form) {
+  def self.after
+    lambda { |form|
       form.to_s << '</div>'
     }
   end
@@ -24,40 +25,40 @@ def self.options
     {
       labeler: :explicit,
       wrapper: :div,
-      before: self.before,
-      after: self.after,
+      before:,
+      after:,
       input_defaults: {
         text: {
-          label_attr: self.label_attr,
+          label_attr:,
           wrapper_attr: { class: 'p-6' },
-          class: 'block mt-2 min-h-12 px-4 rounded-xl text-black bg-white block w-full p-0 outline-none text-sm border border-gray-300 focus:outline-none ring-2 ring-transparent focus:ring-2 ring-offset-gray-200 focus:ring-offset-2 focus:ring-offset-gray-200 focus:ring-blue-500 focus:border-transparent transition duration-150' ,
+          class: 'block mt-2 min-h-12 px-4 rounded-xl text-black bg-white block w-full p-0 outline-none text-sm border border-gray-300 focus:outline-none ring-2 ring-transparent focus:ring-2 ring-offset-gray-200 focus:ring-offset-2 focus:ring-offset-gray-200 focus:ring-blue-500 focus:border-transparent transition duration-150'
         },
 
         number: {
-          label_attr: self.label_attr,
+          label_attr:,
           wrapper_attr: { class: 'p-6' },
-          class: 'block mt-2 min-h-12 px-4 rounded-xl text-black bg-white block w-full p-0 outline-none text-sm border border-gray-300 focus:outline-none ring-2 ring-transparent focus:ring-2 ring-offset-gray-200 focus:ring-offset-2 focus:ring-offset-gray-200 focus:ring-blue-500 focus:border-transparent transition duration-150' ,
+          class: 'block mt-2 min-h-12 px-4 rounded-xl text-black bg-white block w-full p-0 outline-none text-sm border border-gray-300 focus:outline-none ring-2 ring-transparent focus:ring-2 ring-offset-gray-200 focus:ring-offset-2 focus:ring-offset-gray-200 focus:ring-blue-500 focus:border-transparent transition duration-150'
         },
 
         time: {
-          label_attr: self.label_attr,
+          label_attr:,
           wrapper_attr: { class: 'p-6' },
-          class: 'block mt-2 min-h-12 px-4 rounded-xl text-black bg-white block w-full p-0 outline-none text-sm border border-gray-300 focus:outline-none ring-2 ring-transparent focus:ring-2 ring-offset-gray-200 focus:ring-offset-2 focus:ring-offset-gray-200 focus:ring-blue-500 focus:border-transparent transition duration-150' ,
+          class: 'block mt-2 min-h-12 px-4 rounded-xl text-black bg-white block w-full p-0 outline-none text-sm border border-gray-300 focus:outline-none ring-2 ring-transparent focus:ring-2 ring-offset-gray-200 focus:ring-offset-2 focus:ring-offset-gray-200 focus:ring-blue-500 focus:border-transparent transition duration-150'
         },
 
         checkbox: {
           label_position: :before,
-          label_attr: self.label_attr,
+          label_attr:,
           wrapper_attr: { class: 'p-6' },
-          class: 'h-8 w-8 rounded-full shadow',
+          class: 'h-8 w-8 rounded-full shadow'
         },
 
         submit: {
-          label_attr: self.label_attr,
+          label_attr:,
           attr: { class: 'cursor-pointer font-medium rounded-lg text-sm px-3 py-2 inline-flex items-center transition duration-150 justify-center shrink-0 gap-1.5 whitespace-nowrap text-white bg-blue-500 hover:bg-blue-600 focus:outline-none' },
-          wrapper_attr: { class: 'p-6 text-right' },
-        },
-      },
+          wrapper_attr: { class: 'p-6 text-right' }
+        }
+      }
     }
   end
 end
diff --git a/db/migrate/20241212172428_create_devices.rb b/db/migrate/20241212172428_create_devices.rb
index 8d4833e..4f0ee50 100644
--- a/db/migrate/20241212172428_create_devices.rb
+++ b/db/migrate/20241212172428_create_devices.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class CreateDevices < ActiveRecord::Migration[8.0]
   def change
     create_table :devices do |t|
diff --git a/db/schema.rb b/db/schema.rb
index acc204a..b3c60d5 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # This file is auto-generated from the current state of the database. Instead
 # of editing this file, please use the migrations feature of Active Record to
 # incrementally modify your database, and then regenerate this schema definition.
@@ -10,14 +12,14 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema[8.0].define(version: 2024_12_12_172428) do
-  create_table "devices", force: :cascade do |t|
-    t.string "name"
-    t.string "mac_address"
-    t.string "api_key"
-    t.string "friendly_id"
-    t.integer "refresh_interval", default: 900, null: false
-    t.datetime "created_at", null: false
-    t.datetime "updated_at", null: false
+ActiveRecord::Schema[8.0].define(version: 20_241_212_172_428) do
+  create_table 'devices', force: :cascade do |t|
+    t.string 'name'
+    t.string 'mac_address'
+    t.string 'api_key'
+    t.string 'friendly_id'
+    t.integer 'refresh_interval', default: 900, null: false
+    t.datetime 'created_at', null: false
+    t.datetime 'updated_at', null: false
   end
 end
diff --git a/models/device.rb b/models/device.rb
index 5fbdf2f..912a410 100644
--- a/models/device.rb
+++ b/models/device.rb
@@ -1,6 +1,7 @@
-class Device < ActiveRecord::Base
+# frozen_string_literal: true
 
-  DEFAULT_DEVICE_NAME = 'My TRMNL'.freeze
+class Device < ActiveRecord::Base
+  DEFAULT_DEVICE_NAME = 'My TRMNL'
   MODEL = [
     {
       name: 'og',
@@ -21,4 +22,4 @@ def generate_friendly_id
   def generate_api_key
     self.api_key = SecureRandom.urlsafe_base64(nil, false)
   end
-end
\ No newline at end of file
+end
diff --git a/services/screen_fetcher.rb b/services/screen_fetcher.rb
index 9192112..065a287 100644
--- a/services/screen_fetcher.rb
+++ b/services/screen_fetcher.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class ScreenFetcher
   class << self
     attr_reader :base64
@@ -16,7 +18,7 @@ def last_generated_image
 
       image_url = if base64
                     img = File.open("public/#{relative_img_path}")
-                    'data:image/png;base64,' + Base64.strict_encode64(img.read)
+                    "data:image/png;base64,#{Base64.strict_encode64(img.read)}"
                   else
                     "#{base_domain}/#{relative_img_path}"
                   end
diff --git a/services/screen_generator.rb b/services/screen_generator.rb
index 5802965..d0e9c01 100644
--- a/services/screen_generator.rb
+++ b/services/screen_generator.rb
@@ -1,10 +1,11 @@
+# frozen_string_literal: true
+
 require 'ferrum'
 require 'mini_magick'
 require 'puppeteer-ruby'
 require 'base64'
 
 class ScreenGenerator
-
   def initialize(html, image = false)
     self.input = html
     self.image = image
@@ -31,11 +32,11 @@ def convert_to_image
     begin
       # context = browser_instance.create_incognito_browser_context
       page = firefox_browser.new_page
-      page.viewport = Puppeteer::Viewport.new(width: width, height: height)
+      page.viewport = Puppeteer::Viewport.new(width:, height:)
       # NOTE: Use below for chromium
       # page.set_content(input, wait_until: ['networkidle0', 'domcontentloaded'])
       # Note: Use below for firefox
-      page.set_content(input, timeout: 10000)
+      page.set_content(input, timeout: 10_000)
       page.evaluate(<<~JAVASCRIPT)
         () => {
           document.getElementsByTagName('html')[0].style.overflow = "hidden";
@@ -61,12 +62,12 @@ def convert_to_image
   # This will increase the throughput of our image rendering process by 60-70%, saving about ~1.5 second per image generation.
   # On local it takes < 1 second now to generate the subsequent image.
   def firefox_browser
-    @browser ||= Puppeteer.launch(
+    @firefox_browser ||= Puppeteer.launch(
       product: 'firefox',
       headless: true,
       args: [
         "--window-size=#{width},#{height}",
-        "--disable-web-security"
+        '--disable-web-security'
         # "--hide-scrollbars" #works only on chrome, using page.evaluate for firefox
       ]
     )
diff --git a/spec/app_spec.rb b/spec/app_spec.rb
index d90b43b..21b226a 100644
--- a/spec/app_spec.rb
+++ b/spec/app_spec.rb
@@ -1,10 +1,12 @@
+# frozen_string_literal: true
+
 require_relative 'spec_helper'
 
 RSpec.describe 'App base path tests' do
   it 'test_it_has_root_path' do
     browser = get '/'
     expect(browser.status).to be(200)
-    expect(browser.body).to match("To set up your device")
+    expect(browser.body).to match('To set up your device')
   end
 
   it 'test_it_has_device_list_path' do
@@ -22,14 +24,14 @@
   it 'test_it_has_api_setup_path_with_a_device' do
     mac = 'aa:bb:cc:00:00:01'
     dev = Device.create!({
-      name: "Test Trmnl", mac_address: mac
-    }) 
-    header("ID", mac)
+                           name: 'Test Trmnl', mac_address: mac
+                         })
+    header('ID', mac)
     _, body = get_json '/api/setup/'
     expect(body['api_key']).to eq(dev.api_key)
     expect(body['friendly_id']).to eq(dev.friendly_id)
-    expect(body['image_url']).to eq(ENV['BASE_URL'] + '/images/setup/setup-logo.bmp')
-    expect(body['message']).to eq("Welcome to TRMNL BYOS")
+    expect(body['image_url']).to eq("#{ENV['BASE_URL']}/images/setup/setup-logo.bmp")
+    expect(body['message']).to eq('Welcome to TRMNL BYOS')
   end
 end
 
@@ -42,13 +44,13 @@
   it 'test_it_has_api_setup_path_with_a_device' do
     mac = 'aa:bb:cc:00:00:01'
     dev = Device.create!({
-      name: "Test Trmnl", mac_address: mac
-    }) 
-    header("ID", mac)
+                           name: 'Test Trmnl', mac_address: mac
+                         })
+    header('ID', mac)
     _, body = get_json '/api/setup/'
     expect(body['api_key']).to eq(dev.api_key)
     expect(body['friendly_id']).to eq(dev.friendly_id)
-    expect(body['image_url']).to eq(ENV['BASE_URL'] + '/images/setup/setup-logo.bmp')
-    expect(body['message']).to eq("Welcome to TRMNL BYOS")
+    expect(body['image_url']).to eq("#{ENV['BASE_URL']}/images/setup/setup-logo.bmp")
+    expect(body['message']).to eq('Welcome to TRMNL BYOS')
   end
-end
\ No newline at end of file
+end
diff --git a/spec/display_spec.rb b/spec/display_spec.rb
index a0a55d6..257d453 100644
--- a/spec/display_spec.rb
+++ b/spec/display_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative 'spec_helper'
 
 RSpec.describe 'Display path tests' do
diff --git a/spec/setup_spec.rb b/spec/setup_spec.rb
index d45df3b..59a3ff9 100644
--- a/spec/setup_spec.rb
+++ b/spec/setup_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative 'spec_helper'
 
 RSpec.describe 'API setup path tests' do
@@ -9,13 +11,13 @@
   it 'test_it_has_api_setup_path_with_a_device' do
     mac = 'aa:bb:cc:00:00:01'
     dev = Device.create!({
-      name: "Test Trmnl", mac_address: mac
-    }) 
-    header("ID", mac)
+                           name: 'Test Trmnl', mac_address: mac
+                         })
+    header('ID', mac)
     _, body = get_json '/api/setup/'
     expect(body['api_key']).to eq(dev.api_key)
     expect(body['friendly_id']).to eq(dev.friendly_id)
-    expect(body['image_url']).to eq(ENV['BASE_URL'] + '/images/setup/setup-logo.bmp')
-    expect(body['message']).to eq("Welcome to TRMNL BYOS")
+    expect(body['image_url']).to eq("#{ENV['BASE_URL']}/images/setup/setup-logo.bmp")
+    expect(body['message']).to eq('Welcome to TRMNL BYOS')
   end
-end
\ No newline at end of file
+end
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index 75e7247..ddece62 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 ENV['APP_ENV'] = 'test'
 ENV['RACK_ENV'] = 'test'
 
@@ -5,8 +7,7 @@
 require 'rack/test'
 require 'nokogiri'
 require 'database_cleaner/active_record'
-require_relative "../app"
-
+require_relative '../app'
 
 # See https://rubydoc.info/gems/rspec-core/RSpec/Core/Configuration
 RSpec.configure do |config|
@@ -14,7 +15,7 @@
 
   ActiveRecord::Base.establish_connection(:test)
   ActiveRecord::Schema.verbose = false
-  load "db/schema.rb"
+  load 'db/schema.rb'
 
   config.expect_with :rspec do |expectations|
     expectations.include_chain_clauses_in_custom_matcher_descriptions = true
@@ -27,7 +28,7 @@
   config.shared_context_metadata_behavior = :apply_to_host_groups
 
   DatabaseCleaner.strategy = :truncation
-  config.after do 
+  config.after do
     DatabaseCleaner.clean
   end
 
@@ -35,23 +36,23 @@ def app
     Sinatra::Application
   end
 
-  def get_and_parse(page, query_params={}, env={})
+  def get_and_parse(page, query_params = {}, env = {})
     get(page, query_params, env)
     @doc = Nokogiri::HTML(last_response.body)
-    return @doc
+    @doc
   end
 
-  def get_json(page, query_params={}, env={})
+  def get_json(page, query_params = {}, env = {})
     get(page, query_params, env)
     @doc = last_response
-    expect(@doc.headers['content-type']).to eq("application/json")
-    return [@doc, JSON.parse(@doc.body)]
+    expect(@doc.headers['content-type']).to eq('application/json')
+    [@doc, JSON.parse(@doc.body)]
   end
 
-  def post_json(page, data, params={}, env={})
+  def post_json(page, data, params = {}, env = {})
     post(page, JSON.generate(data), params, env)
     @doc = last_response
-    expect(@doc.headers['content-type']).to eq("application/json")
-    return [@doc, JSON.parse(@doc.body)]
+    expect(@doc.headers['content-type']).to eq('application/json')
+    [@doc, JSON.parse(@doc.body)]
   end
 end