diff --git a/app/Main.hs b/app/Main.hs
index 1de115b..88622bc 100644
--- a/app/Main.hs
+++ b/app/Main.hs
@@ -1,11 +1,65 @@
+{-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE TemplateHaskell #-}
+
 module Main (main) where
 
+import Control.Lens
+
+import Monomer
+import TextShow
+
 import Lib
 
+newtype AppModel = AppModel {
+    _clickCount :: Int
+} deriving (Eq, Show)
+
+data AppEvent = AppInit | AppIncrease deriving (Show, Eq)
+
+makeLenses 'AppModel
+
+buildUI
+  :: WidgetEnv AppModel AppEvent
+  -> AppModel
+  -> WidgetNode AppModel AppEvent
+buildUI wenv model = widgetTree where
+  widgetTree = vstack [
+      label "Hello world",
+      spacer,
+      hstack [
+        label $ "Click count: " <> showt (model ^. clickCount),
+        spacer,
+        button "Increase count" AppIncrease
+      ]
+    ] `styleBasic` [padding 10]
+
+handleEvent
+  :: WidgetEnv AppModel AppEvent
+  -> WidgetNode AppModel AppEvent
+  -> AppModel
+  -> AppEvent
+  -> [AppEventResponse AppModel AppEvent]
+handleEvent wenv node model evt = case evt of
+  AppInit -> []
+  AppIncrease -> [Model (model & clickCount +~ 1)]
+
+
 main :: IO ()
 main = do
     putStrLn "haskell-clock"
     t <- curTimeString
     putStrLn t
+    guiMain
 
-
+guiMain :: IO ()
+guiMain = do
+  startApp model handleEvent buildUI config
+  where
+    config = [
+      appWindowTitle "Haskell Clock",
+      --appWindowIcon "./assets/images/icon.png",
+      appTheme darkTheme,
+      appFontDef "Regular" "/usr/share/fonts/TTF/FiraCode-Regular.ttf",
+      appInitEvent AppInit
+      ]
+    model = AppModel 0
diff --git a/haskell-clock.cabal b/haskell-clock.cabal
index 168f353..9788b77 100644
--- a/haskell-clock.cabal
+++ b/haskell-clock.cabal
@@ -33,6 +33,9 @@ library
   ghc-options: -Wall -Wcompat -Widentities -Wincomplete-record-updates -Wincomplete-uni-patterns -Wmissing-export-lists -Wmissing-home-modules -Wpartial-fields -Wredundant-constraints
   build-depends:
       base >=4.7 && <5
+    , lens
+    , monomer
+    , text-show
     , time
   default-language: Haskell2010
 
@@ -46,6 +49,9 @@ executable haskell-clock-exe
   build-depends:
       base >=4.7 && <5
     , haskell-clock
+    , lens
+    , monomer
+    , text-show
     , time
   default-language: Haskell2010
 
@@ -60,5 +66,8 @@ test-suite haskell-clock-test
   build-depends:
       base >=4.7 && <5
     , haskell-clock
+    , lens
+    , monomer
+    , text-show
     , time
   default-language: Haskell2010
diff --git a/package.yaml b/package.yaml
index 7b5c2b8..2f28223 100644
--- a/package.yaml
+++ b/package.yaml
@@ -22,6 +22,9 @@ description:         Please see the README on GitHub at <https://github.com/gith
 dependencies:
 - base >= 4.7 && < 5
 - time
+- monomer
+- lens
+- text-show
 
 ghc-options:
 - -Wall