diff --git a/abacus.cabal b/abacus.cabal
index 7d38211..3559688 100644
--- a/abacus.cabal
+++ b/abacus.cabal
@@ -20,6 +20,8 @@ extra-source-files:
 library
   exposed-modules:
       Abacus
+      Abacus.App
+      Abacus.App.Types
       Abacus.Internal
   other-modules:
       Paths_abacus
@@ -30,6 +32,7 @@ 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
+    , brick >=2.1.1 && <2.2
     , microlens-platform >=0.4.3.5 && <0.5
   default-language: Haskell2010
 
@@ -45,6 +48,7 @@ executable abacus
   build-depends:
       abacus
     , base >=4.7 && <5
+    , brick >=2.1.1 && <2.2
     , microlens-platform >=0.4.3.5 && <0.5
   default-language: Haskell2010
 
@@ -62,6 +66,7 @@ test-suite abacus-test
   build-depends:
       abacus
     , base >=4.7 && <5
+    , brick >=2.1.1 && <2.2
     , hspec >=2.11.9 && <2.12
     , microlens-platform >=0.4.3.5 && <0.5
   default-language: Haskell2010
diff --git a/app/Main.hs b/app/Main.hs
index a9b6b08..faa4273 100644
--- a/app/Main.hs
+++ b/app/Main.hs
@@ -21,7 +21,13 @@ License along with this program.  If not, see
 
 module Main (main) where
 
+import Brick (defaultMain)
+import Control.Monad (void)
+
+import Abacus.App
+import Abacus.App.Types
+
 main :: IO ()
-main = return ()
+main = void $ defaultMain mainApp initialState
 
 --jl
diff --git a/package.yaml b/package.yaml
index bc226e0..cc8ae38 100644
--- a/package.yaml
+++ b/package.yaml
@@ -20,6 +20,7 @@ description:         Please see README.md
 
 dependencies:
 - base >= 4.7 && < 5
+- brick >= 2.1.1 && < 2.2
 - microlens-platform >= 0.4.3.5 && < 0.5
 
 ghc-options:
diff --git a/src/Abacus/App.hs b/src/Abacus/App.hs
new file mode 100644
index 0000000..cda3f48
--- /dev/null
+++ b/src/Abacus/App.hs
@@ -0,0 +1,59 @@
+{-|
+
+Module      : Abacus.App
+Description : Applicaiton framework
+Copyright   : (C) Jonathan Lamothe
+License     : AGPL-3.0-or-later
+Maintainer  : jonathan@jlamothe.net
+Stability   : experimental
+Portability : POSIX
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU Affero General Public License as
+published by the Free Software Foundation, either version 3 of the
+License, or (at your option) any later version.
+
+This program is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+Affero General Public License for more details.
+
+You should have received a copy of the GNU Affero General Public
+License along with this program.  If not, see
+<https://www.gnu.org/licenses/>.
+
+-}
+
+module Abacus.App (mainApp) where
+
+import Brick
+  ( App (..)
+  , BrickEvent
+  , EventM
+  , Widget
+  , attrMap
+  , emptyWidget
+  , halt
+  , neverShowCursor
+  , style
+  )
+
+import Abacus.App.Types
+
+-- | Main application
+mainApp :: App AppState () ()
+mainApp = App
+  { appDraw         = drawFunc
+  , appChooseCursor = neverShowCursor
+  , appHandleEvent  = eventHandler
+  , appStartEvent   = return ()
+  , appAttrMap      = const $ attrMap (style 0) []
+  }
+
+drawFunc :: AppState -> [Widget ()]
+drawFunc = const [emptyWidget]
+
+eventHandler :: BrickEvent () () -> EventM () AppState ()
+eventHandler = const halt
+
+--jl
diff --git a/src/Abacus/App/Types.hs b/src/Abacus/App/Types.hs
new file mode 100644
index 0000000..52c0dfd
--- /dev/null
+++ b/src/Abacus/App/Types.hs
@@ -0,0 +1,60 @@
+{-|
+
+Module      : Abacus.App.Types
+Description : Applicaiton types for applicaiton UI
+Copyright   : (C) Jonathan Lamothe
+License     : AGPL-3.0-or-later
+Maintainer  : jonathan@jlamothe.net
+Stability   : experimental
+Portability : POSIX
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU Affero General Public License as
+published by the Free Software Foundation, either version 3 of the
+License, or (at your option) any later version.
+
+This program is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+Affero General Public License for more details.
+
+You should have received a copy of the GNU Affero General Public
+License along with this program.  If not, see
+<https://www.gnu.org/licenses/>.
+
+-}
+
+{-# LANGUAGE TemplateHaskell #-}
+
+module Abacus.App.Types (
+  AppState (..),
+  -- * Lenses
+  abacus,
+  rungNum,
+  -- * Constructor
+  initialState,
+  ) where
+
+import Data.Maybe (fromJust)
+import Lens.Micro.Platform (makeLenses)
+
+import Abacus
+
+-- | Main applicaiton state
+data AppState = AppState
+  { _abacus :: Abacus
+  -- ^ The abacus data
+  , _rungNum :: Int
+  -- ^ The selected rung number
+  } deriving (Eq, Show)
+
+makeLenses ''AppState
+
+-- | Initial application state
+initialState :: AppState
+initialState = AppState
+  { _abacus  = fromJust $ newAbacus 10 10
+  , _rungNum = 0
+  }
+
+--jl