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diff --git a/src/Chelleport/AppState.hs b/src/Chelleport/AppState.hs
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+module Chelleport.AppState (initialState, update) where
+
+import Chelleport.AppShell (MonadAppShell (hideWindow, showWindow, shutdownApp))
+import Chelleport.Control (MonadControl (..), directionalIncrement)
+import Chelleport.Draw (MonadDraw (windowPosition, windowSize), pointerPositionIncrement, screenPositionFromCellPosition, wordPosition)
+import Chelleport.KeySequence (findMatchPosition, generateGrid, nextChars, toKeyChar)
+import Chelleport.OCR (MonadOCR (captureScreenshot), getWordsInImage)
+import Chelleport.Types
+import Chelleport.Utils (cIntToInt, clamp, intToCInt, isEmpty, itemAt)
+import Control.Monad (forM_)
+import Data.Char (toLower)
+import Data.List (isInfixOf)
+import Data.Maybe (fromMaybe, isJust)
+
+initialState :: (Monad m) => m (State, Maybe AppAction)
+initialState = do
+  let cells = fromMaybe (pure undefined) $ generateGrid 0 (rows, columns) hintKeys
+  pure (defaultAppState {stateGrid = cells}, Just $ SetMode defaultHintsMode)
+  where
+    rows = 9
+    columns = 16
+    hintKeys = ['A' .. 'Z']
+
+update :: (MonadAppShell m, MonadDraw m, MonadControl m, MonadOCR m) => State -> AppAction -> m (State, Maybe AppAction)
+-- Chain clicks
+update state (ChainMouseClick btn) = do
+  hideWindow
+  let count = case stateRepetition state of 0 -> 1; n -> n
+  forM_ [1 .. count] $ \_ -> do
+    clickMouseButton btn
+  showWindow
+  pure (state {stateRepetition = 1}, Just ResetKeys)
+
+-- HINTS MODE: Act on key inputs
+update state@(State {stateMode = ModeHints}) (HandleKeyInput keycode) = do
+  case (toKeyChar keycode, validNextKeys) of
+    (Just keyChar, Just validChars')
+      | stateIsMatched state && keyChar `elem` ("HJKL" :: String) -> do
+          incr <- pointerPositionIncrement state
+          let action = IncrementMouseCursor $ directionalIncrement incr keyChar
+          pure (state, Just action)
+      | keyChar `elem` validChars' -> do
+          let newKeySequence = stateKeySequence state ++ [keyChar]
+          let matchPosition = findMatchPosition newKeySequence $ stateGrid state
+          let state' = state {stateKeySequence = newKeySequence, stateIsMatched = isJust matchPosition}
+          action <- traverse (fmap MoveMousePosition . screenPositionFromCellPosition state) matchPosition
+          pure (state', action)
+    _ -> pure (state, Nothing)
+  where
+    validNextKeys = nextChars (stateKeySequence state) (stateGrid state)
+
+-- SEARCH MODE: Act on key inputs
+update state@(State {stateMode = ModeSearch {searchWords, searchInputText}}) (HandleKeyInput keycode) = do
+  case toKeyChar keycode of
+    Just keyChar -> do
+      let searchText = searchInputText ++ [toLower keyChar]
+      let matches = filterMatches searchText
+      let highlightedIndex = clamp (0, length matches - 1) (searchHighlightedIndex mode)
+      let updatedMode =
+            mode
+              { searchInputText = searchText,
+                searchFilteredWords = matches,
+                searchHighlightedIndex = highlightedIndex
+              }
+      let highlightedWord = matches `itemAt` highlightedIndex
+      action <- traverse (fmap MoveMousePosition . wordPosition) highlightedWord
+      pure (state {stateMode = updatedMode}, action)
+    _ -> do
+      pure (state, Nothing)
+  where
+    mode = stateMode state
+    filterMatches text
+      | isEmpty text = searchWords
+      | otherwise = filter (isInfixOf text . map toLower . matchText) searchWords
+
+-- Increment highlighted index for search mode
+update state (IncrementHighlightIndex n) = do
+  case stateMode state of
+    ModeSearch {} -> do
+      action <- traverse (fmap MoveMousePosition . wordPosition) highlightedWord
+      pure (state {stateRepetition = 1, stateMode = mode {searchHighlightedIndex = highlightedIndexClamped}}, action)
+      where
+        highlightedWord = searchFilteredWords mode `itemAt` highlightedIndex
+        highlightedIndex = searchHighlightedIndex mode + n
+        highlightedIndexClamped =
+          if highlightedIndex < 0
+            then length (searchFilteredWords mode) - 1
+            else highlightedIndex `mod` length (searchFilteredWords mode)
+        mode = stateMode state
+    _ -> pure (state, Nothing)
+
+-- Move mouse incrementally
+update state (IncrementMouseCursor (incX, incY)) = do
+  (curX, curY) <- getMousePointerPosition
+  let count = case stateRepetition state of 0 -> 1; n -> n
+  let pos = (cIntToInt curX + count * incX, cIntToInt curY + count * incY)
+  pure (state {stateRepetition = 1}, Just $ MoveMousePosition pos)
+
+-- Mouse button release
+update state MouseDragEnd = do
+  hideWindow
+  releaseMouseButton
+  showWindow
+  pure (state {stateRepetition = 1}, Nothing)
+
+-- Mouse button press
+update state MouseDragStart = do
+  hideWindow
+  pressMouseButton
+  showWindow
+  pure (state {stateRepetition = 1}, Nothing)
+
+-- Mouse dragging
+update state MouseDragToggle
+  | stateIsDragging state = pure (state {stateIsDragging = False}, Just MouseDragEnd)
+  | otherwise = do pure (state {stateIsDragging = True}, Just MouseDragStart)
+
+-- Move mouse to given position
+update state (MoveMousePosition (x, y)) = do
+  moveMousePointer (intToCInt x) (intToCInt y)
+  pure (state, Nothing)
+
+-- Reset entered key sequence and state
+update state ResetKeys = do
+  pure
+    ( state
+        { stateKeySequence = [],
+          stateIsMatched = False,
+          stateRepetition = 1,
+          stateMode = resetMode (stateMode state)
+        },
+      Nothing
+    )
+  where
+    resetMode mode@ModeHints = mode
+    resetMode (ModeSearch {searchWords}) =
+      defaultSearchMode {searchWords = searchWords, searchFilteredWords = searchWords}
+
+-- Set mode
+update state (SetMode mode) = do
+  case mode of
+    ModeHints -> pure (state {stateMode = mode}, Nothing)
+    ModeSearch {} -> do
+      position <- windowPosition
+      size <- windowSize
+      screenshot <- hideWindow >> captureScreenshot position size <* showWindow
+      matches <- getWordsInImage screenshot
+      let updatedMode = mode {searchWords = matches, searchFilteredWords = matches}
+      pure (state {stateMode = updatedMode}, Nothing)
+
+-- Cleanup everything and exit
+update state ShutdownApp = do
+  shutdownApp
+  pure (state, Nothing)
+
+-- Trigger click
+update state (TriggerMouseClick btn) = do
+  hideWindow
+  let count = case stateRepetition state of 0 -> 1; n -> n
+  forM_ [1 .. count] $ \_ -> do
+    clickMouseButton btn
+  pure (state {stateRepetition = 1}, Just ShutdownApp)
+
+-- Set repetition count
+update state (UpdateRepetition count) = do
+  pure (state {stateRepetition = count}, Nothing)
+
+-- Set/unset whether shift is pressed
+update state (UpdateShiftState shiftPressed) =
+  pure (state {stateIsShiftPressed = shiftPressed}, Nothing)