diff --git a/index.tsx b/index.tsx
index fbc02cf..ccb4f28 100644
--- a/index.tsx
+++ b/index.tsx
@@ -7,19 +7,37 @@ import {importFromStackprof} from './import/stackprof'
 import {Profile} from './profile'
 import {Flamechart, FlamechartView} from './flamechart'
 
+const enum SortOrder {
+  CHRONO,
+  ALPHA
+}
+
 interface ApplicationState {
   profile: Profile | null
   flamechart: Flamechart | null
+  sortedFlamechart: Flamechart | null
+  sortOrder: SortOrder
 }
 
 class Application extends Component<{}, ApplicationState> {
+  constructor() {
+    super()
+    this.state = {
+      profile: null,
+      flamechart: null,
+      sortedFlamechart: null,
+      sortOrder: SortOrder.CHRONO
+    }
+  }
+
   onDrop = (ev: DragEvent) => {
     const file = ev.dataTransfer.files.item(0)
     const reader = new FileReader
     reader.addEventListener('loadend', () => {
       const profile = file.name.endsWith('json') ? importFromStackprof(reader.result) : importFromBGFlameGraph(reader.result)
       const flamechart = new Flamechart(profile)
-      this.setState({profile, flamechart})
+      const sortedFlamechart = new Flamechart(profile.sortedAlphabetically())
+      this.setState({profile, flamechart, sortedFlamechart})
     })
     reader.readAsText(file)
     ev.preventDefault()
@@ -29,17 +47,37 @@ class Application extends Component<{}, ApplicationState> {
     ev.preventDefault()
   }
 
+  onWindowKeyPress = (ev: KeyboardEvent) => {
+    if (ev.key == 'a') {
+      this.setState({
+        sortOrder: this.state.sortOrder === SortOrder.CHRONO ? SortOrder.ALPHA : SortOrder.CHRONO
+      })
+    }
+  }
+
+  onWindowResize = () => {
+    this.forceUpdate()
+  }
+
   componentDidMount() {
-    window.addEventListener('resize', () => {
-      this.forceUpdate()
-    })
+    window.addEventListener('resize', this.onWindowResize)
+    // TODO(jlfwong): for this to be safely embeddable, there'll need to be some
+    // way of specify event focus.
+    window.addEventListener('keypress', this.onWindowKeyPress)
+  }
+
+  componentWillUnmount() {
+    window.removeEventListener('resize', this.onWindowResize)
+    window.removeEventListener('keypress', this.onWindowKeyPress)
   }
 
   render() {
-    const {flamechart} = this.state
+    const {flamechart, sortedFlamechart, sortOrder} = this.state
+    const flamechartToView = sortOrder == SortOrder.CHRONO ? flamechart : sortedFlamechart
+
     return <div onDrop={this.onDrop} onDragOver={this.onDragOver} className={css(style.root)}>
-      {flamechart &&
-        <FlamechartView flamechart={flamechart} />}
+      {flamechartToView &&
+        <FlamechartView flamechart={flamechartToView} />}
     </div>
   }
 }
diff --git a/profile.ts b/profile.ts
index b51f3b4..94659a6 100644
--- a/profile.ts
+++ b/profile.ts
@@ -170,4 +170,37 @@ export class Profile {
       this.timeDeltas.push(timeDelta)
     }
   }
+
+  sortedAlphabetically(): Profile {
+    function key(sample: CallTreeNode) {
+      let k = ''
+      let node: CallTreeNode | null = sample
+      while (node) {
+        k = node.frame.name + ':' + k
+        node = node.parent
+      }
+      return k
+    }
+
+    let sortedSamples: [CallTreeNode, number][] = []
+    for (let i = 0; i < this.samples.length; i++) {
+      sortedSamples.push([this.samples[i], this.timeDeltas[i]])
+    }
+
+    sortedSamples.sort((a, b) => key(a[0]) < key(b[0]) ? -1 : 1)
+
+    const sortedProfile = new Profile(this.duration)
+    for (const [stackTop, timeDelta] of sortedSamples) {
+      const stack: FrameInfo[] = []
+      function visit(node: CallTreeNode) {
+        if (node.parent) visit(node.parent)
+        const frameInfo = {...node.frame}
+        frameInfo.key = frameInfo.name
+        stack.push(frameInfo)
+      }
+      visit(stackTop)
+      sortedProfile.appendSample(stack, timeDelta)
+    }
+    return sortedProfile
+  }
 }
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