diff --git a/clapper_src/app.js b/clapper_src/app.js
new file mode 100644
index 00000000..ac758405
--- /dev/null
+++ b/clapper_src/app.js
@@ -0,0 +1,62 @@
+const { GLib, GObject, Gtk } = imports.gi;
+const { Player } = imports.clapper_src.player;
+const { Interface } = imports.clapper_src.interface;
+
+const APP_NAME = 'Clapper';
+
+var App = GObject.registerClass({
+    Signals: {
+        'player-ready': {
+            param_types: [GObject.TYPE_BOOLEAN]
+        }
+    }
+}, class ClapperApp extends Gtk.Application
+{
+    _init(args)
+    {
+        GLib.set_prgname(APP_NAME);
+
+        super._init();
+
+        this.connect('startup', () => this._buildUI());
+        this.connect('activate', () => this._openDialog());
+    }
+
+    run(arr)
+    {
+        arr = arr || [];
+        super.run(arr);
+    }
+
+    _buildUI()
+    {
+        this.appWindow = new Gtk.ApplicationWindow({
+            application: this,
+            title: APP_NAME,
+            border_width: 0,
+            resizable: true,
+            window_position: Gtk.WindowPosition.CENTER,
+            width_request: 960,
+            height_request: 642
+        });
+
+        this.interface = new Interface();
+
+        this.appWindow.add(this.interface);
+        this.appWindow.connect('realize', this._onRealize.bind(this));
+    }
+
+    _onRealize()
+    {
+        this.player = new Player();
+        this.interface.addPlayer(this.player);
+
+        this.player.widget.show_all();
+        this.emit('player-ready', true);
+    }
+
+    _openDialog()
+    {
+        this.appWindow.show_all();
+    }
+});
diff --git a/clapper_src/controls.js b/clapper_src/controls.js
new file mode 100644
index 00000000..3cb89b92
--- /dev/null
+++ b/clapper_src/controls.js
@@ -0,0 +1,92 @@
+const { GObject, Gtk } = imports.gi;
+
+var Controls = GObject.registerClass(
+class ClapperControls extends Gtk.HBox
+{
+    _init()
+    {
+        super._init({
+            margin_top: 4,
+            margin_bottom: 4
+        });
+
+        this.togglePlayButton = Gtk.Button.new_from_icon_name(
+            'media-playback-pause-symbolic',
+            Gtk.IconSize.LARGE_TOOLBAR
+        );
+        this.pauseButton = Gtk.Button.new_from_icon_name(
+            'media-playback-start-symbolic',
+            Gtk.IconSize.LARGE_TOOLBAR
+        );
+        this.playImage = this.pauseButton.image;
+        this.pauseImage = this.togglePlayButton.image;
+
+        this.positionScale = new Gtk.Scale({
+            orientation: Gtk.Orientation.HORIZONTAL,
+            value_pos: Gtk.PositionType.LEFT,
+            draw_value: false
+        });
+
+        this.volumeButton = new Gtk.ScaleButton({
+            size: Gtk.IconSize.SMALL_TOOLBAR
+        });
+        this._prepareVolumeButton();
+
+        this.pack_start(this.togglePlayButton, false, false, 4);
+        this.pack_start(this.positionScale, true, true, 0);
+        this.pack_start(this.volumeButton, false, false, 4);
+    }
+
+    _prepareVolumeButton()
+    {
+        this.volumeButtonAdjustment = this.volumeButton.get_adjustment();
+
+        this.volumeButtonAdjustment.set_upper(2);
+        this.volumeButtonAdjustment.set_step_increment(0.05);
+        this.volumeButtonAdjustment.set_page_increment(0.05);
+
+        let basicIcons = [
+            "audio-volume-low-symbolic",
+            "audio-volume-medium-symbolic",
+            "audio-volume-medium-symbolic",
+            "audio-volume-high-symbolic"
+        ];
+
+        let iconsArr = [
+            "audio-volume-muted-symbolic"
+        ];
+
+        for(let icon of basicIcons)
+            iconsArr = this._addManyToArr(icon, iconsArr, 5);
+
+        iconsArr = this._addManyToArr(
+             "audio-volume-overamplified-symbolic", iconsArr, 18
+        );
+
+        this.volumeButton.set_icons(iconsArr);
+
+        let popup = this.volumeButton.get_popup();
+        let box = popup.get_child();
+        let boxChildren = box.get_children();
+
+        for(let child of boxChildren) {
+            if(child.constructor === Gtk.Button)
+                box.remove(child);
+            if(child.constructor === Gtk.Scale) {
+                child.height_request = 200;
+                child.add_mark(0, Gtk.PositionType.LEFT, '0%');
+                child.add_mark(1, Gtk.PositionType.LEFT, '100%');
+                child.add_mark(2, Gtk.PositionType.LEFT, '200%');
+            }
+        }
+    }
+
+    _addManyToArr(item, arr, count)
+    {
+        for(let i = 0; i < count; i++) {
+            arr.push(item);
+        }
+
+        return arr;
+    }
+});
diff --git a/clapper_src/interface.js b/clapper_src/interface.js
new file mode 100644
index 00000000..17ed7633
--- /dev/null
+++ b/clapper_src/interface.js
@@ -0,0 +1,124 @@
+const { GObject, Gtk, GstPlayer } = imports.gi;
+const { Controls } = imports.clapper_src.controls;
+
+var Interface = GObject.registerClass(
+class ClapperInterface extends Gtk.Grid
+{
+    _init()
+    {
+        super._init();
+
+        this.lastPositionValue = 0;
+
+        this.controls = new Controls();
+        this.attach(this.controls, 0, 1, 1, 1);
+    }
+
+    addPlayer(player)
+    {
+        this._player = player;
+        this._player.widget.expand = true;
+        this._connectControlsToPlayer();
+
+        this.attach(this._player.widget, 0, 0, 1, 1);
+    }
+
+    _connectControlsToPlayer()
+    {
+        this._player.connect('state-changed', this._onPlayerStateChanged.bind(this));
+        this._player.connect('volume-changed', this._onPlayerVolumeChanged.bind(this));
+        this._player.connect('duration-changed', this._onPlayerDurationChanged.bind(this));
+        this._player.connect('position-updated', this._onPlayerPositionUpdated.bind(this));
+
+        this.controls.togglePlayButton.connect(
+            'clicked', this._onControlsTogglePlayClicked.bind(this)
+        );
+        this.controls.positionScale.connect(
+            'value-changed', this._onControlsPositionChanged.bind(this)
+        );
+        this.controls.volumeButton.connect(
+            'value-changed', this._onControlsVolumeChanged.bind(this)
+        );
+    }
+
+    _onPlayerStateChanged(player, state)
+    {
+        switch(state) {
+            case GstPlayer.PlayerState.STOPPED:
+                break;
+            case GstPlayer.PlayerState.BUFFERING:
+                break;
+            case GstPlayer.PlayerState.PAUSED:
+                this.controls.togglePlayButton.image = this.controls.playImage;
+                break;
+            case GstPlayer.PlayerState.PLAYING:
+                this.controls.togglePlayButton.image = this.controls.pauseImage;
+                break;
+            default:
+                break;
+        }
+    }
+
+    _onPlayerDurationChanged(player)
+    {
+        let duration = player.get_duration() / 1000000000;
+        let increment = (duration < 1)
+            ? 0
+            : (duration < 100)
+            ? 1
+            : duration / 100;
+
+        let adjustment = new Gtk.Adjustment({
+            upper: duration,
+            step_increment: increment,
+            page_increment: increment
+        });
+        this.controls.positionScale.set_adjustment(adjustment);
+    }
+
+    _onPlayerPositionUpdated(player, position)
+    {
+        let positionSeconds = position / 1000000000;
+        let positionFloor = Math.floor(positionSeconds);
+
+        if(positionFloor === this.lastPositionValue)
+            return;
+
+        this.lastPositionValue = positionFloor;
+        this.controls.positionScale.set_value(positionSeconds);
+    }
+
+    _onPlayerVolumeChanged(player)
+    {
+        let volume = player.get_volume();
+
+        if(this.controls.volumeButton.value === volume)
+            return;
+
+        this.controls.volumeButton.value = volume;
+    }
+
+    _onControlsTogglePlayClicked()
+    {
+        this._player.toggle_play();
+    }
+
+    _onControlsPositionChanged(range)
+    {
+        let position = Math.floor(range.get_value());
+
+        if(position === this.lastPositionValue)
+            return;
+
+        this.lastPositionValue = position;
+        this._player.seek_seconds(position);
+    }
+
+    _onControlsVolumeChanged(widget, value)
+    {
+        if(this._player.get_volume() === value)
+            return;
+
+        this._player.set_volume(value);
+    }
+});
diff --git a/src/player.js b/clapper_src/player.js
similarity index 69%
rename from src/player.js
rename to clapper_src/player.js
index 2716627f..f12240c6 100644
--- a/src/player.js
+++ b/clapper_src/player.js
@@ -1,10 +1,19 @@
 const { GLib, GObject, Gst, GstPlayer } = imports.gi;
 
-var GtkPlayer = GObject.registerClass(
-class GtkPlayer extends GstPlayer.Player
+const DEFAULTS = {
+    position_update_interval: 1000,
+    seek_accurate: false,
+    user_agent: 'clapper',
+};
+
+var Player = GObject.registerClass(
+class ClapperPlayer extends GstPlayer.Player
 {
-    _init()
+    _init(opts)
     {
+        opts = opts || {};
+        Object.assign(opts, DEFAULTS);
+
         let gtkglsink = Gst.ElementFactory.make('gtkglsink', null);
         let glsinkbin = Gst.ElementFactory.make('glsinkbin', null);
         glsinkbin.sink = gtkglsink;
@@ -19,6 +28,13 @@ class GtkPlayer extends GstPlayer.Player
             video_renderer: renderer
         });
 
+        let config = this.get_config();
+
+        for(let setting of Object.keys(DEFAULTS))
+            GstPlayer.Player[`config_set_${setting}`](config, opts[setting]);
+
+        this.set_config(config);
+
         this.loop = GLib.MainLoop.new(null, false);
         this.widget = gtkglsink.widget;
         this.state = GstPlayer.PlayerState.STOPPED;
@@ -33,6 +49,15 @@ class GtkPlayer extends GstPlayer.Player
         this.seek(position * 1000000000);
     }
 
+    toggle_play()
+    {
+        let action = (this.state === GstPlayer.PlayerState.PLAYING)
+            ? 'pause'
+            : 'play';
+
+        this[action]();
+    }
+
     _onStateChanged(player, state)
     {
         this.state = state;
diff --git a/gex.json b/gex.json
index 446bc128..c75d97ee 100644
--- a/gex.json
+++ b/gex.json
@@ -1,6 +1,9 @@
 {
   "name": "clapper",
   "files": [
-    "src/player.js"
+    "clapper_src/app.js",
+    "clapper_src/controls.js",
+    "clapper_src/interface.js",
+    "clapper_src/player.js"
   ]
 }
diff --git a/main.js b/main.js
new file mode 100644
index 00000000..b965730d
--- /dev/null
+++ b/main.js
@@ -0,0 +1,11 @@
+imports.gi.versions.Gtk = '3.0';
+
+const { Gst } = imports.gi;
+const { App } = imports.clapper_src.app;
+
+Gst.init(null);
+
+function main()
+{
+    let clapper = new App(arguments).run();
+}