diff --git a/lib/src/sparkline.dart b/lib/src/sparkline.dart
index 30b497b..08fe43b 100644
--- a/lib/src/sparkline.dart
+++ b/lib/src/sparkline.dart
@@ -68,12 +68,6 @@ class Sparkline extends StatelessWidget {
     this.fillGradient,
     this.fallbackHeight = 100.0,
     this.fallbackWidth = 300.0,
-    this.enableGridLines = false,
-    this.gridLineColor = Colors.grey,
-    this.gridLineAmount = 5,
-    this.gridLineWidth = 0.5,
-    this.gridLineLabelColor = Colors.grey,
-    this.labelPrefix = "\$",
   })  : assert(data != null),
         assert(lineWidth != null),
         assert(lineColor != null),
@@ -166,22 +160,6 @@ class Sparkline extends StatelessWidget {
   ///  * [fallbackWidth], the same but horizontally.
   final double fallbackHeight;
 
-  /// Enable or disable grid lines
-  final bool enableGridLines;
-
-  /// Color of grid lines and label text
-  final Color gridLineColor;
-  final Color gridLineLabelColor;
-
-  /// Number of grid lines
-  final int gridLineAmount;
-
-  /// Width of grid lines
-  final double gridLineWidth;
-
-  /// Symbol prefix for grid line labels
-  final String labelPrefix;
-
   @override
   Widget build(BuildContext context) {
     return new LimitedBox(
@@ -201,12 +179,6 @@ class Sparkline extends StatelessWidget {
           pointsMode: pointsMode,
           pointSize: pointSize,
           pointColor: pointColor,
-          enableGridLines: enableGridLines,
-          gridLineColor: gridLineColor,
-          gridLineAmount: gridLineAmount,
-          gridLineLabelColor: gridLineLabelColor,
-          gridLineWidth: gridLineWidth,
-          labelPrefix: labelPrefix
         ),
       ),
     );
@@ -226,14 +198,8 @@ class _SparklinePainter extends CustomPainter {
     @required this.pointsMode,
     @required this.pointSize,
     @required this.pointColor,
-    @required this.enableGridLines,
-    this.gridLineColor,
-    this.gridLineAmount,
-    this.gridLineWidth,
-    this.gridLineLabelColor,
-    this.labelPrefix
-    })  : _max = dataPoints.reduce(math.max),
-      _min = dataPoints.reduce(math.min);
+  })  : _max = dataPoints.reduce(math.max),
+        _min = dataPoints.reduce(math.min);
 
   final List<double> dataPoints;
 
@@ -254,48 +220,11 @@ class _SparklinePainter extends CustomPainter {
   final double _max;
   final double _min;
 
-  final bool enableGridLines;
-  final Color gridLineColor;
-  final int gridLineAmount;
-  final double gridLineWidth;
-  final Color gridLineLabelColor;
-  final String labelPrefix;
-
-  List<TextPainter> gridLineTextPainters = [];
-
-  update() {
-    if (enableGridLines) {
-      double gridLineValue;
-      for (int i = 0; i < gridLineAmount; i++) {
-        // Label grid lines
-        gridLineValue = _max - (((_max - _min) / (gridLineAmount - 1)) * i);
-
-        String gridLineText;
-        if (gridLineValue < 1) {
-          gridLineText = gridLineValue.toStringAsPrecision(4);
-        } else if (gridLineValue < 999) {
-          gridLineText = gridLineValue.toStringAsFixed(2);
-        } else {
-          gridLineText = gridLineValue.round().toString();
-        }
-
-        gridLineTextPainters.add(new TextPainter(
-            text: new TextSpan(
-                text: labelPrefix + gridLineText,
-                style: new TextStyle(
-                    color: gridLineLabelColor,
-                    fontSize: 10.0,
-                    fontWeight: FontWeight.bold)),
-            textDirection: TextDirection.ltr));
-        gridLineTextPainters[i].layout();
-      }
-    }
-  }
-
   @override
   void paint(Canvas canvas, Size size) {
-    double width = size.width - lineWidth;
+    final double width = size.width - lineWidth;
     final double height = size.height - lineWidth;
+    final double widthNormalizer = width / (dataPoints.length - 1);
     final double heightNormalizer = height / (_max - _min);
 
     final Path path = new Path();
@@ -303,33 +232,6 @@ class _SparklinePainter extends CustomPainter {
 
     Offset startPoint;
 
-    if (gridLineTextPainters.isEmpty) {
-      update();
-    }
-
-    if (enableGridLines) {
-      width = size.width - gridLineTextPainters[0].text.text.length * 6;
-      Paint gridPaint = new Paint()
-        ..color = gridLineColor
-        ..strokeWidth = gridLineWidth;
-
-      double gridLineDist = height / (gridLineAmount - 1);
-      double gridLineY;
-
-      // Draw grid lines
-      for (int i = 0; i < gridLineAmount; i++) {
-        gridLineY = (gridLineDist * i).round().toDouble();
-        canvas.drawLine(new Offset(0.0, gridLineY),
-            new Offset(width, gridLineY), gridPaint);
-
-        // Label grid lines
-        gridLineTextPainters[i]
-            .paint(canvas, new Offset(width + 2.0, gridLineY - 6.0));
-      }
-    }
-
-    final double widthNormalizer = width / dataPoints.length;
-
     for (int i = 0; i < dataPoints.length; i++) {
       double x = i * widthNormalizer + lineWidth / 2;
       double y =
@@ -413,11 +315,6 @@ class _SparklinePainter extends CustomPainter {
         fillGradient != old.fillGradient ||
         pointsMode != old.pointsMode ||
         pointSize != old.pointSize ||
-        pointColor != old.pointColor ||
-        enableGridLines != old.enableGridLines ||
-        gridLineColor != old.gridLineColor ||
-        gridLineAmount != old.gridLineAmount ||
-        gridLineWidth != old.gridLineWidth ||
-        gridLineLabelColor != old.gridLineLabelColor;
+        pointColor != old.pointColor;
   }
 }