diff --git a/app/src/chart/component/edit/Waveform.ts b/app/src/chart/component/edit/Waveform.ts
index cc1e5b2b..81e9d1a0 100644
--- a/app/src/chart/component/edit/Waveform.ts
+++ b/app/src/chart/component/edit/Waveform.ts
@@ -1,10 +1,12 @@
 import {
+  Color,
   FXAAFilter,
   ParticleContainer,
   RenderTexture,
   Sprite,
   Texture,
 } from "pixi.js"
+import { colorFallback } from "../../../util/Color"
 import { EventHandler } from "../../../util/EventHandler"
 import { clamp } from "../../../util/Math"
 import { Options } from "../../../util/Options"
@@ -51,6 +53,9 @@ export class Waveform extends Sprite implements ChartRendererComponent {
   private drawDirty = true
   private blockCache = new Map<string, number[]>()
 
+  private colorCache = new Color("black")
+  private filteredColorCache = new Color("black")
+
   constructor(renderer: ChartRenderer) {
     super()
     this.renderer = renderer
@@ -95,8 +100,6 @@ export class Waveform extends Sprite implements ChartRendererComponent {
       () => this.renderer.chartManager.app.renderer.screen.height,
       () => this.resizeWaveform()
     )
-    this.trackVariable(() => Options.chart.waveform.opacity)
-    this.trackVariable(() => Options.chart.waveform.filteredOpacity)
     this.trackVariable(() => Options.chart.waveform.filteredColor)
     this.trackVariable(() => Options.chart.waveform.color)
     this.trackVariable(() => Options.chart.waveform.speedChanges)
@@ -165,6 +168,16 @@ export class Waveform extends Sprite implements ChartRendererComponent {
 
     if (!Options.chart.waveform.enabled) return
     if (this.drawDirty || this.variableChanged()) {
+      if (this.colorCache.toHexa() != Options.chart.waveform.color) {
+        this.colorCache = colorFallback(Options.chart.waveform.color)
+      }
+      if (
+        this.filteredColorCache.toHexa() != Options.chart.waveform.filteredColor
+      ) {
+        this.filteredColorCache = colorFallback(
+          Options.chart.waveform.filteredColor
+        )
+      }
       this.drawDirty = false
       this.renderData()
       this.renderer.chartManager.app.renderer.render(this.lineContainer, {
@@ -471,8 +484,8 @@ export class Waveform extends Sprite implements ChartRendererComponent {
         16 *
         Options.chart.zoom
       line.y = y
-      line.tint = Options.chart.waveform.color
-      line.alpha = Options.chart.waveform.opacity
+      line.tint = this.colorCache
+      line.alpha = this.colorCache.alpha
       line.x =
         this.waveformTex.width / 2 +
         288 * (channel + 0.5 - this.rawData.length / 2) * Options.chart.zoom
@@ -482,8 +495,8 @@ export class Waveform extends Sprite implements ChartRendererComponent {
         this.getSample(this.filteredRawData[channel], second, "filter") *
         16 *
         Options.chart.zoom
-      filteredLine.tint = Options.chart.waveform.filteredColor
-      filteredLine.alpha = Options.chart.waveform.filteredOpacity
+      filteredLine.tint = this.filteredColorCache
+      filteredLine.alpha = this.filteredColorCache.alpha
       filteredLine.y = y
       filteredLine.x =
         this.waveformTex.width / 2 +
diff --git a/app/src/data/UserOptionsWindowData.ts b/app/src/data/UserOptionsWindowData.ts
index cb74be10..64909242 100644
--- a/app/src/data/UserOptionsWindowData.ts
+++ b/app/src/data/UserOptionsWindowData.ts
@@ -1,3 +1,4 @@
+import { Color } from "pixi.js"
 import { App } from "../App"
 import { TimingWindowCollection } from "../chart/play/TimingWindowCollection"
 
@@ -94,7 +95,7 @@ interface UserOptionCheckboxInput {
 
 interface UserOptionColorInput {
   type: "color"
-  onChange?: (app: App, value: number) => void
+  onChange?: (app: App, value: Color) => void
 }
 
 type UserOptionInput<T> =
@@ -416,17 +417,6 @@ export const USER_OPTIONS_WINDOW_DATA: UserOption[] = [
                   type: "color",
                 },
               },
-              {
-                type: "item",
-                label: "Opacity",
-                id: "chart.waveform.opacity",
-                input: {
-                  type: "slider",
-                  min: 0,
-                  max: 1,
-                  step: 0.01,
-                },
-              },
             ],
           },
           {
@@ -448,17 +438,6 @@ export const USER_OPTIONS_WINDOW_DATA: UserOption[] = [
                   type: "color",
                 },
               },
-              {
-                type: "item",
-                label: "Filtered opacity",
-                id: "chart.waveform.filteredOpacity",
-                input: {
-                  type: "slider",
-                  min: 0,
-                  max: 1,
-                  step: 0.01,
-                },
-              },
             ],
           },
           {
diff --git a/app/src/gui/element/ColorPicker.ts b/app/src/gui/element/ColorPicker.ts
index 5428c47a..13e6ae37 100644
--- a/app/src/gui/element/ColorPicker.ts
+++ b/app/src/gui/element/ColorPicker.ts
@@ -1,26 +1,27 @@
 import { Color } from "pixi.js"
-import { colorToHsla, colorToHsva } from "../../util/Color"
+import { colorFallback, colorToHsla, colorToHsva } from "../../util/Color"
 import { clamp } from "../../util/Math"
 
 class TransparentPreview extends HTMLDivElement {
   colorElement!: HTMLDivElement
-  static create() {
-    const bg = document.createElement("div") as TransparentPreview
-    bg.classList.add("color-picker-transparent")
-    Object.setPrototypeOf(bg, TransparentPreview.prototype)
-    const color = document.createElement("div")
-    color.style.width = "100%"
-    color.style.height = "100%"
-    bg.colorElement = color
-    bg.appendChild(color)
-    return bg
-  }
 
   set color(value: Color) {
     this.colorElement.style.background = value.toHexa()
   }
 }
 
+function createTransparent() {
+  const bg = document.createElement("div") as TransparentPreview
+  bg.classList.add("color-picker-transparent")
+  Object.setPrototypeOf(bg, TransparentPreview.prototype)
+  const color = document.createElement("div")
+  color.style.width = "100%"
+  color.style.height = "100%"
+  bg.colorElement = color
+  bg.appendChild(color)
+  return bg
+}
+
 interface ColorFormatInputOptions {
   setValue: (color: Color) => string
   isValid: (value: string) => string | null
@@ -158,10 +159,10 @@ export class ColorPicker extends TransparentPreview {
 
   onColorChange?: (color: Color) => void
 
-  static createPicker(options: ColorPickerOptions): ColorPicker {
-    const picker = TransparentPreview.create() as ColorPicker
+  static create(options: ColorPickerOptions): ColorPicker {
+    const picker = createTransparent() as ColorPicker
     Object.setPrototypeOf(picker, ColorPicker.prototype)
-    picker.value = new Color(options.value)
+    picker.value = colorFallback(options.value)
     picker.classList.add("color-picker")
     picker.formats = []
 
@@ -266,7 +267,10 @@ export class ColorPicker extends TransparentPreview {
     const [hueSlider, hueThumb] = this.createSlider({
       ondrag: () => (this.hueDragging = true),
       offdrag: () => (this.hueDragging = false),
-      change: v => (this.hue = v),
+      change: v => {
+        this.hue = v
+        this.onColorChange?.(this._value)
+      },
     })
     this.hueThumb = hueThumb
     hueSlider.style.background =
@@ -275,7 +279,10 @@ export class ColorPicker extends TransparentPreview {
     const [alphaSlider, alphaThumb] = this.createSlider({
       ondrag: () => (this.alphaDragging = true),
       offdrag: () => (this.alphaDragging = false),
-      change: v => (this.alpha = v),
+      change: v => {
+        this.alpha = v
+        this.onColorChange?.(this._value)
+      },
     })
     this.alphaThumb = alphaThumb
     alphaSlider.classList.add("color-picker-transparent")
@@ -431,8 +438,8 @@ export class ColorPicker extends TransparentPreview {
     const previewContainer = document.createElement("div")
     previewContainer.classList.add("color-picker-preview")
 
-    const previewNew = TransparentPreview.create()
-    const previewOld = TransparentPreview.create()
+    const previewNew = createTransparent()
+    const previewOld = createTransparent()
     previewOld.color = this._value
     previewNew.color = this._value
     previewContainer.replaceChildren(previewNew, previewOld)
@@ -477,7 +484,7 @@ export class ColorPicker extends TransparentPreview {
   updatePopup() {
     if (!this.popup) return
     this.matrix!.style.backgroundColor = `hsl(${this._hue * 360} 100% 50%)`
-    this.matrixDot!.style.backgroundColor = this._value.toRgbaString()
+    this.matrixDot!.style.backgroundColor = this._value.toHex()
     if (!this.matrixDragging) {
       this.matrixDot!.style.left = this._sat * 200 + "px"
       this.matrixDot!.style.top = (1 - this._val) * 200 + "px"
diff --git a/app/src/gui/widget/NPSGraphWidget.ts b/app/src/gui/widget/NPSGraphWidget.ts
index b4543f94..89ab32db 100644
--- a/app/src/gui/widget/NPSGraphWidget.ts
+++ b/app/src/gui/widget/NPSGraphWidget.ts
@@ -1,5 +1,5 @@
 import { BitmapText, FederatedPointerEvent, Graphics, Texture } from "pixi.js"
-import { assignTint } from "../../util/Color"
+import { assignTint, colorFallback } from "../../util/Color"
 import { EventHandler } from "../../util/EventHandler"
 import { clamp, lerp, unlerp } from "../../util/Math"
 import { Options } from "../../util/Options"
@@ -227,14 +227,8 @@ export class NPSGraphWidget extends BaseTimelineWidget {
     // use canvas2d API to create gradient
     const grd = ctx.createLinearGradient(0, 0, quality, 0)
 
-    const color1 = `#${Options.chart.npsGraph.color1
-      .toString(16)
-      .padStart(6, "0")}`
-    const color2 = `#${Options.chart.npsGraph.color2
-      .toString(16)
-      .padStart(6, "0")}`
-    grd.addColorStop(0, color1)
-    grd.addColorStop(0.8, color2)
+    grd.addColorStop(0, colorFallback(Options.chart.npsGraph.color1).toHexa())
+    grd.addColorStop(0.8, colorFallback(Options.chart.npsGraph.color2).toHexa())
 
     ctx.fillStyle = grd
     ctx.fillRect(0, 0, quality, quality)
diff --git a/app/src/gui/window/ThemeWindow.ts b/app/src/gui/window/ThemeWindow.ts
index 8b73908e..497da0f4 100644
--- a/app/src/gui/window/ThemeWindow.ts
+++ b/app/src/gui/window/ThemeWindow.ts
@@ -111,7 +111,7 @@ export class ThemeWindow extends Window {
     const colorLabel = document.createElement("div")
     colorLabel.classList.add("theme-color-detail")
 
-    const colorPicker = ColorPicker.createPicker({
+    const colorPicker = ColorPicker.create({
       value: "white",
       width: 30,
       height: 30,
diff --git a/app/src/gui/window/UserOptionsWindow.ts b/app/src/gui/window/UserOptionsWindow.ts
index 3d98d77a..0331c42c 100644
--- a/app/src/gui/window/UserOptionsWindow.ts
+++ b/app/src/gui/window/UserOptionsWindow.ts
@@ -10,6 +10,7 @@ import { clamp, roundDigit } from "../../util/Math"
 import { Options } from "../../util/Options"
 import { parseString } from "../../util/Util"
 import { Icons } from "../Icons"
+import { ColorPicker } from "../element/ColorPicker"
 import { Dropdown } from "../element/Dropdown"
 import { NumberSpinner } from "../element/NumberSpinner"
 import { Window } from "./Window"
@@ -337,22 +338,19 @@ export class UserOptionsWindow extends Window {
         }
         case "color": {
           const callback = option.input.onChange
-          const colorInput = document.createElement("input")
-          colorInput.type = "color"
-          colorInput.value = "#" + optionValue.toString(16).padStart(6, "0")
+          const colorInput = ColorPicker.create({
+            value: optionValue,
+          })
           // 'change' event is fired when the user closes the color picker
-          colorInput.oninput = () => {
-            Options.applyOption([
-              option.id,
-              parseInt(colorInput.value.slice(1), 16),
-            ])
+          colorInput.onColorChange = c => {
+            Options.applyOption([option.id, c.toHexa()])
             EventHandler.emit("userOptionUpdated", option.id)
             revert.style.display =
               Options.getDefaultOption(option.id) ===
               Options.getOption(option.id)
                 ? "none"
                 : "block"
-            callback?.(this.app, parseInt(colorInput.value.slice(1), 16))
+            callback?.(this.app, c)
           }
           input = colorInput
         }
diff --git a/app/src/util/Color.ts b/app/src/util/Color.ts
index 85c1d8f9..8d751744 100644
--- a/app/src/util/Color.ts
+++ b/app/src/util/Color.ts
@@ -149,3 +149,14 @@ export function colorToHsva(color: Color) {
 
   return [h, s, v, a]
 }
+
+export function colorFallback(
+  colorString: ColorSource,
+  fallback?: ColorSource
+) {
+  try {
+    return new Color(colorString)
+  } catch (e) {
+    return new Color(fallback ?? "black")
+  }
+}
diff --git a/app/src/util/Options.ts b/app/src/util/Options.ts
index 2c4effe5..4d3e482a 100644
--- a/app/src/util/Options.ts
+++ b/app/src/util/Options.ts
@@ -45,11 +45,9 @@ export class DefaultOptions {
     waveform: {
       enabled: true,
       antialiasing: true,
-      color: 0x606172,
-      opacity: 0.5,
+      color: "#60617288",
       allowFilter: true,
-      filteredColor: 0x1e523e,
-      filteredOpacity: 0.5,
+      filteredColor: "#1e523e88",
       lineHeight: 1,
       speedChanges: true,
     },
@@ -58,8 +56,8 @@ export class DefaultOptions {
     },
     npsGraph: {
       enabled: false,
-      color1: 0x4aa7bc,
-      color2: 0x423c7a,
+      color1: "#4aa7bcff",
+      color2: "#423c7aff",
     },
     timingEventOrder: {
       left: [