diff --git a/src/components/modals/isochronic/index.ts b/src/components/modals/isochronic/index.ts
new file mode 100644
index 0000000..e4512eb
--- /dev/null
+++ b/src/components/modals/isochronic/index.ts
@@ -0,0 +1 @@
+export { IsochronicModal } from './isochronic';
diff --git a/src/components/modals/isochronic/isochornic.module.css b/src/components/modals/isochronic/isochornic.module.css
new file mode 100644
index 0000000..fdbd99d
--- /dev/null
+++ b/src/components/modals/isochronic/isochornic.module.css
@@ -0,0 +1 @@
+/* WIP */
diff --git a/src/components/modals/isochronic/isochronic.tsx b/src/components/modals/isochronic/isochronic.tsx
new file mode 100644
index 0000000..d99eaa9
--- /dev/null
+++ b/src/components/modals/isochronic/isochronic.tsx
@@ -0,0 +1,245 @@
+import { useEffect, useState, useRef, useCallback } from 'react';
+
+import { Modal } from '@/components/modal';
+
+import styles from './isochornic.module.css';
+
+interface IsochronicProps {
+  onClose: () => void;
+  show: boolean;
+}
+
+interface Preset {
+  baseFrequency: number;
+  beatFrequency: number;
+  name: string;
+}
+
+const presets: Preset[] = [
+  { baseFrequency: 100, beatFrequency: 2, name: 'Delta (Deep Sleep) 2 Hz' },
+  { baseFrequency: 100, beatFrequency: 5, name: 'Theta (Meditation) 5 Hz' },
+  { baseFrequency: 100, beatFrequency: 10, name: 'Alpha (Relaxation) 10 Hz' },
+  { baseFrequency: 100, beatFrequency: 20, name: 'Beta (Focus) 20 Hz' },
+  { baseFrequency: 100, beatFrequency: 40, name: 'Gamma (Cognition) 40 Hz' },
+  { baseFrequency: 440, beatFrequency: 10, name: 'Custom' },
+];
+
+export function IsochronicModal({ onClose, show }: IsochronicProps) {
+  const [baseFrequency, setBaseFrequency] = useState<number>(440); // Default A4 note
+  const [beatFrequency, setBeatFrequency] = useState<number>(10); // Default 10 Hz beat
+  const [volume, setVolume] = useState<number>(0.5); // Default volume at 50%
+  const [waveform, setWaveform] = useState<OscillatorType>('sine'); // Default waveform
+  const [isPlaying, setIsPlaying] = useState<boolean>(false);
+  const [selectedPreset, setSelectedPreset] = useState<string>('Custom');
+
+  const audioContextRef = useRef<AudioContext | null>(null);
+  const oscillatorRef = useRef<OscillatorNode | null>(null);
+  const gainNodeRef = useRef<GainNode | null>(null);
+  const beatGainRef = useRef<GainNode | null>(null);
+  const modulatorRef = useRef<OscillatorNode | null>(null);
+
+  const startSound = () => {
+    if (isPlaying) return;
+
+    audioContextRef.current = new window.AudioContext();
+    const audioContext = audioContextRef.current;
+
+    if (!audioContext) return;
+
+    // Main gain node for volume control
+    gainNodeRef.current = audioContext.createGain();
+    gainNodeRef.current.gain.value = volume;
+
+    // Oscillator for the base tone
+    oscillatorRef.current = audioContext.createOscillator();
+    oscillatorRef.current.frequency.value = baseFrequency;
+    oscillatorRef.current.type = waveform;
+
+    // Gain node to create isochronic beats
+    beatGainRef.current = audioContext.createGain();
+    beatGainRef.current.gain.value = 0; // Start with silence
+
+    // Oscillator for modulation
+    modulatorRef.current = audioContext.createOscillator();
+    modulatorRef.current.frequency.value = beatFrequency;
+    modulatorRef.current.type = 'square'; // Square wave for on/off effect
+
+    // Modulator gain to adjust modulation depth
+    const modulatorGain = audioContext.createGain();
+    modulatorGain.gain.value = 0.5; // Modulation depth
+
+    // Connect modulator to the beat gain node
+    modulatorRef.current
+      .connect(modulatorGain)
+      .connect(beatGainRef.current.gain);
+
+    // Connect oscillator through beat gain and main gain to destination
+    oscillatorRef.current
+      .connect(beatGainRef.current)
+      .connect(gainNodeRef.current)
+      .connect(audioContext.destination);
+
+    // Start oscillators
+    oscillatorRef.current.start();
+    modulatorRef.current.start();
+
+    setIsPlaying(true);
+  };
+
+  const stopSound = useCallback(() => {
+    if (!isPlaying) return;
+
+    oscillatorRef.current?.stop();
+    modulatorRef.current?.stop();
+    audioContextRef.current?.close();
+
+    setIsPlaying(false);
+  }, [isPlaying]);
+
+  useEffect(() => {
+    // Update gain when volume changes
+    if (gainNodeRef.current) {
+      gainNodeRef.current.gain.value = volume;
+    }
+  }, [volume]);
+
+  useEffect(() => {
+    // Update base frequency when it changes
+    if (oscillatorRef.current) {
+      oscillatorRef.current.frequency.value = baseFrequency;
+    }
+  }, [baseFrequency]);
+
+  useEffect(() => {
+    // Update beat frequency when it changes
+    if (modulatorRef.current) {
+      modulatorRef.current.frequency.value = beatFrequency;
+    }
+  }, [beatFrequency]);
+
+  useEffect(() => {
+    // Update waveform when it changes
+    if (oscillatorRef.current) {
+      oscillatorRef.current.type = waveform;
+    }
+  }, [waveform]);
+
+  useEffect(() => {
+    // Cleanup when component unmounts
+    return () => {
+      if (isPlaying) {
+        stopSound();
+      }
+    };
+  }, [isPlaying, stopSound]);
+
+  useEffect(() => {
+    // Update frequencies when a preset is selected
+    if (selectedPreset !== 'Custom') {
+      const preset = presets.find(p => p.name === selectedPreset);
+      if (preset) {
+        setBaseFrequency(preset.baseFrequency);
+        setBeatFrequency(preset.beatFrequency);
+      }
+    }
+  }, [selectedPreset]);
+
+  const handlePresetChange = (e: React.ChangeEvent<HTMLSelectElement>) => {
+    const selected = e.target.value;
+    setSelectedPreset(selected);
+
+    if (selected === 'Custom') {
+      // Allow user to input custom frequencies
+      return;
+    }
+
+    const preset = presets.find(p => p.name === selected);
+    if (preset) {
+      setBaseFrequency(preset.baseFrequency);
+      setBeatFrequency(preset.beatFrequency);
+    }
+  };
+
+  return (
+    <Modal show={show} onClose={onClose}>
+      <h2 className={styles.title}>Isochronic Tones</h2>
+      <div>
+        <label>
+          Presets:
+          <select value={selectedPreset} onChange={handlePresetChange}>
+            {presets.map(preset => (
+              <option key={preset.name} value={preset.name}>
+                {preset.name}
+              </option>
+            ))}
+          </select>
+        </label>
+      </div>
+      {selectedPreset === 'Custom' && (
+        <>
+          <div>
+            <label>
+              Base Frequency (Hz):
+              <input
+                max="2000"
+                min="20"
+                step="0.1"
+                type="number"
+                value={baseFrequency}
+                onChange={e => setBaseFrequency(parseFloat(e.target.value))}
+              />
+            </label>
+          </div>
+          <div>
+            <label>
+              Tone Frequency (Hz):
+              <input
+                max="40"
+                min="0.1"
+                step="0.1"
+                type="number"
+                value={beatFrequency}
+                onChange={e => setBeatFrequency(parseFloat(e.target.value))}
+              />
+            </label>
+          </div>
+          <div>
+            <label>
+              Waveform:
+              <select
+                value={waveform}
+                onChange={e => setWaveform(e.target.value as OscillatorType)}
+              >
+                <option value="sine">Sine</option>
+                <option value="square">Square</option>
+                <option value="sawtooth">Sawtooth</option>
+                <option value="triangle">Triangle</option>
+              </select>
+            </label>
+          </div>
+        </>
+      )}
+      <div>
+        <label>
+          Volume:
+          <input
+            max="1"
+            min="0"
+            step="0.01"
+            type="range"
+            value={volume}
+            onChange={e => setVolume(parseFloat(e.target.value))}
+          />
+        </label>
+      </div>
+      <div>
+        <button disabled={isPlaying} onClick={startSound}>
+          Start
+        </button>
+        <button disabled={!isPlaying} onClick={stopSound}>
+          Stop
+        </button>
+      </div>
+    </Modal>
+  );
+}
diff --git a/src/components/toolbar/menu/items/index.ts b/src/components/toolbar/menu/items/index.ts
index 162b7d4..158ff5f 100644
--- a/src/components/toolbar/menu/items/index.ts
+++ b/src/components/toolbar/menu/items/index.ts
@@ -11,3 +11,4 @@ export { Notepad as NotepadItem } from './notepad';
 export { Todo as TodoItem } from './todo';
 export { Countdown as CountdownItem } from './countdown';
 export { Binaural as BinauralItem } from './binaural';
+export { Isochronic as IsochronicItem } from './isochronic';
diff --git a/src/components/toolbar/menu/items/isochronic.tsx b/src/components/toolbar/menu/items/isochronic.tsx
new file mode 100644
index 0000000..f5b0988
--- /dev/null
+++ b/src/components/toolbar/menu/items/isochronic.tsx
@@ -0,0 +1,13 @@
+import { RiPlayListFill } from 'react-icons/ri/index';
+
+import { Item } from '../item';
+
+interface IsochronicProps {
+  open: () => void;
+}
+
+export function Isochronic({ open }: IsochronicProps) {
+  return (
+    <Item icon={<RiPlayListFill />} label="Isochronic Tones" onClick={open} />
+  );
+}
diff --git a/src/components/toolbar/menu/menu.tsx b/src/components/toolbar/menu/menu.tsx
index 0e2efb0..a985c30 100644
--- a/src/components/toolbar/menu/menu.tsx
+++ b/src/components/toolbar/menu/menu.tsx
@@ -18,6 +18,7 @@ import {
   TodoItem,
   CountdownItem,
   BinauralItem,
+  IsochronicItem,
 } from './items';
 import { Divider } from './divider';
 import { ShareLinkModal } from '@/components/modals/share-link';
@@ -26,6 +27,7 @@ import { ShortcutsModal } from '@/components/modals/shortcuts';
 import { SleepTimerModal } from '@/components/modals/sleep-timer';
 import { BreathingExerciseModal } from '@/components/modals/breathing';
 import { BinauralModal } from '@/components/modals/binaural';
+import { IsochronicModal } from '@/components/modals/isochronic';
 import { Pomodoro, Notepad, Todo, Countdown } from '@/components/toolbox';
 import { fade, mix, slideY } from '@/lib/motion';
 import { useSoundStore } from '@/stores/sound';
@@ -44,6 +46,7 @@ export function Menu() {
       binaural: false,
       breathing: false,
       countdown: false,
+      isochronic: false,
       notepad: false,
       pomodoro: false,
       presets: false,
@@ -120,6 +123,7 @@ export function Menu() {
                     <ShuffleItem />
                     <SleepTimerItem open={() => open('sleepTimer')} />
                     <BinauralItem open={() => open('binaural')} />
+                    <IsochronicItem open={() => open('isochronic')} />
 
                     <Divider />
                     <CountdownItem open={() => open('countdown')} />
@@ -168,6 +172,10 @@ export function Menu() {
         onClose={() => close('sleepTimer')}
       />
       <BinauralModal show={modals.binaural} onClose={() => close('binaural')} />
+      <IsochronicModal
+        show={modals.isochronic}
+        onClose={() => close('isochronic')}
+      />
     </>
   );
 }