What isochronic tones are
Isochronic tones are audible pulses repeated at a very specific frequency, on top of a base tone called the carrier. If the carrier is 200 Hz and the pulse frequency is 14 Hz, the brain hears a “tap-tap-tap” 14 times per second over that background tone.
What’s interesting isn’t the sound itself, but what happens in the brain. When you listen to a steady rhythmic pulse at a very stable frequency, cortical brainwaves tend to partially synchronise with that pulse — a well-documented phenomenon known as frequency following response. It’s the same reason listening to music at a specific BPM helps you run to that rhythm.
If the pulse is in the Beta band (13–30 Hz), it’s associated with focused, awake attention states. If it’s in the Gamma band (30–50 Hz), it’s associated with problem solving, creativity and intense cognitive processing.
Unlike binaural tones, isochronic ones don’t need headphones because the pulse is already modulated into the sound itself. They work on speakers. Still, with headphones you isolate from ambient noise better.
How to use this generator
- Pick a band. Beta for tasks requiring sustained attention (writing, studying, coding). Gamma for creative or complex problem-solving tasks.
- Adjust the pulse frequency. Each band has a range. A rough guide:
- Low Beta (13–17 Hz): relaxed focus, reading.
- Mid Beta (17–24 Hz): active work, writing.
- High Beta (24–30 Hz): demanding tasks, urgency.
- Low Gamma (30–40 Hz): creativity, brainstorming.
- High Gamma (40–50 Hz): complex problem solving.
- Adjust the carrier. Anywhere from 100 to 500 Hz works; 200 Hz is a comfortable middle point. Lower frequencies sound bassier, higher ones more treble.
- Adjust the volume. Start low and raise it until it’s audible but not annoying. It doesn’t need to be loud — the effect depends on the pulse, not the volume.
- Hit start. Work for as long as you want. The counter tells you how long you’ve been listening.
Practical tips
Short sessions at first. If you’ve never used isochronic tones before, start with 10–15 minute blocks. Some people notice the effect immediately; others need several sessions to identify it.
You don’t need to actively listen. In fact, the ideal is to play them in the background, at low volume, while you work. If you focus on the sound, they distract you.
Combine with the Pomodoro technique. If you want a version with a 25/5 timer integrated, try the free online Pomodoro on this same site.
Hydrate. It sounds like a cliché, but deep work sessions dehydrate you more than you think. Keep water close.
What the Mind Focus app adds
This generator is a basic, honest sample. The Mind Focus app goes several steps further for anyone wanting to turn this into a daily tool:
- Circadian rhythms: the optimal pulse frequency varies with the time of day. The app adjusts it automatically.
- Dynamic ramping: in Ultrafocus mode, the frequency climbs progressively from 14 Hz to 40 Hz across the block, taking the brain from Beta to Gamma without abrupt jumps.
- Tones designed for rest: Alpha and Theta bands for the relaxation and breathwork modes, with textures that aren’t just square pulses.
- Integrated Pomodoro and Flowmodoro: the timer and the tones cooperate, they aren’t two separate things.
- Attention training: the app doesn’t just help you focus now, it trains your attention long term.
- Works with screen locked: the native app keeps audio going even if you lock your phone. The browser doesn’t.
FAQ
Are isochronic tones safe? For most people, yes. If you have epilepsy, a history of seizures or a neurological disorder, consult your doctor before using isochronic or binaural tones for prolonged periods.
How long until I notice the effect? It varies a lot. Some people notice easier concentration in the first session; others need several. The effect is subtle, it’s not like coffee.
Why not use binaurals? Binaurals require decent stereo headphones to work well. Isochronics work on any speaker. For casual use, isochronics are more practical.
Can I close the tab? If you close it, the tone stops. If you only switch tabs on mobile, the browser usually pauses it automatically.
Why is there a volume cap? For hearing safety. You don’t need high volume for the tones to work.