# Isochronic — Really Easy Brain Entrainment

> Tool for generating and customizing isochronic tones for brainwave entrainment. (iPhone/iPad app by Carlos Mauricio López Londoño.)

- Source: https://appshunter.io/ios/app/isochronic/id604028966 (this page in markdown: same URL + `.md`)
- Developer: [Carlos Mauricio López Londoño](https://appshunter.io/developer/491766302)
- Category: Health & Fitness, Lifestyle
- Price: $5.99
- Rating: 4.84/5 from 67 App Store ratings · 50 written reviews indexed
- Age rating: 9+
- Requires: iOS 12.0 · 3 MB
- Languages: English
- Released: 2013-02-21
- Data updated: 2026-06-21
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/isochronic/id604028966/reviews.md

## What is Isochronic?

The Isochronic Tone Generator does just what it says: You can create any Isochronic Tone (between 0.01 and 50Hz) with a carrier between 50 and 999Hz. 

You can also mix the tone with your own music, set the wave volume in the mix, set a timer (up to 59 mins), program target isochronic frequencies for your brain entrainment sessions, use presets to start easy entrainment sessions and memory slots to put your favorite tones.

As simple as it gets... Enjoy!

FEATURES:
=======

* Variable carrier tone
* Variable isochronic tone
* Fine tune for carrier, isochronic and target frequencies
* Mix the tone with your own music
* Wave volume for better mixing
* Timer (up to 59 minutes)
* Entrainment sessions: Just set the target frequency using the black indicator below the isochronic tone.
* Presets (sleep, relax, awake and meditate)
* Memory slots: for having your favorite tones one tap away

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Isochronic tones are regular beats of a single tone used for brainwave entrainment. Similar to monaural beats, the interference pattern that produces the beat is outside the brain so headphones are not required for entrainment to be effective. They differ from monaural beats, which are constant sine wave pulses rather than entirely separate pulses of a single tone. As the contrast between noise and silence is more pronounced than the constant pulses of monaural beats, the stimulus is stronger and has a greater effect on brain entrainment (taken from: http://www.mindalive.com/articleeleven.htm)

-------------------------

Isochronic beats are not intended to treat or cure any disease, nor should any of the subject matter presented on this app or website be taken as medical advice. Please consult your doctor if you have a medical condition.
The products on this website have not been evaluated by the Food and Drug Administration (FDA).
People with epilepsy should not use mind entrainment products without the approval of an appropriate medical physician. However rare, there is a risk of seizure associated with individuals who are predisposed to seizures. Consult your doctor directly if you have any questions or concerns regarding Isochronic beat technology's effect on epilepsy.
Do not drive a car or operate dangerous machinery while listening to this product. This technology can produce hyper-relaxed states that can interfere with your ability to react as needed while driving or operating machinery.
There are no known contraindications to medication or chemical therapies, but if in doubt, consult your doctor. If you have any questions consult the doctor who provides your treatment.

## Key features

- Custom isochronic tone generation
- Carrier tone adjustment
- Mix with own music
- Adjustable wave volume
- Timer up to 59 minutes
- Preset sessions
- Memory slots for favorite tones

## Recent user reviews (10 of 50)

All indexed reviews: https://appshunter.io/ios/app/isochronic/id604028966/reviews.md

### 5/5 — Awesome

*2026-01-10*

I enjoy being able to customize and save tones that fit my needs.

### 3/5 — Clicking Effect in Speakers

*2025-11-09*

The app seems to produce a “clicking” effect when run through a good set of powered speakers. The clicking effect stops when run at the same time as another app that is simultaneously playing music.

**Developer response:** May you tell us which freqs were playing in the app? Thanks a lot

### 5/5 — Awesome app

*2025-05-09*

Hi! I love everything about this app. Thank you for creating it!! 

One request: is it possible to extend the timer? I want to be able to play the sound for more than an hour. Thank you!

### 5/5 — Simple and excellent

*2024-12-24, version 1.9*

Delivers custom isochronic tones

### 4/5 — Useful, besides random pausing

*2024-11-23*

The tone will pause randomly when I receive a notification. Besides that, I enjoy the app and the UI

### 5/5 — Exactly it + nothing more = AWESOME

*2024-08-30*

Isochronic tones with a simple Interface — that’s it.  You can layer other apps over this one for any effect you want . . . and the isochronics are already handled.

### 5/5 — Use it for focus and sleep

*2024-07-12*

Whenever I need to hunker down and get work done, I start this app along with some background music and—idk if it’s the placebo effect or what—I can get stuff done so efficiently. Same with sleep. I listen to a podcast before bed and have this on in the background and I can feel myself being slowly lulled.

### 5/5 — it works with media!

*2023-12-26, version 1.9*

i really wanted to play isochronic tones over other media like music or youtube, but for the most part ios doesn’t really allow that. i’m thrilled to find that this app works in the background! i would like to be able to change the amount of time over which the tones ramp to the target frequency since it currently happens very quickly and i don’t find that very useful, and if we could tell it to play x frequency for y minutes followed by x frequency for y minutes with multiple sections it would be really cool for all sorts of stuff like falling asleep or getting started in a project.

### 4/5 — Simple and effective tool

*2023-12-06*

This is a very simple and useful tool for entrainment. I used it to experiment with my meditation and inducing faster deeper entry into meditative state. It worked for me. I’m going to try it for others things now ( studying, staying alert, etc). The one thing I wish the app would do is gradually ramp down volume as it reaches the time to stop versus a hard stop as it does now. Overall, the app is well done. Thank you.

### 5/5 — Brilliant app!

*2023-09-01*

Does exactly what it needs to, works brilliantly and is by far the best one I've found. I highly recommend it.

## Frequently asked questions about Isochronic

### What is an isochronic tone?

Isochronic tones are regular beats of a single tone used for brainwave entrainment. Unlike monaural beats, they consist of separate pulses of a single tone, creating a stronger stimulus for brain entrainment.

### What can I do with the Isochronic Tone Generator app?

You can create custom isochronic tones with variable carrier frequencies, mix them with your own music, set a timer for sessions up to 59 minutes, and use presets for sleep, relaxation, or meditation. You can also save your favorite tones.

### Is this app free to use?

Yes, the Isochronic Tone Generator app is free to use. It does not contain in-app purchases or advertisements.

### Do I need headphones to use this app?

No, headphones are not required for entrainment to be effective with isochronic tones. The interference pattern that produces the beat is outside the brain.

### Who should not use this app?

Individuals with epilepsy should not use mind entrainment products without the approval of a medical physician. It is also advised not to drive or operate dangerous machinery while listening, as the technology can induce hyper-relaxed states.

## Version history (last 5 releases)

### 1.9 — 2023-01-13

New GUI and support for all new iphone models

### 1.8 — 2019-06-12

Now with presets (sleep, relax, awake and meditate) and memory slots for your favorite entrainment tones.

### 1.7 — 2017-04-23

Long time, no see!

- Now the isochronic app supports all the new iPhone models and works with the latests SDKs (improved sound for some and better use of your hardware for all)
- Lower start for the isochronic frequency (Now starts at 0.0Hz, I guess it won't get much lower than that) with the great sound quality you are familiar with.
- The carrier frequency now goes from 50 to 999Hz
- Compatible with iOS 8 and higher

### 1.6 — 2013-07-10

Now you can have entrainment sessions!!

Just move the small black indicator below the isochronic control and go from one frequency to another.

- More UI tweaks

### 1.5 — 2013-05-18

- Timer up to 30 mins (thanks for your patience on this one, we wanted it to work nice and well)
- UI Tweaks
- Scrollable UI for smaller screens

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## More apps by Carlos Mauricio López Londoño

- [Tarot Astro-Logica](https://appshunter.io/ios/app/tarot-astro-logica/id491766299)
- [Taimer](https://appshunter.io/ios/app/taimer/id1668844127)

All apps by Carlos Mauricio López Londoño: https://appshunter.io/developer/491766302

## Related topics

[isochronic](https://appshunter.io/ios/topics/isochronic) · [cml studio](https://appshunter.io/ios/topics/cml-studio)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-21.*