Endel User Guide
Current Energy Level and Real-Time Inputs
These are the main ways that Endel provides sound personalization, all gathered with your permission. Learn more about energy levels and inputs here, otherwise ‘Tap for Details’ on the main screen.
Calms your mind and creates a feeling of comfort using soothing sound textures.
Helps you concentrate on tasks and keeps you in the flow with percussion harmonized to the human heartbeat.
Soothes you into restful and restorative sleep with delta wave modulation.
Find our recommendations for best use here.
- AirPlay (iOS)
Stream the sound to a wireless speaker or smart TV.
Schedule your next deep work session or just drift off to sleep.
- What’s New
Find important news about Endel and tips for daily well-being.
- Three Dots
Receive a Weekly Insights report, customize your Settings, or contact Support.
Short soundscapes designed for specific daily activities. Choose your option and set the custom timer — for your convenience, the count will be saved for future sessions.
Like our audio, animations react to changes in input. By the direction of the flow, you can quickly judge if the energy is rising or falling with a single glance.
Your weekly personal statistics. It updates every Monday when you use the app regularly.
Discover all the options here.
Send any thoughts or questions to our support team — but we appreciate it if you check our FAQ section for similar cases first.
You want to learn more about energy levels and personal inputs
Daily Energy Cycles
You should notice energy level hints at the main Endel screen, marking the current phase of biological rest-activity, and sleep-wake cycles — typically known as ultradian and circadian rhythms. Phases change every 20 minutes, with varying highs and lows that form a daily cycle. This variation is universal to life on Earth.
Harmonizing your periods of high and low activity with this cycle is a natural way to boost your daily productivity and wellbeing. See where you are on the chart below and choose your next move accordingly, then pick a matching Endel soundscape.
This is a basic 24-hours model of a perfectly productive day, as suggested by studies of human biological rhythms. Everyone is unique and deals with their own unique stresses, which shift this pattern. Our goal is to personalize this daily energy curve for every Endel user.
Ultradian rhythm is a rest-activity cycle that regulates cognitive state, mood, and energy level. It consists of roughly 110-minute loops of the energy’s up and down phases.
Circadian rhythm is a sleep-wake cycle that regulates the secretion of a sleep hormone called melatonin. It repeats every 24 hours and is constantly fine-tuned through natural light level.
Endel uses these universal rhythms as a baseline for sound personalization.
Personal inputs — heart rate, weather, motion type, and natural light — allow Endel to help you realign with the circadian and ultradian rhythms. This is made possible through an adaptive soundscape.
The most important input for the soundscape playing is shown in-app below the circadian/ultradian phase.
Light has the biggest impact on the circadian rhythm. Even if you aren't exposed to it directly, your body is sensitive to changes in light conditions. Endel tracks natural light level and compensates by adapting your soundscape, changing sound intensity to maximize your comfort level.
Endel adjusts the beat to your resting heart rate by comparing it to your real-time heart rate using data from the Health (iOS) or Google Fit (Android) app.
Endel reacts to outdoor temperature with sound layer variations.
Endel alters sound intensity according to the number of steps taken per minute.
Endel’s sound engine — Endel Pacific — consists of sound layers, modulations, and effects — all created in line with psychoacoustic studies. An algorithm processes user-state information and generates an appropriate soundscape by constructing unique combinations of Endel Pacific's components.
Soundscapes adjust automatically throughout the day and adapt based on user-state inputs — to provide the right sound intensity at any phase of the biological rhythms.
You have a promo code
Congratulations! Follow this activation link: https://code.endel.io
You want to cancel your subscription
On an iOS phone or tablet:
- Open the Settings app.
- Tap your name.
- Tap Subscriptions. (If you don't see "Subscriptions," tap "iTunes & App Store" instead. Then tap your Apple ID, tap View Apple ID, sign in, scroll down to Subscriptions, and tap Subscriptions.)
- Tap the subscription that you want to manage.
- Tap Cancel Subscription. If you don’t see Cancel Subscription, the subscription is already canceled and won't renew.
On an Android phone or tablet:
- Open the Google Play Store.
- Check you’re signed in to the correct Google Account.
- Tap Menu > 'Subscriptions'.
- Select Endel and tap 'Cancel subscription'.
On a Mac
- Open the App Store app.
- Click the sign-in button or your profile name on the bottom of the sidebar.
- Click 'View Information' at the top-right of the window.
- Scroll down to 'Subscriptions' and click 'Manage'.
- Click 'Edit' next to Endel subscription.
Please note: if not canceled properly, the subscription is seen by all the Stores as active (and subject to recurring payment) — even after you delete the app. This applies to any app, not exclusively Endel.
You want to upgrade your subscription to a lifetime plan
Thank you for this!
1. Cancel your subscription auto-renewal as explained in the item above ('You want to cancel your subscription')
2. Wait till your current subscription expires
3. Open the app and you'll see the Lifetime option on the payment screen
As technically the lifetime plan is not a subscription — it's a one-time purchase — none of the Stores let you upgrade your current plan via subscription management.
You want to enjoy Endel for free
First, you are welcome to try our apps.
The first week is always free, with no strings attached once you skip the initial payment screen by tapping 'X' in the top-right corner. Your free 7-days trial will then start automatically.
Then, there is a free version of Endel, compatible with any browser: https://play.endel.io/
For this special project, our algorithm teamed up with Toro y Moi and other artists he invited. Together they've created four new functional soundscapes — different from what you'll find on our apps. While the web version lacks a few personal inputs — such as your heart rate, motion, and weather — the soundscapes are still adaptive, evolving with the circadian rhythm and the time zone.
Finally, we stream our Sleep soundscape 24/7 on the Twitch website: https://twitch.tv/endel
Originally, designed for gamers to restore their sleep-wake cycles, but you are welcome to use it for your own benefit. This is the basic, non-personalized version of Endel, yet the sound is science-backed, and therefore healthful for your sleep.
It's up to you to decide which Endel format fits your needs best — they are all our favourites!
You miss the heart rate data in the app
To personalize the soundscapes, Endel uses real-time heart rate data.
Currently, only three smartwatch / tracking systems can provide that — Apple Watch for iOS mobiles, Wear OS by Google smartwatches and Samsung's Tizen for Android mobiles.
If you use Fitbit or other trackers, unfortunately they are not compatible with Endel's heart rate feature. But we are working on that, too!
You want to use heart rate data from your Galaxy Watch
Install Endel on your watch: https://galaxystore.samsung.com/geardetail/com.endel.tizen.watch After that, the app will receive data directly from the smartwatch (not through Google Fit).
You subscribed by mistake and want a refund
If you purchased your subscription through the App Store, you need to contact Apple Support directly. Here are refund instructions you might find useful: https://support.apple.com/en-us/HT204084. We wish we could help, but only the App Store can manage refunds for the purchases made with Apple iTunes accounts.
If you purchased your subscription through the Google Play Store, please send us your payment receipt at email@example.com within 30 days. You will find it in your inbox by searching for ‘Google Play Store.’ As soon as we have the transaction number from your receipt (starting with GPA), we will be able to refund the money. You’ll see it back in your bank account in 3–10 days.
Please note, we make refunds for the ‘12 Months’ subscription plans only.
You want to make sure that your account won't be billed when the free trial period ends
You haven't started the trial period:
Tap "X" in the top right corner on the payment screen. Your trial will start instantly — with no commitment to pay in 7 days.
You’ve already started the trial period:
Cancel the subscription in the Settings (iOS) or the Google Play Store, as explained above (refer to the item 'You want to cancel your subscription').
Please note: if not canceled properly, the subscription is seen as active (and subject to recurring payment) — even after you delete the app. This applies to all apps, not just Endel.
You don't see your subscription after an update
Tap "Restore purchases" on the payment screen (try "Settings" in the three-dots menu if you don't see it right away).
Your subscription will resume in a few moments.
You’ve been logged out of your Endel account after an update
- First, try logging in.
- If that fails, reset the password (tap the “?”).
- If that doesn’t work, too, create an account.
Don't worry, neither the App Store nor the Google Play Store will let you have two Endel subscriptions on the same device. So, you'll never pay twice — even if logging in with an email and then with Facebook, etc.
You want to use Endel on multiple devices
You want to use your subscription on multiple devices:
- Open Endel on the device used to purchase your subscription.
- Sign out of your account (tap the three dots > ‘Settings’).
- Sign in again using your email: this will link your Endel account with your email address. If you don't see your subscription, tap ‘Restore’.
- Sign in using the same email on any new device you’d like to use.
You want to use Endel offline
You can use Endel even with no internet connection. For example, on an airplane. Our algorithm generates sound directly on your device. However, when offline, you can’t purchase a subscription (as you need a Store app for it), read articles in the “What’s new” content section and contact support. But you will be able to relax, fall asleep, or focus for sure.
You want to change the language of the app
If you use Endel on an iOS device, you can change the app language in the General settings: find Endel in the application list, open Settings, and select your language in the Preferred Languages menu.
If you use Endel on an Android device, the app automatically switches to this device’s primary language. To change the language of Endel:
- Open Settings of your device.
- Scroll down to Additional settings, open.
- Tap on Languages & Input.
- In Languages, choose the preferred language.
If we haven’t translated Endel to your preferred language yet, you will see the app in English on any device.
Endel on Apple Watch
Main Screen Description
Tap the upper left corner to choose between Standalone and Companion modes for the Endel app:
— Standalone is a full-featured, independent app for the watchOS that allows you to use Endel without a phone;
— Companion is the remote for your Endel iOS app.
You’ll find the data that personalizes your Endel sounds in the same tab:
— real-time heart rate,
— natural light exposure,
— activity level,
— number of steps taken today.
To go back to the main screen, tap Cancel.
The arrow sign in the middle marks the real-time direction of the daily circadian rhythm. Read more about it here.
The graph underneath helps you understand when the current phase of the circadian rhythm ends and the next begins.
Plan your rest and activity throughout the day in line with the circadian rhythm, and choose the right Endel soundscape for the energy levels shown on the screen.
Select a soundscape using the buttons at the bottom of your screen. Tap here for recommendations on daily use.
Customize your Watch Face with Endel complications. They allow you to know at a glance what phase of the circadian rhythm you’re in at the moment, as well as its duration (in some complications).
Here’s how to add information from Endel to your watch face:
- Open the Watch app on your iPhone.
- Tap the My Watch tab, then tap Complications.
- Click on Change and select Endel from the list of applications.
- Firmly press the display on your watch and tap Customize.
- Swipe left to the edge of the display. If you can add complications to your watch face, they will be listed on the last screen.
- Tap a complication to select it, then turn the Digital Crown to choose the Endel complication.
- When finished, press the Digital Crown to save changes, then tap the Endel complication icon from your watch face to open it.
- You are keen to know more about Endel
You like the app and want to help
Rate Endel on the App Store or Google Play Store.
And just keep using the app. With your friends, perhaps?
Have more questions? Submit a request