Sleep and wake better with LARK, a revolutionary silent alarm clock and personal sleep coach. Developed with the world’s leading sleep experts, LARK works with its LARK Up app to evaluate your sleep data, empower you to improve, and wake you (and only you) silently with a vibrating alarm. Begin your sleep coaching experience with a 7-Day Sleep Assessment and within a week you're well on your way to a well-rested you.

Note: This app is intended to be used with a LARK wristband accessory.
To purchase one, please visit our website at

Silent Alarm Clock. Wake like never before – gently, and silently, without disturbing your sleeping partner.

• A silent and peaceful wakeup, designed with sleep experts to be highly effective

• No more disrupting your partner’s or roommate’s sleep with your noisy alarm clock

• Guaranteed alarm, even when phone battery dies

• Familiar alarm clock interface – large snooze button and numerical display

• Adjustable snooze time

• Peace of Mind feature: an adjustable backup audio alarm that plays composer-created audio
 if it does not receive a response from you within a few minutes after your alarm goes off.
• Automatically dimming clock interface.

Personal Sleep Coach. Helps you understand your sleep and guides you to improve it in the simplest and easiest ways.

• Micromovement wrist sleep pattern sensor picks up patterns while you sleep.

• 7-Day Sleep Assessment—a baseline assessment designed with sleep experts to uncover your Sleep Type.
• 7-Day Sleep Report-- a detailed report that gives you a personalized, actionable plan on how you can sleep better based on your sleep pattern data.
• Sleep Coach shows how you slept, how our sleep compares to both your average and healthy sleepers and monitors your sleep on a weekly, monthly and overall basis.
• Ability to tag factors and feelings to find out what is affecting your sleep and how your sleep affects your mood.
• Motivational coaching with messages as you improve and reach your sleep goal.

How does it work?

Use the LARK Up app to set your wake up time and alarm settings. Turn on the alarm and your iPhone will wirelessly transfer your alarm settings and sleep patterns to your LARK wristband. Strap on the lightweight, hassle-free wristband and go to sleep. The micromovement sensor will pick up your sleep patterns, and when it’s time to wake up, your LARK wristband will vibrate and nudge you awake. Press the big snooze button to snooze or slide the stop button across the screen to wake.

Your Personal Sleep Coach will then display your sleep quality and patterns immediately on your screen showing you how you slept during the night and how you fare in comparison to your average and healthy sleepers, all wirelessly. At the end of your 7th night of activating your 7-Day Sleep Assessment, your Personal Sleep Coach will unveil your Sleep Type and provide a personalized action plan and tailored sleep goals to help you improve your sleep.

Option: Use LARK Pro, a subscription upgrade, and your Personal Sleep Coach will be even richer with tools to help you sleep better.
Wake your potential. Not your partner.

What’s New

Version 1.2.11

+ Bug fixes

Ratings and Reviews

3.3 out of 5
248 Ratings

248 Ratings

yadsl ,

Good product So So app

The lark wrist strap is great as the alarm gently vibrates, waking you up without waking anyone else. Kudos for that concept. However it's really awkward to dock in its base especially if you've just woken up. The app on the iphone is ok but the graphics are microscopic and if you wake up before the alarm you have to dock the lark and then turn off the alarm otherwise you lose your data. The thing that irks me most is the upsell within the app that analyzes your sleep pattern. A great concept although after you use your one free session then you have to pay an outrageous monthly fee to get more sessions. No possibility to pay as you go sessions every once in a while.

derekbaker ,

As an alarm clock, nearly perfect

I needed something that would wake me reliably but not disturb my husband. This -- the wristband plus the app -- is pretty much perfect for that. Any issues with Bluetooth pairing I've been able to resolve (they're infrequent, but annoying when they occur; fortunately, as the device is designed, they're discovered at bedtime and not after-the-fact). The one serious problem I had after an app update, customer service was able to help me fix via email. The wristband vibrates enough to wake me (I still set a soft back-up alarm gong across the room for 10 minutes later; I know me) without waking my husband. My one improvement to the app would be to allow me to estimate/add manually any additional sleep I get if I doze off on the couch, for a nap, etc. As it is, thi, "History" gives me a good, uh, wake-up call that I'm playing fast and loose with regular bedtimes and helps me keep a healthy night's sleep a priority ... or at least an (un)conscious goal.

SOCarro ,

Lark Up

The concept for this sleep tracker is not bad, but the execution is poor. To all appearances, the platform is not even being supported anymore. There have been no app updates since 2012; the developer website customer support also shows no interaction since 2012. The most useful function is the vibrating alarm, but it fails to work or fails to set because of pairing or other software issues far too often. It is very frustrating to have to spend 20 minutes, when you should be asleep, setting your alarm. I have submitted multiple service requests, none of which have received any reply. I rate this as high as one star only because I think that with decent tech support it could be a good device. I am hoping for a Vivosmart or Up3 for Christmas, after which I will be tossing the Lark. I have had it less than three months, but cannot put up with the poor reliability and poor interface any longer. If I had not received it as a gift, and had any idea where it was purchased, I would have returned it within the first month.

App Privacy

The developer, LARK, has not provided details about its privacy practices and handling of data to Apple. For more information, see the developer's privacy policy.

No Details Provided

The developer will be required to provide privacy details when they submit their next app update.


Lark Technologies, Inc
16.5 MB

Requires iOS 4.2.6 or later. Compatible with iPhone, iPad, and iPod touch.


English, French, German, Italian, Japanese, Simplified Chinese, Spanish, Traditional Chinese

Age Rating


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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