Timeshifter Jet Lag

4.3
1.84K reviews
Content rating
Rated for 3+
100K+
Downloads
Content rating
Rated for 3+
Digital Purchases
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About this app

Make jet lag history with science-based and highly personalized jet lag plans. Trusted by more than 1.7 million travelers and rated "as good as it's going to get" by The New York Times.

• The Wall Street Journal: "Indispensable"
• Condé Nast Traveler: "Say goodbye to jet lag"
• WIRED: "Will help reset your [circadian] clock"
• Travel + Leisure: "Game-changer"

PROVEN RESULTS
Timeshifter is used by astronauts, Formula 1 drivers, NBA players, and Olympic athletes.

Based on ~130,000 post-flight surveys:
✓ 96.4% of travelers who followed the advice avoided severe jet lag entirely.
✓ Travelers who ignored the advice were 6.2x more likely to experience severe jet lag – and 14.1x more likely to experience very severe jet lag.

YOUR FIRST PLAN IS FREE
Your first jet lag plan is free – no commitment is required! After your free plan, you can choose to purchase plans as-you-go or subscribe for unlimited plans.

KEY FEATURES
✓ Circadian Time™: Advice is based on your body's clock
✓ Practicality Filter™: Adjusts advice to the "real world"
✓ Quick Turnaround®: Automatically detects short trips
✓ Pre-travel advice: Start adjusting before departure
✓ Push notifications: View advice without opening the app

JET LAG MYTHS VS. CIRCADIAN SCIENCE
• Misleading advice on conquering jet lag – often promoted by non-experts or companies lacking real circadian science expertise – not only fails to help travelers but can make jet lag symptoms worse and may even cause harm.
• Jet lag CANNOT be fixed with generic sleep advice, exercise, hydration, dietary supplements, special diets, or fasting. None of these approaches will reset a traveler’s central circadian clock quickly to new time zones.
• Light is the key time cue to “reset” our circadian clocks, so the correct timing of light exposure and light avoidance, based on the traveler’s chronotype, normal sleep pattern and itinerary, is the only way to adjust to new time zones quickly. If the traveler’s timing is wrong, it will make their jet lag worse.

WHY WE MADE TIMESHIFTER
Getting the timing right is both complex and unintuitive. We created Timeshifter to make circadian science accessible and help you apply it to conquer jet lag.

Timeshifter helps you tackle both the underlying cause of jet lag – the disruption of your circadian clock – as well as reduce the disruptive symptoms, such as insomnia, sleepiness and digestive discomfort.

Timeshifter was developed with Dr. Steven W. Lockley. A Harvard Medical School faculty member for over 20 years and former Neuroscientist at Brigham and Women's Hospital, he is an international authority on circadian rhythms and sleep with nearly 30 years of research experience. Dr. Lockley helps NASA astronauts and mission controllers, Formula 1 drivers, NBA players, and Olympic athletes perform at their best.

Download Timeshifter and make jet lag history on your next flight.

These statements have not been evaluated by the Food and Drug Administration. Timeshifter is not intended to diagnose, treat, cure or prevent any disease, and is intended for healthy adults, 18 years of age or older. Timeshifter is not intended for pilots and flight crew on duty.

Terms of Use:
www.timeshifter.com/legal/terms-of-use

Privacy Policy:
www.timeshifter.com/legal/privacy-policy
Updated on
Jun 18, 2026

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
No data shared with third parties
Learn more about how developers declare sharing
No data collected
Learn more about how developers declare collection
Data is encrypted in transit
You can request that data be deleted

Ratings and reviews

4.3
1.81K reviews
Heidi
July 5, 2025
I used it for my flight from the East Coast of the US to Europe last month. I experienced no jet lag at all. Incredible! The first two days overseas are usually such a bummer, dragging yourself around trying not to fall asleep, feeling tired all the time. It wasn't like that this time. I highly recommend this app. Even if you can't stick to it completely, follow it as much as you can. It works!
19 people found this review helpful
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Ruth O Shaughnessy
June 15, 2026
I've used this app for two longhaul flights - once from Ireland to New Zealand, and one from Ireland to Costa Rica. I had zero jet lag both times, in both directions. It's absolutely miraculous. I've been banging on about it to anyone who will listen since. For both trips, I stuck as closely to the recommendations as practically possible - it's genuinely not as difficult as it might look. I'll never fly longhaul without Timeshifter again.
1 person found this review helpful
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Mike Bigelow
June 12, 2026
It's mostly impractical advice for my many US to Japan flights regardless of the time of day. Sometimes it wants me to sleep at the beginning and end of the flight (during meal services, when it's louder, lit, and seatbacks should be upright) and be awake with bright light in the middle (when the cabin is dark because everyone else is sleeping). Other times, it wants me to sleep 6 hours in the early afternoon after a full night's rest. App doesn't support those of us who sleep less than 7 hours.
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Timeshifter Inc.
June 15, 2026
To avoid jet lag you will have to do things differently that you normally do. If you are not able to sleep when we ask you to, do your best to avoid light (wear a sleep mask or dark sunglasses). We know it's hard for most people to sleep on flights and take that into account. You can get bright light from your phone or tablet screen.

What’s new

We release updates regularly, and we're always looking for ways to make the experience better.
Let's dive into the enhancements you'll find in our latest update:

## Fixed
- Issue with help articles loading too slow in the support chat.

If you have any feedback, or run into issues, please use the live chat in the app. We love to talk.