Timeshifter® Jet Lag

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1.95K reviews
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PEGI 3
100K+
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About this app

Reduce jet lag with personalized plans based on the latest sleep and circadian science. Timeshifter creates a plan for every flight and time zone, tailored to your chronotype, sleep pattern, itinerary and personal preferences.

Used by NASA astronauts, F1 teams, NBA players, Olympic athletes and frequent 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"

WHAT YOU GET
Jet lag plans that show exactly when to seek light, when to avoid it, when to sleep and when to nap, and how to use melatonin (optional) and caffeine correctly (optional) - hour by hour.

PROVEN RESULTS
Based on ~130,000 post-flight surveys:
- 96.4% of travelers who followed their plan 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, with no commitment. After your free plan, you can buy plans as you go for US$9.99 per plan, or subscribe for unlimited plans at US$24.99.

KEY FEATURES
- Circadian Time™: advice timed to your circadian 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
Jet lag cannot be fixed with generic sleep advice, exercise, hydration, dietary supplements, special diets or fasting. None of these reset your circadian clock quickly to a new time zone.

Light is the key time cue that resets your circadian clock. Individually-timed light exposure and light avoidance - based on your chronotype, your normal sleep pattern and your itinerary - is the only way to adjust to a new time zone quickly. Get the timing wrong and jet lag gets worse.

Getting that timing right is complex and unintuitive, which is why generic advice fails. Timeshifter works as your jet lag calculator and planner, doing that timing for you.

WHY WE MADE TIMESHIFTER
We built Timeshifter to make circadian science accessible and help you apply it to reduce jet lag. It targets the underlying cause of jet lag - the disruption of your circadian clock - and reduces the symptoms that come with it, including insomnia, daytime sleepiness, fatigue 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 more than 30 years of clinical research experience in humans, and works with NASA astronauts and mission controllers, F1 teams, NBA players, national soccer teams and Olympic athletes.

Whether you are crossing one time zone or ten, on a long-haul flight or a quick turnaround, Timeshifter gives you a jet lag plan built for that trip.

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
Reduce jet lag with personalized plans based on sleep and circadian science.
Updated on
Oct 23, 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

1.93K reviews
Katharine Murray
August 10, 2026
I used this app when travelling to New Zealand and I felt fantastic. The shift started a few days before, advising me of when to go to bed, when to use caffeine and more importantly when to avoid it. I landed late in the evening but woke up refreshed and ready for my adventure the following morning. I thoroughly recommend using this app for all your travels.
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Lisa Barry
June 4, 2026
I used this app on a multi-leg journey from the UK to Japan. It really worked for me! Slight jet lag, but no where near as bad as usual. I was able to go back to work straight away after returning home with no adverse effects. The only reason I haven't given it 5 stars is because, for people like me, who only travel once each year, a yearly subscription isn't worth it. I'd like to be able to purchase a one off plan as and when I need it.
3 people found this review helpful
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Timeshifter Inc.
June 4, 2026
Hi Lisa. Thank you for your kind words. And you actually can pay per use. When you tap the add flight button you will be able to purchase a single trip plan or subscription :-)
Ivan Kowalski
June 12, 2026
If I follow the instructions of the app it would certainly be successful in ensuring I don't suffer from any jetlag, because I would miss my flight! In reply to the response: You have me mixed up with someone else. I had a 9hr flight to Canada. the app recommended I slept until 10am on the day of the flight. if I had done so I would have missed my flight.
2 people found this review helpful
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Timeshifter Inc.
June 11, 2026
Hi Ivan, Our advice is rounded to the nearest hour to make it easy to read and remember. I believe we already discussed this in support. You have a 1-hour flight and you should try to nap or avoid light during the flight. If you look at your advice you will see that the nap is shown along with the flight.

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
- Overall design and performance improvements

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