Comparison

Timeshifter vs Flykitt

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Timeshifter

This app provides personalized plans to combat jet lag based on circadian science. It offers practical advice for light exposure and avoidance to help you adjust to new time zones quickly and reduce symptoms like insomnia and sleepiness.

Highlights
  • Personalized jet lag plans
  • Circadian Time™ advice
  • Practicality Filter™
  • Pre-travel adjustment advice
  • Push notifications for advice
  • Automatic detection of short trips
Features
Currently charting
Read full description

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

About

Flykitt

This AI-powered travel companion offers personalized recommendations for sleep, jet lag, workouts, and healthy eating. It analyzes your preferences and available resources to provide tailored advice for business and leisure travelers.

Highlights
  • Personalized sleep and jet lag advice
  • AI-driven workout generation
  • Healthy restaurant and menu analysis
  • Customized meal recommendations
  • Travel fitness optimization
Features
Read full description

Developed based on research with Navy SEALs and fighter pilots, loved by pro sports teams, and optimized for business and leisure travelers, Flykitt's healthy-travel AI leverages unique insights across sleep, inflammation, workout optimization, and even commercial food preparation to provide the most tailored and effective recommendations in the world for sleep, jet lag, travel workouts, and finding healthy food on the road. Foodie – Smart Restaurant Choices Eat healthier when you travel. Just upload a restaurant name or menu, and Foodie will analyze your options based on your taste profile and suggest the healthiest picks personalized just for you. Fit – On Demand Gym Workouts Traveling with limited time or unfamiliar equipment? Take a picture of a gym setup and Fit will generate a customized workout using what's available. Contact Us: flykitt.com/pages/contact Terms of Service: flykitt.com/pages/terms-conditions Privacy Policy: flykitt.com/pages/privacy

Screenshots

Timeshifter4 screens
Flykitt4 screens

Verdict

The call

Timeshifter and Flykitt both sit at 4.7 stars, but that hides the real split: 92% of Timeshifter's written reviews are positive against 77% of Flykitt's. Timeshifter also leads on ratings volume (2.7K vs 242) and chart position (#28 vs unranked). Flykitt's advantage is iOS requirement (15.1 vs 17.0). On price, rating, update cadence and ads there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Timeshifter sells 3 in-app purchases, starting at $24.99 per year and Flykitt sells 4 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.7 for Timeshifter against 4.8 for Flykitt. That said, the two scores are not equally well evidenced: Timeshifter has 2.7K ratings behind it against 242, so its average is the more settled of the two. Written reviews are what separate them: 92% of Timeshifter's written reviews are positive against 77% of Flykitt's.

UpkeepUpdate frequency

Timeshifter ships an update every 8 days, Flykitt weekly. The most recent releases landed on October 19, 2026 and October 18, 2026 respectively.

Scorecard4 real differences · 7 level
Timeshifter versus Flykitt: the parameters behind the verdict, then further details
ParameterTimeshifterFlykitt
PriceFreeFree
Rating4.7 (2.7K ratings)4.8 (242 ratings) — better
Positive reviews91.8% of reviews — better76.9% of reviews
Number of ratings2.7K — better242
Update frequencyEvery 8 daysWeekly — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
Best chart rank#28 — better—
DevicesiPhoneiPhone, iPod — better
Requires iOS17.015.1 — better
Further details — not scored
Size62 MB56 MB
Age rating17+17+
DeveloperTimeshifter Inc.Kitt Bio Inc.

Customer experience

Timeshifter

All ratings2,662 ratings
Positive90.8%
Neutral2.1%
Negative7.1%
Written reviews1,482 reviews
Positive91.8%
Neutral1.6%
Negative6.5%

Flykitt

All ratings242 ratings
Positive93.0%
Neutral2.1%
Negative5.0%
Written reviews26 reviews
Positive76.9%
Neutral11.5%
Negative11.5%

User reviews

Timeshifter

From 2.7K App Store ratings

What we love

  • 👍 Easy to use
  • 🚀 Effective at reducing jet lag
  • 💡 Personalized recommendations
  • ⏱️ Helpful notifications
  • 🔍 Explains the science behind the recommendations

Room to improve

  • 🕰️ Difficult to follow recommendations during travel
  • 🤒 Melatonin not always readily available
  • 💰 Expensive subscription model

Flykitt

From 242 App Store ratings

What we love

  • ✨ Solves jet lag effectively
  • 🚀 Efficient travel recovery
  • 💡 Brilliant app integration
  • 👍 Easy to follow instructions
  • 🔬 Scientific approach to travel

Room to improve

  • bulky Packaging
  • 📱 App requires internet
  • 💰 Expensive for some users
  • 📅 Scheduling issues with delays
  • ❌ No offline functionality

Bugs and requests

Timeshifter

Reported bugs

2 issues
  • App crashing or getting stuck on a white screen
  • Issues with account login and data loss

Requested features

3 requests
  • Ability to adjust plan for unexpected schedule changes
  • Integration with fitness trackers or sleep apps
  • Recommendations for meal timing and nutrition

Flykitt

Reported bugs

3 issues
  • App requires internet connection
  • Error creating account ('notinternetconnection')
  • Scheduling errors with flight delays

Requested features

6 requests
  • Allow for last-minute schedule changes
  • Add events to iCalendar
  • Display both time zones on calendar/todo list
  • Option to reorder via the app
  • Add diet reminders back
Show 1 more
  • Show percentage of completion

In-app purchases

3 purchases

Timeshifter

Subscriptions1
  • Timeshifter$24.991 Year
One-time2
  • discounted jet lag plan$4.99
  • jet lag plan$9.99
4 purchases

Flykitt

Subscriptions4
  • Flykitt Pro Light Monthly$4.991 Month
  • Flykitt Pro Monthly$12.991 Month
  • Flykitt Pro Light Yearly$49.991 Year
Show 1 more
  • Flykitt Pro Yearly$119.991 Year

Questions

Is Timeshifter free?
Timeshifter is free to download, with in-app purchases available.
Is Flykitt free?
Flykitt is free to download, with in-app purchases available.
Which has better reviews, Timeshifter or Flykitt?
Flykitt is rated higher. Timeshifter averages 4.7 out of 5 from 2.7K ratings, while Flykitt averages 4.8 from 242 ratings.
Do Timeshifter or Flykitt have ads?
Neither Timeshifter nor Flykitt shows ads.
Which is updated more often, Timeshifter or Flykitt?
Timeshifter ships an update every 8 days, and Flykitt weekly. Most recently, Timeshifter was updated on October 19, 2026 and Flykitt on October 18, 2026.

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