Timeshifter vs Space/Time
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- Personalized jet lag plans
- Circadian Time™ advice
- Practicality Filter™
- Pre-travel adjustment advice
- Push notifications for advice
- Automatic detection of short trips
Read full descriptionHide 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
Space/Time
Discover travel overlaps with friends and see who's in town. Connect with friends to find shared travel dates and explore city connections. Get notified about friends visiting or when your plans align.
- Find and connect with friends
- Enter travel dates for instant matches
- Search cities for residents and visitors
- Get notified of overlapping plans
- See who is in town
Read full descriptionHide full description
A travel app for you and your friends. Never miss a friend who's in tow, and know when your travel plans overlap. - Find your friends and connect to them - Enter travel dates, and get instant matches from your friends - Search by city and see who lives there, who has been there (both really valuable for getting good recs) and for who goes there. - Get notified when someone is in town, or you have overlapping plans
Screenshots
Verdict
The clearest difference is in-app purchases: Space/Time at none against Timeshifter's 3. Space/Time also leads on rating (5.0 vs 4.7) and update cadence (daily vs weekly). Timeshifter's advantage is ratings volume (2.7K vs 1) and chart position (#32 vs unranked). On price, ads and device support 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
Both are free to download. Timeshifter sells 3 in-app purchases, starting at $24.99 per year. Space/Time asks for nothing beyond the download.
Space/Time holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: Timeshifter has 2.7K ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 92% of Timeshifter's written reviews are positive against 100% of Space/Time's.
Timeshifter ships an update weekly, Space/Time daily. The most recent releases landed on October 24, 2026 and October 16, 2026 respectively.
| Parameter | Timeshifter | Space/Time |
|---|---|---|
| Price | Free | Free |
| Rating | 4.7 (2.7K ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 91.8% of reviews | 100.0% of reviews — better |
| Number of ratings | 2.7K — better | 1 |
| Update frequency | Weekly | Daily — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Best chart rank | #32 — better | — |
| Devices | iPhone | iPhone, iPod — better |
| Requires iOS | 17.0 | 13.4 — better |
| Further details — not scored | ||
| Size | 62 MB | 40 MB |
| Age rating | 17+ | 4+ |
| Developer | Timeshifter Inc. | WorldBrain.io |
Customer experience
Timeshifter
Space/Time
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
Space/Time
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Timeshifter
- Timeshifter$24.991 Year
- discounted jet lag plan$4.99
- jet lag plan$9.99
Space/Time
No in-app purchases
Questions
Is Timeshifter free?
Is Space/Time free?
Which has better reviews, Timeshifter or Space/Time?
Do Timeshifter or Space/Time have ads?
Which is updated more often, Timeshifter or Space/Time?
Other comparisons















