VIVO FREE Entrain version1.2 APK Download for ZTE


  • Oct. 6, 2014
  • 20
Jetlag is the result of a disrupted circadian clock. Entrain simulates your circadian clock on the phone and makes mathematically optimal lighting recommendations to help you adjust as fast as possible to new timezones and schedules. The recommendations, which tell you when to seek light and/or dark, are based on new research in the journal PLoS Computational Biology. Learn more at

The University of Michigan part of our Travel & Local and have average installs from 10000 to 50000. Last Update Oct. 6, 2014. ZTE rating is 62.5287. Current verison is for VIVO 1.2. Actual size 11.0 MB.

What's new

    Bug fixes: Fixed non-updating label and light schedule itinerary display.
Download entrain.apk 11.0 MB


Jon Pike at April 16, 2015

Does not work I've read the jet lag research that this app is based upon, and I am really keen to see this app succeed, but it doesn't ... It is awkward to use and cannot provide any pre-travel recommendations. Most importantly, the advice it gives is obviously faulty. Have the developers tested the app outside of a limited set of US timezone scenarios?

John Morgan at Oct. 3, 2014

Great concept well executed. I look forward to using it on my next trip. A few niggles I have already come across: when viewing the schedule it defaults to Detroit time for some reason. Surely it should show local time for before the trip starts and new time zone for after the trip starts. A monthly calendar view would be nice for setting trip details. Date ordering other than US month/day/year would be a useful option.

Brian Good at Oct. 3, 2014

Great idea This app is a great idea and I am happy to see it on Android. I look forward to using it on future trips.

Becky Hoai at Oct. 3, 2014

Easy to use I like that the learning curve to use this app is not steep at all. The interface is simple but pleasant to look at, and it's pretty fun dragging my lighting history to update it... but maybe I am just easily amused. In any case, the optimal schedule it gave me to shift my sleep cycle back a few hours worked surprisingly well! (I stayed in the same timezone IRL but told the app I was traveling to Anchorage.)

Andrew Phillips at Sept. 30, 2014

Wonderful app, great to see it on Android!

Kelempiau Kelasi at May 11, 2015

Potential but poor ui So confusing I couldn't follow what it was recommending... Needs to be way more intuitive.

John Edward at May 6, 2015

Sucked Did not work in android

Austin Carter at June 17, 2015

Gave me incorrect schedule Was really hoping that this would work but the schedule that it keeps giving me makes no sense. It's telling me to wake up at midnight and go to bed at 8 am when I'm only shifting four hours (going backwards). :(

esen tivo at June 1, 2015

Excellent New ideas are pioneering.

Christoph Danger at Oct. 16, 2015

Scientists Never let scientists design an app. the user experience will be horrible. Choose a user friendly alternative.

Bill Maul at Oct. 2, 2015

Totally impractical For a trip to Oz from UK it shows going to full light at 2am on first day of adjustment which is totally impractical for trying to maintain normal life before trip. While in theory it may work, just unusable

Justin Booth at Aug. 20, 2015

Makes no sense Hoped this would be helpful but the recommended light / dark schedule is completely impractical

O GK at Feb. 24, 2016

12 hr day only Only 12 hrs in a day

David Zhu at Aug. 22, 2015

Basically Useless, a waste of my time So the advice for adjusting a 12 hour time difference ahead of time is to be exposed to light from midnight to 9am. Tell me sth that I don't already know.

John Putnam at May 7, 2016

Can't set my location. I'm in Tucson, always MST. Closest city listed is Phoenix, but time zone given is MST. Arizona is always on MST. Tucson is not an option.

Celia Harris Soriano at May 7, 2016

Needs a good designer Try making it easier to use, that's the key for success. (You should fell embarrassed that a child can design an app better than you can)

Thomas Ta at July 17, 2016

Not every one is a PhD scientist in circadian rhythms More explanations about the "typical amount of light exposure" would be nice to know before I make the selection that fits my situation. We can't just assume what it means. You don't even have it in your FAQ.

Jack DeBear at May 27, 2016

Unusable Could not be more oblique.

J. Edward at May 20, 2016

Just doesnt work. 11 hour difference, tells me to shift light by 2 minutes one day then 30 minutes back the next, then jump 7 hours the last day. Nonsense.

at Aug. 30, 2016

Needs a simpler and less ambiguous ui

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