The idea behind this application is that it will help you track and manage your Vitamin D.

This new version integrates with the Apple Health app to make seamless data exchange possible in the following ways:

* on setup, profile information is fetched from the Health App if the user allows it
* the user's weight (a factor in D generation) is fetched on an ongoing basis, making it unnecessary to update it
* the app will write vitamin D doses, including session information into the Health app

You setup basic information one time, like your height and weight and skin type and then any time you are outside, during the prescribed hours (and parts of the year), you can have it compute the amount of D you are getting in a stopwatch interface. It will also track how long you can stay out and warn you when the time is up.

The application will notify you with the next opportunity to generate vitamin D.

Each day, you can see forecasts based on your location, and you can also see the solar position, your generated vitamin D vs. target etc.

In the Pro version, you can see your exposures' history and you will be able to schedule future events for next exposures.

What’s New

Version 9.8.0

Extension of free upgrade during Pandemic period

Ratings and Reviews

4.2 out of 5
470 Ratings

470 Ratings

Roxie_78 ,

Good, but could be better!

This app is extremely helpful in tracking Vitamin D levels. I love using the timer feature when I am out in the sun. It’s nice to be able to set the timer and be alerted when I’ve reached the maximum time for a safe level of sun exposure. It’s also nice that the amount of D received while being exposed to the sun is automatically calculated.

However, it would be nice if the app allowed a weekly dose of Vitamin D to be added, but it only allows daily doses. Therefore, I have to average out my dose to fit the app’s parameters. Other than that, I don’t have any complaints!

world-shaker ,

A lot of problems here

UPDATE: Don’t bother reaching out to the developer. When I made them aware of the issue on Twitter, with a supporting video/screencast of the issues below, they were rude and dismissive. I’m disappointed they couldn’t be bothered to take these issues seriously, and that they’d pass the blame on to me despite video evidence that their app has two serious bugs that disrupt a user’s ability to use it at even a basic level.

First, it’s defaulting my location to Saudi Arabia, though I’m in North Carolina. When I try to add my location, the map feature fails to find an address. Even when I manually enter my specific city, state, and country, it insists I enter the specific latitude and longitude of my location, which is incredibly bizarre. Never has an app asked me to manually enter my latitude and longitude. When I try to cancel the process of adding a new location, the app won’t allow me to return to its home screen. I had to force quit the app and reopen it to do so. I’m not sure how functional this app will be if I can’t even enter my proper location, and it’s suggesting sun times for a country halfway around the world.

Developer Response ,

You don't have to enter your location, the app gets it automatically. If you turn that on you will see that. That's why no one else is complaining about this.

pameliasue ,

A useful app that could use some polish.

I like this app and the ability to track my vit D. I live in the Pacific Northwest where supplementation is a must. I paid for the in-app upgrade and having the extra information is helpful but I’m not sure it was worth it. One thing I would like to see is improved background images and the ability to choose my own and I believe adding them as part of the paid upgrade package feature would be reasonable. In fact, I suspect your app would sell more upgrades if the upgrade included some personalized options. The current blue sky with clouds is ugly. It is all stretched out and distorted on my screen. I have the beautiful new iPhone XS Max and let’s face it, people prefer visually appealing apps. If you’re not willing to supply more options then allowing the user to upload their own background image would be appreciated.
Aside from the amateurish unfinished look, this app is great. With improved visual options/look included with the paid upgrade this app would be 5 star.

App Privacy

The developer, ontometrics, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Collected

The developer does not collect any data from this app.

Privacy practices may vary, for example, based on the features you use or your age. Learn More


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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