# @pcmag on Instagram

- **Type:** Image
- **Original URL:** https://www.instagram.com/p/DMJPLFDsMxp
- **Gondola URL:** https://gondola.cc/posts/32540306-pcmag-instagram
- **Thumbnail:** https://img.gondola.cc/tr:w-,h-,fo-auto/postThumbnails/2d89fa13f4.jpg
- **Posted:** 2025-07-15T21:57:13.000+00:00
- **Account Owner:** PCMag (@pcmag) — https://gondola.cc/pcmag

## Caption

Last week, Twitter co-founder and Square CEO, Jack Dorsey, introduced Bitchat, a peer-to-peer messaging app that operates via bluetooth. This week, he announced an iPhone app called Sun Day.

Sun Day is a relatively simple app where you press a button to say you’ve walked into sunlight to begin to track UV exposure. You’ll then press it again to end the session, and it’ll give you an estimate of how much Vitamin D you've gained in that period.

It uses your location’s UV index, cloud cover, and elements like sunrise or sunset times to calculate the amount absorbed. This app isn’t monitoring your actual phone’s intake of UV, so it won’t matter if the device is in your pocket.
Sun Day also allows you to specify your skin type with six different options, plus you can pick what outfit you’re wearing to give it an idea of how much of your skin is visible. The app will also tell you when you may burn, according to these factors, giving you an idea of when to seek some shade.

Sun Day is available for iPhone in beta through TestFlight. However, there's no clear sign of when it'll be ready for a full release, or whether the app will come to Android.

#sundayapp #iphone #jackdorsey #technews

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## Tags

technews, sundayapp, jackdorsey, iphone

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