---
title: "RayDay: Vitamin D Tracker - Reviews, Revenue and Downloads in Canada | Apple App Store"
description: "I built RayDay after years of working indoors left me Vitamin D deficient. The fix wasn't another bottle of pills. It was knowing exactly when the sun was high enough so my body could make Vitamin D t"
---

# RayDay: Vitamin D Tracker — Canada
> Less Pills, More Sunshine

![RayDay App Icon](https://is1-ssl.mzstatic.com/image/thumb/Purple221/v4/6a/89/18/6a8918dc-8684-8129-fb77-048e7c20df3f/AppIcon-0-0-1x_U007epad-0-1-85-220.png/434x0w.png)

**Developer:** [Jakub Laszczyk](https://apptail.io/developer/jakub-laszczyk-IaYzCb)
**Category:** Health Fitness
**Rating:** 4.6/5 (5 ratings)
**Price:** Free
**Bundle ID:** com.jayclub.rayday
**Store:** Apple App Store
**Country:** Canada
**Version:** 1.4.0 (released 2026-09-25)
**Original Release:** 2026-04-03
**Languages:** Polish, English, Arabic, Chinese, Croatian, Czech, Danish, Finnish, French, Greek (modern), Hebrew (modern), Hindi, Spanish, Indonesian, Japanese, Catalan, Korean, Malay, Dutch, German, Norwegian Bokmål, Portuguese, Russian, Romanian, Swedish, Slovak, Thai, Turkish, Ukrainian, Vietnamese, Hungarian, Italian

**App Store Link:** [Download on Apple App Store](https://apps.apple.com/ca/app/app/id6761286896)
**AppTail Page:** [https://apptail.io/app/rayday-vitamin-d-tracker-IXjz/canada](https://apptail.io/app/rayday-vitamin-d-tracker-IXjz/canada)

## RayDay Description
I built RayDay after years of working indoors left me Vitamin D deficient. The fix wasn't another bottle of pills. It was knowing exactly when the sun was high enough so my body could make Vitamin D the way it always has: naturally, on its own. That's all RayDay does: it tells you your daily sun window, personalized to where you live and your skin type, so you can get Vitamin D the way your body was built to.

FEATURES:

• D-Window Calculator: know exactly when Vitamin D production is possible today and tomorrow
• Live Solar Path: a beautiful animated arc showing the sun's position, sunrise, sunset, and the highlighted D-Window
• 7-Day Forecast: see your D-Window for the coming week
• Skin Type Personalization: your Fitzpatrick type determines how fast you make Vitamin D
• Smart Notifications: get alerted before optimal sun days, plus a heads-up when winter's first D-Window returns
• Atmospheric Data: real-time UV index, cloud cover, humidity, and altitude
• Phase-Aware Design: app colors shift with the time of day. Dawn, daytime, sunset, and night
• Home Screen Widget: a quick glance at your D-Window status
• Works Worldwide: accurate for any latitude, including polar regions

HOW IT WORKS:

RayDay uses NOAA solar position algorithms to calculate the sun's altitude throughout the day. When the sun crosses 35° above the horizon, UVB rays penetrate the atmosphere. That's your D-Window for Vitamin D synthesis.

The app factors in your Fitzpatrick skin type to recommend exposure durations that hit your daily IU goal without overexposure.

Some features require a paid subscription.

DISCLAIMER: RayDay is for educational purposes only. Consult a healthcare professional before changing Vitamin D supplementation or sun exposure habits.

---

LEGAL:
Privacy Policy: 
Terms of Use (EULA): 

SUPPORT:
support@jakubl.com
X: @jakublaszczyk

## RayDay Screenshots
- [Screenshot 1](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/5c/95/8f/5c958fcc-a7e6-3572-afb1-1d14bc84b53c/01-find-your-d-window.jpg/1290x2796.png)
- [Screenshot 2](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/70/f3/75/70f375f9-586e-b7a3-9320-752b16c5685e/02-track-vitamin-d-live.jpg/1290x2796.png)
- [Screenshot 3](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/49/3d/b7/493db71b-c801-d178-ee96-cce7351f2956/03-protect-your-skin.jpg/1290x2796.png)
- [Screenshot 4](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/b0/60/91/b06091d8-3e1b-7c4a-4034-3e467484e9cb/04-plan-your-week.jpg/1290x2796.png)
- [Screenshot 5](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/a3/50/82/a35082a3-6dec-f4e1-861a-9898158460fe/05-earn-sun-badges.jpg/1290x2796.png)

## RayDay Rating Breakdown in Canada
- 5 stars: 4 (80%)
- 4 stars: 0 (0%)
- 3 stars: 1 (20%)
- 2 stars: 0 (0%)
- 1 stars: 0 (0%)

## RayDay Reviews in Canada

### ***** "Never miss the best sun"
Great little app for knowing exactly when to step outside and soak up some vitamin D. No guessing, just good timing.
-- JD Aitken, 2026-05-25

[View all RayDay reviews and detailed analytics on AppTail](https://app.apptail.io/signup?utm_campaign=ai-crawl&utm_content=reviews)




## Apps Similar to RayDay
- [Tan Tracker - Suntan](https://apptail.io/app/tan-tracker-suntan-bMMv/canada)
- [SunLove - UV Index & Tanning](https://apptail.io/app/sunlove-uv-index-tanning-ZNAw/canada)
- [Sunlight & UV: Get Some Sun](https://apptail.io/app/sunlight-uv-get-some-sun-vDfx/canada)
- [Rays: Auto Vitamin D Tracking](https://apptail.io/app/rays-auto-vitamin-d-tracking-BLkx/canada)
- [SunMax: Vitamin D Tracker](https://apptail.io/app/sunmax-vitamin-d-tracker-ekJx/canada)
- [Vitamin D Sun Tracker - Bask](https://apptail.io/app/vitamin-d-sun-tracker-bask-PRty/canada)
- [Vitamin D Window Widget](https://apptail.io/app/vitamin-d-window-widget-QcGy/canada)
- [PausePulse: Breathing App](https://apptail.io/app/pausepulse-breathing-app-bDxz/canada)
- [Sky Dose: Vitamin D Tracker](https://apptail.io/app/sky-dose-vitamin-d-tracker-drtA/canada)

## RayDay Available In
- [Canada](https://apptail.io/app/rayday-vitamin-d-tracker-IXjz/canada)
- [Germany](https://apptail.io/app/rayday-vitamin-d-tracker-IXjz/germany)
- [Chile](https://apptail.io/app/rayday-vitamin-d-tracker-IXjz/chile)
- [Spain](https://apptail.io/app/rayday-vitamin-d-tracker-IXjz/spain)
- [Japan](https://apptail.io/app/rayday-vitamin-d-tracker-IXjz/japan)
- [Pakistan](https://apptail.io/app/rayday-vitamin-d-tracker-IXjz/pakistan)
- [Poland](https://apptail.io/app/rayday-vitamin-d-tracker-IXjz/poland)
- [Taiwan](https://apptail.io/app/rayday-vitamin-d-tracker-IXjz/taiwan)
- [Vietnam](https://apptail.io/app/rayday-vitamin-d-tracker-IXjz/vietnam)
- [Switzerland](https://apptail.io/app/rayday-vitamin-d-tracker-IXjz/switzerland)

---

## About AppTail

[AppTail](https://apptail.io) is a mobile app intelligence platform providing app analytics, ASO (App Store Optimization) tools, keyword tracking, competitor analysis, revenue estimates, and review monitoring for iOS App Store apps. Track your app's performance, discover ranking keywords, monitor competitors, and analyze market trends.

- [Search Apps](https://apptail.io)
- [Top Charts](https://apptail.io/top-iphone-apps)
- [Sign Up for Full Access](https://app.apptail.io/signup?utm_campaign=ai-crawl&utm_content=footer)

*Data provided by [AppTail](https://apptail.io) - Mobile App Intelligence Platform*