# RayDay vs Sunshine D3

The clearest difference is in-app purchases: Sunshine D3 at none against RayDay's 3. Sunshine D3 also leads on iOS requirement (15.0 vs 17.0). RayDay's advantage is ads (none vs shown) and update cadence (every 3 weeks vs every 2 months). On price and device support there is nothing between them.

Both are free to download. RayDay sells 3 in-app purchases, starting at $4.99 per 7 days. Sunshine D3 asks for nothing beyond the download.

RayDay ships an update every 3 weeks, Sunshine D3 every 2 months. The most recent releases landed on October 31, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | RayDay | Sunshine D3 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.0 (2 ratings)](https://appshunter.io/ios/app/rayday-vitamin-d-tracker/id6761286896/reviews)** | — |
| Number of ratings | **2** | — |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | **Every 3 weeks** | Every 2 months |
| Monetization | Freemium | — |
| Size | 26 MB | 9 MB |
| Requires iOS | 17.0 | **15.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Jakub Laszczyk](https://appshunter.io/developer/568719342) | [Ihsan Gercelman](https://appshunter.io/developer/1895469057) |

## What reviewers say

### RayDay

[App page](https://appshunter.io/ios/app/rayday-vitamin-d-tracker/id6761286896)

This app helps you understand your daily window for natural Vitamin D production. It calculates optimal sun exposure times based on your location and skin type, providing forecasts and real-time atmospheric data.

**Highlights:** D-Window Calculator, Live Solar Path animation, 7-Day D-Window Forecast, Skin Type Personalization, Smart Notifications, Real-time Atmospheric Data, Home Screen Widget

**Features:** macOS Compatibility, Vision Pro support, iPhone Duo support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| RayDay Weekly | $4.99 | per 7 days |
| RayDay Yearly | $24.99 | per year |
| Early Supporter Yearly | $24.99 | per year |


### Sunshine D3

[App page](https://appshunter.io/ios/app/sunshine-d3/id6766470179)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is RayDay free?

RayDay is free to download, with in-app purchases available.

### Is Sunshine D3 free?

Sunshine D3 is free to download, with no in-app purchases.

### Do RayDay or Sunshine D3 have ads?

Sunshine D3 shows ads; RayDay does not.

### Which is updated more often, RayDay or Sunshine D3?

RayDay ships an update every 3 weeks, and Sunshine D3 every 2 months. Most recently, RayDay was updated on October 31, 2026 and Sunshine D3 on October 28, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*