# RayDay vs Body Language

The clearest difference is in-app purchases: Body Language at none against RayDay's 3. Body Language also leads on iOS requirement (15.0 vs 17.0). On price, update cadence, ads 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. Body Language asks for nothing beyond the download.

Both ship on a similar rhythm, roughly every 3 weeks. The most recent releases landed on October 31, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | RayDay | Body Language |
| --- | --- | --- |
| 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 | No |
| Update frequency | Every 3 weeks | Every 3 weeks |
| Monetization | Freemium | — |
| Size | 26 MB | 41 MB |
| Requires iOS | 17.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Jakub Laszczyk](https://appshunter.io/developer/568719342) | [LogiFit](https://appshunter.io/developer/687776450) |

## 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 |


### Body Language

[App page](https://appshunter.io/ios/app/body-language/id6768946601)

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

**In-app purchases:** none


## Frequently asked questions

### Is RayDay free?

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

### Is Body Language free?

Body Language is free to download, with no in-app purchases.

### Do RayDay or Body Language have ads?

Neither RayDay nor Body Language shows ads.

### Which is updated more often, RayDay or Body Language?

RayDay ships an update every 3 weeks, and Body Language every 3 weeks. Most recently, RayDay was updated on October 31, 2026 and Body Language 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.*