# Sun Day Tracker vs PeptideTrax

The clearest difference is in-app purchases: Sun Day Tracker at none against PeptideTrax's 2. PeptideTrax's advantage is update cadence (every 9 days vs monthly). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. PeptideTrax sells 2 in-app purchases, starting at $0.99 per month. Sun Day Tracker asks for nothing beyond the download.

Sun Day Tracker ships an update monthly, PeptideTrax every 9 days. The most recent releases landed on October 21, 2026 and September 29, 2026 respectively.

## The numbers

| Metric | Sun Day Tracker | PeptideTrax |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (28 ratings)](https://appshunter.io/ios/app/sun-day-tracker/id6748545544/reviews)** | — |
| Number of ratings | **28** | — |
| Positive reviews | 83.3% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Every 9 days** |
| Monetization | Free | — |
| Size | 1 MB | 3 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 17+ |
| Developer | [permissionless tech, llc](https://appshunter.io/developer/1824145893) | [ConsultUtah LLC](https://appshunter.io/developer/388887964) |

## What reviewers say

### Sun Day Tracker

[App page](https://appshunter.io/ios/app/sun-day-tracker/id6748545544)

Monitor your daily vitamin D absorption from sunlight exposure. This straightforward application helps you keep track of your sun-related vitamin D intake.

**Highlights:** Track daily vitamin D intake, Sunlight exposure monitoring, Simple interface, Daily tracking

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

**In-app purchases:** none


### PeptideTrax

[App page](https://appshunter.io/ios/app/peptidetrax/id6765981714)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Premium | $0.99 | per month |
| Yearly Premium | $9.99 | per year |


## Frequently asked questions

### Is Sun Day Tracker free?

Sun Day Tracker is free to download, with no in-app purchases.

### Is PeptideTrax free?

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

### Do Sun Day Tracker or PeptideTrax have ads?

Neither Sun Day Tracker nor PeptideTrax shows ads.

### Which is updated more often, Sun Day Tracker or PeptideTrax?

Sun Day Tracker ships an update monthly, and PeptideTrax every 9 days. Most recently, Sun Day Tracker was updated on October 21, 2026 and PeptideTrax on September 29, 2026.

---

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