# Shield 100SA vs Sun Nudge

The clearest difference is price: Shield 100SA at Free against Sun Nudge's $2.99. Shield 100SA also leads on iOS requirement (15.1 vs 18.0). Sun Nudge's advantage is update cadence (every 4 days vs every 10 days). On ads, in-app purchases and device support there is nothing between them.

Shield 100SA is free to download; Sun Nudge costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Shield 100SA ships an update every 10 days, Sun Nudge every 4 days. The most recent releases landed on September 30, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | Shield 100SA | Sun Nudge |
| --- | --- | --- |
| Price | **Free** | $2.99 |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/sun-nudge/id6781018933/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 10 days | **Every 4 days** |
| Monetization | — | Paid |
| Size | 35 MB | 29 MB |
| Requires iOS | **15.1** | 18.0 |
| Devices | iPhone, iPod | iPhone, Apple Watch |
| Age rating | 17+ | 17+ |
| Developer | [100 Club of San Antonio](https://appshunter.io/developer/1558751469) | [Dustin Rodriguez](https://appshunter.io/developer/1782822037) |

## What reviewers say

### Shield 100SA

[App page](https://appshunter.io/ios/app/shield-100sa/id6740347706)

**Features:** macOS Compatibility

**In-app purchases:** none


### Sun Nudge

[App page](https://appshunter.io/ios/app/sun-nudge/id6781018933)

This app gently reminds you to get natural daylight exposure daily. It integrates with Apple Health to track your time in daylight and offers features like 'sun walks' and sun safety nudges. Enjoy a calm, privacy-focused experience with no ads or accounts required.

**Highlights:** Daily daylight reminders, Sun walk tracking, Sunscreen logging, UV and golden hour alerts, Home and Lock Screen widgets, Apple Watch integration, Privacy-focused design

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Shield 100SA free?

Shield 100SA is free to download, with no in-app purchases.

### Is Sun Nudge free?

Sun Nudge costs $2.99, with no in-app purchases.

### Do Shield 100SA or Sun Nudge have ads?

Neither Shield 100SA nor Sun Nudge shows ads.

### Which is updated more often, Shield 100SA or Sun Nudge?

Shield 100SA ships an update every 10 days, and Sun Nudge every 4 days. Most recently, Shield 100SA was updated on September 30, 2026 and Sun Nudge on October 8, 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.*