# Slather vs SunSync

The clearest difference is in-app purchases: Slather at none against SunSync's 2. SunSync's advantage is update cadence (fortnightly vs every 2 months) and iOS requirement (18.6 vs 26.0). On price, ads and device support there is nothing between them.

Both are free to download. SunSync sells 2 in-app purchases, starting at $1.99 per month. Slather asks for nothing beyond the download.

Slather ships an update every 2 months, SunSync fortnightly. The most recent releases landed on September 29, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | Slather | SunSync |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.0 (2 ratings)](https://appshunter.io/ios/app/sunsync-sunscreen-reminder/id6779470861/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | — | 50.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Fortnightly** |
| Monetization | — | Freemium |
| Size | 9 MB | 30 MB |
| Requires iOS | 26.0 | **18.6** |
| Devices | iPhone, iPad, Apple Watch | iPhone, iPad, Apple Watch |
| Age rating | 4+ | 12+ |
| Developer | [David Price](https://appshunter.io/developer/1087027317) | [Samuel Araya](https://appshunter.io/developer/1891843842) |

## What reviewers say

### Slather

[App page](https://appshunter.io/ios/app/slather-up/id6775721110)

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

**In-app purchases:** none


### SunSync

[App page](https://appshunter.io/ios/app/sunsync-sunscreen-reminder/id6779470861)

This app helps you stay safe in the sun by providing local UV index information, smart sunscreen reapplication timers, and gentle reminders. It personalizes your sun protection based on your skin type and activity, turning sun safety into a simple daily ritual.

**Highlights:** Local UV index readings, Smart sunscreen reapply timer, Personalized sun protection, Gentle reapply reminders, UV alerts with quiet hours, Home/Lock Screen UV widget

**Features:** Apple Watch app

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| SunSync Plus Monthly | $1.99 | per month |
| SunSync Plus Yearly | $14.99 | per year |


## Frequently asked questions

### Is Slather free?

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

### Is SunSync free?

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

### Do Slather or SunSync have ads?

Neither Slather nor SunSync shows ads.

### Which is updated more often, Slather or SunSync?

Slather ships an update every 2 months, and SunSync fortnightly. Most recently, Slather was updated on September 29, 2026 and SunSync on October 5, 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.*