# SOS Viewer vs Winder

The clearest difference is in-app purchases: SOS Viewer at none against Winder's 1. SOS Viewer also leads on iOS requirement (15.6 vs 26.2). Winder's advantage is update cadence (every 5 days vs fortnightly). On price, ads and device support there is nothing between them.

Both are free to download. Winder sells 1 one-off in-app purchase. SOS Viewer asks for nothing beyond the download.

SOS Viewer ships an update fortnightly, Winder every 5 days. The most recent releases landed on October 12, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | SOS Viewer | Winder |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/winder-precision-clock/id6749173558/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 5 days** |
| Monetization | — | Free with in-app purchases |
| Size | 66 MB | 15 MB |
| Requires iOS | **15.6** | 26.2 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Tech Tree Sdn Bhd](https://appshunter.io/developer/1756843252) | [IVAN ALEJANDRO MUNGUIA CRUZ](https://appshunter.io/developer/1829095431) |

## What reviewers say

### SOS Viewer

[App page](https://appshunter.io/ios/app/sos-viewer/id6742965163)

**In-app purchases:** none


### Winder

[App page](https://appshunter.io/ios/app/winder-precision-clock/id6749173558)

This app provides highly accurate time synchronization with atomic time servers. It features beautifully crafted, animated watch dials and optional sound cues for precise timekeeping. Designed for watch enthusiasts, it prioritizes privacy with no data collection.

**Highlights:** Atomic time synchronization (NTP), Drift strip for device offset, Continuous-sweep second hand, Analog and digital display options, 12 handcrafted, animated dial themes, Optional countdown sound cues, No data collection or tracking

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Winder Pro | $4.99 | one-time |


## Frequently asked questions

### Is SOS Viewer free?

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

### Is Winder free?

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

### Do SOS Viewer or Winder have ads?

Neither SOS Viewer nor Winder shows ads.

### Which is updated more often, SOS Viewer or Winder?

SOS Viewer ships an update fortnightly, and Winder every 5 days. Most recently, SOS Viewer was updated on October 12, 2026 and Winder on October 13, 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.*