# SkinIO vs Zeitfarer

The clearest difference is in-app purchases: SkinIO at none against Zeitfarer's 1. SkinIO also leads on ratings volume (64 vs 2) and device support (3 vs 1). Zeitfarer's advantage is update cadence (every 2 days vs monthly) and rating (5.0 vs 4.6). On price, review sentiment and ads there is nothing between them.

Both are free to download. Zeitfarer sells 1 one-off in-app purchase. SkinIO asks for nothing beyond the download.

Zeitfarer holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: SkinIO has 64 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 96% of SkinIO's written reviews are positive against 100% of Zeitfarer's.

SkinIO ships an update monthly, Zeitfarer every 2 days. The most recent releases landed on November 2, 2026 and November 10, 2026 respectively.

## The numbers

| Metric | SkinIO | Zeitfarer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.6 (64 ratings)](https://appshunter.io/ios/app/skinio/id1161541232/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/zeitfarer/id6793001799/reviews)** |
| Number of ratings | **64** | 2 |
| Positive reviews | 95.7% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Every 2 days** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 207 MB | 7 MB |
| Requires iOS | **15.4** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 17+ | 17+ |
| Developer | [SkinIO, LLC](https://appshunter.io/developer/371459487) | [McCall Aviation Consulting, LLC](https://appshunter.io/developer/6793001801) |

## What reviewers say

### SkinIO

[App page](https://appshunter.io/ios/app/skinio/id1161541232)

Empower your skin health with AI-driven mole mapping for early detection of skin cancer. Track changes over time with your iOS device or in-office, and securely share images with dermatologists for expert review. Receive timely results and maintain a living digital record of your skin.

**Highlights:** AI-driven mole mapping, DIY skin screening, Digital skin health record, Secure image sharing with dermatologists, Track skin changes over time, HIPAA-compliant data storage

**Features:** Vision Pro support

**In-app purchases:** none


### Zeitfarer

[App page](https://appshunter.io/ios/app/zeitfarer/id6793001799)

This app helps airline pilots and flight crews manage jet lag and optimize rest. It creates personalized schedules for sleep, light, meals, and more, based on scientific research and individual travel plans. The tool adapts to actual rest breaks and helps crews stay alert during flights.

**Highlights:** Circadian rhythm modeling, Personalized sleep and rest schedules, Integration of light, meals, caffeine, and melatonin, Adaptation to actual rest breaks, Offline trip planning, Real-time trip status updates

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Zeitfarer Unlock | $24.99 | one-time |


## Frequently asked questions

### Is SkinIO free?

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

### Is Zeitfarer free?

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

### Which has better reviews, SkinIO or Zeitfarer?

Zeitfarer is rated higher. SkinIO averages 4.6 out of 5 from 64 ratings, while Zeitfarer averages 5.0 from 2 ratings.

### Do SkinIO or Zeitfarer have ads?

Neither SkinIO nor Zeitfarer shows ads.

### Which is updated more often, SkinIO or Zeitfarer?

SkinIO ships an update monthly, and Zeitfarer every 2 days. Most recently, SkinIO was updated on November 2, 2026 and Zeitfarer on November 10, 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.*