# KOSKİ vs Zetlog

The clearest difference is in-app purchases: KOSKİ at none against Zetlog's 8. KOSKİ also leads on iOS requirement (15.0 vs 17.4). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Zetlog sells 8 in-app purchases, starting at $2.99 per 7 days. KOSKİ asks for nothing beyond the download.

KOSKİ ships an update fortnightly, Zetlog every 3 weeks. The most recent releases landed on October 29, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | KOSKİ | Zetlog |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[2.9 (16 ratings)](https://appshunter.io/ios/app/zetlog-online-tracker/id6445889775/reviews)** |
| Number of ratings | — | **16** |
| Positive reviews | — | 15.4% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 3 weeks |
| Monetization | — | Free with in-app purchases |
| Size | 61 MB | 47 MB |
| Requires iOS | **15.0** | 17.4 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [KOSKİ](https://appshunter.io/developer/1512236255) | [SUPERSKY APPS LIMITED](https://appshunter.io/developer/1625601592) |

## What reviewers say

### KOSKİ

[App page](https://appshunter.io/ios/app/koski/id1512236646)

**Features:** Vision Pro support

**In-app purchases:** none


### Zetlog

[App page](https://appshunter.io/ios/app/zetlog-online-tracker/id6445889775)

This app allows you to monitor your online activity and track when contacts go online or offline. It functions as an activity monitor for your digital presence. Review the terms and privacy policy for usage details.

**Highlights:** Monitor online activity, Track online status, Track offline status, Activity monitoring, Status tracking

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

**In-app purchases (8)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly | $2.99 | per 7 days |
| Weekly 3 | $4.99 | per 7 days |
| Weekly 5 | $6.99 | per 7 days |
| Monthly | $8.99 | per month |
| Monthly 3 | $14.99 | per month |
| Monthly 5 | $19.99 | per month |
| Extra 1 Number | $2.99 | one-time |
| Extra 2 Numbers | $3.99 | one-time |


## Frequently asked questions

### Is KOSKİ free?

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

### Is Zetlog free?

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

### Do KOSKİ or Zetlog have ads?

Neither KOSKİ nor Zetlog shows ads.

### Which is updated more often, KOSKİ or Zetlog?

KOSKİ ships an update fortnightly, and Zetlog every 3 weeks. Most recently, KOSKİ was updated on October 29, 2026 and Zetlog on November 3, 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.*