# Kerk vs Perf AI

The clearest difference is in-app purchases: Kerk at none against Perf AI's 2. Kerk also leads on device support (3 vs 1) and iOS requirement (5.1.1 vs 16.4). Perf AI's advantage is update cadence (every 2 months vs every 10 months). On price and ads there is nothing between them.

Both are free to download. Perf AI sells 2 in-app purchases, starting at $7.99 per 7 days. Kerk asks for nothing beyond the download.

Kerk ships an update every 10 months, Perf AI every 2 months. The most recent releases landed on November 1, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Kerk | Perf AI |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 10 months | **Every 2 months** |
| Size | 75 MB | 62 MB |
| Requires iOS | **5.1.1** | 16.4 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Kerk Comercial](https://appshunter.io/developer/1327483304) | [Feras Alshibli](https://appshunter.io/developer/1835107787) |

## What reviewers say

### Kerk

[App page](https://appshunter.io/ios/app/kerk/id927044338)

**Features:** macOS Compatibility

**In-app purchases:** none


### Perf AI

[App page](https://appshunter.io/ios/app/perf-ai-perfume-scanner/id6751437009)

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Premium Access | $7.99 | per 7 days |
| Yearly Premium Access | $49.99 | per year |


## Frequently asked questions

### Is Kerk free?

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

### Is Perf AI free?

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

### Do Kerk or Perf AI have ads?

Neither Kerk nor Perf AI shows ads.

### Which is updated more often, Kerk or Perf AI?

Kerk ships an update every 10 months, and Perf AI every 2 months. Most recently, Kerk was updated on November 1, 2026 and Perf AI on October 30, 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.*