# Ajax PRO vs Krill

The clearest difference is update cadence: Krill at every 4 days against Ajax PRO's fortnightly. Krill also leads on iOS requirement (14.0 vs 18.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Ajax PRO ships an update fortnightly, Krill every 4 days. The most recent releases landed on October 24, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | Ajax PRO | Krill |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (14 ratings)](https://appshunter.io/ios/app/ajax-pro-tool-for-engineers/id1249276895/reviews)** | — |
| Number of ratings | **14** | — |
| Positive reviews | 72.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 4 days** |
| Monetization | Free | — |
| Size | 654 MB | 13 MB |
| Requires iOS | 18.0 | **14.0** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [Ajax Systems Inc](https://appshunter.io/developer/1063166246) | [Phicus Tecnologia S.L.](https://appshunter.io/developer/1665081986) |

## What reviewers say

### Ajax PRO

[App page](https://appshunter.io/ios/app/ajax-pro-tool-for-engineers/id1249276895)

This app empowers security system installers and company employees to manage and configure Ajax security systems. It facilitates quick connections, adjustments, and testing of devices, offering extensive control over an unlimited number of security systems, user access, and automation scenarios.

**Highlights:** Administer unlimited security systems, Monitor system status and adjust settings, Manage user access rights, Create objects and connect equipment, Test devices and connect cameras, Customize automation scenarios and security schedules, Connect hubs to monitoring stations

**Features:** Vision Pro support

**In-app purchases:** none


### Krill

[App page](https://appshunter.io/ios/app/krill/id6547851118)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Ajax PRO free?

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

### Is Krill free?

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

### Do Ajax PRO or Krill have ads?

Neither Ajax PRO nor Krill shows ads.

### Which is updated more often, Ajax PRO or Krill?

Ajax PRO ships an update fortnightly, and Krill every 4 days. Most recently, Ajax PRO was updated on October 24, 2026 and Krill on October 11, 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.*