# CT vs AUDIT System

The clearest difference is update cadence: AUDIT System at every 5 weeks against CT's every 3 months. CT's advantage is iOS requirement (12.0 vs 15.0). 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.

CT ships an update every 3 months, AUDIT System every 5 weeks. The most recent releases landed on July 31, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | CT | AUDIT System |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 66.7% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 5 weeks** |
| Monetization | Free | — |
| Size | 41 MB | 71 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [DATANET GmbH](https://appshunter.io/developer/1455823939) | [Fid-Software GmbH](https://appshunter.io/developer/1123621145) |

## What reviewers say

### CT

[App page](https://appshunter.io/ios/app/ct-userview/id1455823940)

Monitor business mobile phone contract costs and usage easily. Transparently control billing data and services from your mobile network provider with detailed reports and an overview of all fees.

**Highlights:** Dashboard overview of costs and fees, Detailed cost breakdown, Usage data per phone number, Contract information overview, Monitor monthly expenses

**Features:** macOS Compatibility

**In-app purchases:** none


### AUDIT System

[App page](https://appshunter.io/ios/app/audit-system/id1522687079)

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

**In-app purchases:** none


## Frequently asked questions

### Is CT free?

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

### Is AUDIT System free?

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

### Do CT or AUDIT System have ads?

Neither CT nor AUDIT System shows ads.

### Which is updated more often, CT or AUDIT System?

CT ships an update every 3 months, and AUDIT System every 5 weeks. Most recently, CT was updated on July 31, 2026 and AUDIT System on September 18, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*