# ZDL vs USC Trojan Check

The clearest difference is review sentiment: ZDL at 100% against USC Trojan Check's 0%. ZDL also leads on rating (5.0 vs 1.7). USC Trojan Check's advantage is ratings volume (94 vs 2) and update cadence (every 5 weeks vs every 4 months). On price, ads, in-app purchases and monetization model there is nothing between them.

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

ZDL holds the better App Store score, 5.0 against 1.7. That said, the two scores are not equally well evidenced: USC Trojan Check has 94 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 100% of ZDL's written reviews are positive against 0% of USC Trojan Check's.

ZDL ships an update every 4 months, USC Trojan Check every 5 weeks. The most recent releases landed on November 2, 2026 and November 7, 2026 respectively.

## The numbers

| Metric | ZDL | USC Trojan Check |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/zdl/id1415744847/reviews)** | [1.7 (94 ratings)](https://appshunter.io/ios/app/usc-trojan-check/id1524393111/reviews) |
| Number of ratings | 2 | **94** |
| Positive reviews | **100.0% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 5 weeks** |
| Monetization | Free | Free |
| Size | 23 MB | 1 MB |
| Requires iOS | 14.0 | **11.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Blackwired Pte Ltd.](https://appshunter.io/developer/1642378647) | [University of Southern California Apps](https://appshunter.io/developer/540434445) |

## What reviewers say

### ZDL

[App page](https://appshunter.io/ios/app/zdl/id1415744847)

This platform offers real-time cyber-attack prevention by providing a unique view of adversary preparations. It aims to proactively safeguard enterprises from cyber threats before they occur.

**Highlights:** Proactive cyber-attack prevention, Real-time adversary monitoring, Global cyber observatory, Enterprise-level cyber-warfare capability, Performance updates and bug fixes

**Features:** macOS Compatibility

**In-app purchases:** none


### USC Trojan Check

[App page](https://appshunter.io/ios/app/usc-trojan-check/id1524393111)

This app facilitates a safe return to campus for USC students and employees. It allows users to complete a daily wellness assessment and request access to campus spaces or departments. Essential for maintaining campus safety and operations.

**Highlights:** Daily wellness assessment, Campus space access requests, Student and employee tool, Guest access, Safe campus return facilitation

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is ZDL free?

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

### Is USC Trojan Check free?

USC Trojan Check is free to download, with no in-app purchases.

### Which has better reviews, ZDL or USC Trojan Check?

ZDL is rated higher. ZDL averages 5.0 out of 5 from 2 ratings, while USC Trojan Check averages 1.7 from 94 ratings.

### Do ZDL or USC Trojan Check have ads?

Neither ZDL nor USC Trojan Check shows ads.

### Which is updated more often, ZDL or USC Trojan Check?

ZDL ships an update every 4 months, and USC Trojan Check every 5 weeks. Most recently, ZDL was updated on November 2, 2026 and USC Trojan Check on November 7, 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.*