# Active Defender vs 试题库

The clearest difference is device support: Active Defender at 3 against 试题库's 1. Active Defender also leads on iOS requirement (15.6 vs 17). On price, update cadence, ads and in-app purchases there is nothing between them.

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

Active Defender ships an update every 2 months, 试题库 every 3 months. The most recent releases landed on October 24, 2026 and October 17, 2026 respectively.

## The numbers

| Metric | Active Defender | 试题库 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.9 (54 ratings)](https://appshunter.io/ios/app/active-defender/id1436872758/reviews)** | — |
| Number of ratings | **54** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 3 months |
| Monetization | Free | — |
| Size | 215 MB | 18 MB |
| Requires iOS | **15.6** | 17 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 17+ |
| Developer | [MMOJ](https://appshunter.io/developer/394675746) | [中科软股教育科技(北京)股份有限公司](https://appshunter.io/developer/1395665821) |

## What reviewers say

### Active Defender

[App page](https://appshunter.io/ios/app/active-defender/id1436872758)

This app provides real-time emergency maps to reduce chaos and confusion during critical incidents. It offers instant visual guidance for students, staff, and first responders, ensuring everyone knows what to do and where to go.  It facilitates communication and provides crucial information for swift and effective emergency response.

**Highlights:** Real-time emergency map, Instant multistory mapping, Emergency alerts, Real-time chat communication, Crisis location and nature, Campus-wide information sharing

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

**In-app purchases:** none


### 试题库

[App page](https://appshunter.io/ios/app/id1478850740)

**In-app purchases:** none


## Frequently asked questions

### Is Active Defender free?

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

### Is 试题库 free?

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

### Do Active Defender or 试题库 have ads?

Neither Active Defender nor 试题库 shows ads.

### Which is updated more often, Active Defender or 试题库?

Active Defender ships an update every 2 months, and 试题库 every 3 months. Most recently, Active Defender was updated on October 24, 2026 and 试题库 on October 17, 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.*