# 天書 vs Avtech DVR

The clearest difference is update cadence: Avtech DVR at every 2 months against 天書's every 6 months. Avtech DVR also leads on iOS requirement (11.0 vs 13.0). 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.

天書 ships an update every 6 months, Avtech DVR every 2 months. The most recent releases landed on October 3, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | 天書 | Avtech DVR |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[1.0 (1 ratings)](https://appshunter.io/ios/app/avtech-dvr/id1490400846/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 2 months** |
| Monetization | — | Free |
| Size | 28 MB | 29 MB |
| Requires iOS | 13.0 | **11.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 9+ |
| Developer | [恵鴻資訊](https://appshunter.io/developer/448261969) | [Avtech](https://appshunter.io/developer/328936967) |

## What reviewers say

### 天書

[App page](https://appshunter.io/ios/app/id448261966)

**Features:** Vision Pro support

**In-app purchases:** none


### Avtech DVR

[App page](https://appshunter.io/ios/app/avtech-dvr/id1490400846)

This surveillance application allows users to monitor live feeds from AVTECH recorders. It offers features for controlling PTZ functions, managing I/O alarms, and performing quick searches and backups of recorded events.

**Highlights:** Live monitoring (individual/multiple view), Remote PTZ control (direction/zoom), Remote I/O alarm control, Live snapshot, Quick search and backup, Event video notifications

**In-app purchases:** none


## Frequently asked questions

### Is 天書 free?

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

### Is Avtech DVR free?

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

### Do 天書 or Avtech DVR have ads?

Neither 天書 nor Avtech DVR shows ads.

### Which is updated more often, 天書 or Avtech DVR?

天書 ships an update every 6 months, and Avtech DVR every 2 months. Most recently, 天書 was updated on October 3, 2026 and Avtech DVR 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.*