# 环境监控预警 vs JackCrm

The clearest difference is update cadence: JackCrm at fortnightly against 环境监控预警's every 3 months. 环境监控预警'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.

环境监控预警 ships an update every 3 months, JackCrm fortnightly. The most recent releases landed on October 25, 2026 and October 20, 2026 respectively.

## The numbers

| Metric | 环境监控预警 | JackCrm |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Fortnightly** |
| Size | 78 MB | 92 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [江苏汇环环保科技有限公司](https://appshunter.io/developer/1335902310) | [帅 倪](https://appshunter.io/developer/1205384816) |

## What reviewers say

### 环境监控预警

[App page](https://appshunter.io/ios/app/id1506853134)

**Features:** macOS Compatibility

**In-app purchases:** none


### JackCrm

[App page](https://appshunter.io/ios/app/jackcrm/id1559841270)

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

**In-app purchases:** none


## Frequently asked questions

### Is 环境监控预警 free?

环境监控预警 is free to download, with no in-app purchases.

### Is JackCrm free?

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

### Do 环境监控预警 or JackCrm have ads?

Neither 环境监控预警 nor JackCrm shows ads.

### Which is updated more often, 环境监控预警 or JackCrm?

环境监控预警 ships an update every 3 months, and JackCrm fortnightly. Most recently, 环境监控预警 was updated on October 25, 2026 and JackCrm on October 20, 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.*