# IR vs FAST智能预警

The clearest difference is ads: IR at none against FAST智能预警's shown. IR also leads on iOS requirement (8.0 vs 12.0). FAST智能预警's advantage is update cadence (monthly vs every 4 months). On price, 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.

IR ships an update every 4 months, FAST智能预警 monthly. Both last shipped on November 3, 2026.

## The numbers

| Metric | IR | FAST智能预警 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[1.0 (2 ratings)](https://appshunter.io/ios/app/ir-tracker-iii/id1527965840/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 4 months | **Monthly** |
| Monetization | Free | — |
| Size | 12 MB | 74 MB |
| Requires iOS | **8.0** | 12.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [zhejiang dali technology co.,ltd](https://appshunter.io/developer/329436737) | [杭州山科智能科技股份有限公司](https://appshunter.io/developer/1785810006) |

## What reviewers say

### IR

[App page](https://appshunter.io/ios/app/ir-tracker-iii/id1527965840)

This handheld monocular uses infrared thermal imaging to provide clear vision in low light or complete darkness. Its compact and rugged design is ideal for outdoor activities like searching, rescuing, and hiking.

**Highlights:** Infrared thermal imaging, Handheld monocular design, Professional display eyepiece, Low visibility operation, Compact and rugged construction, Outdoor use suitability

**In-app purchases:** none


### FAST智能预警

[App page](https://appshunter.io/ios/app/fast/id1668965595)

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

**In-app purchases:** none


## Frequently asked questions

### Is IR free?

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

### Is FAST智能预警 free?

FAST智能预警 is free to download, with no in-app purchases.

### Do IR or FAST智能预警 have ads?

FAST智能预警 shows ads; IR does not.

### Which is updated more often, IR or FAST智能预警?

IR ships an update every 4 months, and FAST智能预警 monthly. Most recently, IR was updated on November 3, 2026 and FAST智能预警 on November 3, 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.*