# iSTC. vs IR master

The clearest difference is rating: IR master at 3.7 against iSTC.'s 1.5. iSTC.'s advantage is iOS requirement (9.0 vs 13.0). On price, ratings volume, update cadence and ads there is nothing between them.

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

IR master holds the better App Store score, 3.7 against 1.5. Both are backed by a comparable volume of ratings — 2 and 3 respectively.

iSTC. ships an update every 2 months, IR master every 3 months. The most recent releases landed on October 7, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | iSTC. | IR master |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.5 (2 ratings)](https://appshunter.io/ios/app/istc/id1475875977/reviews) | **[3.7 (3 ratings)](https://appshunter.io/ios/app/ir-master/id1614218116/reviews)** |
| Number of ratings | 2 | **3** |
| Positive reviews | — | 26.7% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 3 months |
| Monetization | Free | Free |
| Size | 8 MB | 77 MB |
| Requires iOS | **9.0** | 13.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [HK Meet Ltd](https://appshunter.io/developer/687246274) | [InfiRay Technologies Co.,Ltd.](https://appshunter.io/developer/1516230719) |

## What reviewers say

### iSTC.

[App page](https://appshunter.io/ios/app/istc/id1475875977)

Connect a thermal image camera to your smartphone via Wi-Fi to view live thermal feeds. Analyze temperature data, capture images, and retrieve external measurement data from compatible products.

**Highlights:** Wi-Fi connection to thermal cameras, Live thermal image viewing on phone, Max/min/point temperature display, Image capture functionality, Bluetooth external measure data retrieval

**Features:** macOS Compatibility

**In-app purchases:** none


### IR master

[App page](https://appshunter.io/ios/app/ir-master/id1614218116)

This application transforms your smartphone into a high-resolution infrared thermal imager. It offers detailed temperature data output for various applications, from industrial inspections to personal health monitoring.

**Highlights:** High-resolution infrared thermal imaging, Real-time temperature data output, Wide range of application directions, Consumer-level infrared thermography, Night vision capabilities

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is iSTC. free?

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

### Is IR master free?

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

### Which has better reviews, iSTC. or IR master?

IR master is rated higher. iSTC. averages 1.5 out of 5 from 2 ratings, while IR master averages 3.7 from 3 ratings.

### Do iSTC. or IR master have ads?

Neither iSTC. nor IR master shows ads.

### Which is updated more often, iSTC. or IR master?

iSTC. ships an update every 2 months, and IR master every 3 months. Most recently, iSTC. was updated on October 7, 2026 and IR master on October 14, 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.*