# D vs Thermal Master

The clearest difference is update cadence: Thermal Master at every 3 weeks against D's every 6 weeks. 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.

D ships an update every 6 weeks, Thermal Master every 3 weeks. The most recent releases landed on August 22, 2026 and September 9, 2026 respectively.

## The numbers

| Metric | D | Thermal Master |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[2.3 (14 ratings)](https://appshunter.io/ios/app/thermal-master/id6737389515/reviews)** |
| Number of ratings | — | **14** |
| Positive reviews | — | 36.4% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Every 3 weeks** |
| Monetization | — | Free |
| Size | 47 MB | 126 MB |
| Requires iOS | 13.0 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 17+ |
| Developer | [Shenzhen DiscoveryOpt Technology Co., Ltd.](https://appshunter.io/developer/1822511782) | [Thermal Master Technology Co.,Ltd.](https://appshunter.io/developer/1770222118) |

## What reviewers say

### D

[App page](https://appshunter.io/ios/app/d-vision/id6479838973)

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

**In-app purchases:** none


### Thermal Master

[App page](https://appshunter.io/ios/app/thermal-master/id6737389515)

This utility app connects to specific thermal camera models, offering enhanced thermal imaging capabilities. It features an upgraded algorithm for clearer heat source detection and supports digital zoom for precise target identification. The app provides lifetime free software upgrades.

**Highlights:** Connects to P, X, DV, and T2Max series thermal cameras, Upgraded Insight+ algorithm for noise suppression, Enhanced heat source visibility, Up to 15x digital zoom, Lifetime free software upgrades

**In-app purchases:** none


## Frequently asked questions

### Is D free?

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

### Is Thermal Master free?

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

### Do D or Thermal Master have ads?

Neither D nor Thermal Master shows ads.

### Which is updated more often, D or Thermal Master?

D ships an update every 6 weeks, and Thermal Master every 3 weeks. Most recently, D was updated on August 22, 2026 and Thermal Master on September 9, 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.*