# Voltcraft DOK Series vs Thermal Viewer

The clearest difference is in-app purchases: Voltcraft DOK Series at none against Thermal Viewer's 3. Voltcraft DOK Series also leads on iOS requirement (13.0 vs 15.0). Thermal Viewer's advantage is update cadence (every 5 days vs monthly) and device support (4 vs 2). On price and ads there is nothing between them.

Both are free to download. Thermal Viewer sells 3 in-app purchases, starting at $4.99 per 7 days. Voltcraft DOK Series asks for nothing beyond the download.

Voltcraft DOK Series ships an update monthly, Thermal Viewer every 5 days. The most recent releases landed on October 28, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | Voltcraft DOK Series | Thermal Viewer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/thermal-viewer-ir-analyzer/id6779991634/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | — | 50.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Every 5 days** |
| Monetization | — | Freemium |
| Size | 4 MB | 35 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod, Mac** |
| Age rating | 9+ | 4+ |
| Developer | [CEI Conrad Electronic International (HK) Limited](https://appshunter.io/developer/756357900) | [Rush Tools LLC](https://appshunter.io/developer/1896773547) |

## What reviewers say

### Voltcraft DOK Series

[App page](https://appshunter.io/ios/app/voltcraft-dok-series/id6763523733)

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

**In-app purchases:** none


### Thermal Viewer

[App page](https://appshunter.io/ios/app/thermal-viewer-ir-analyzer/id6779991634)

Analyze radiometric thermal images directly on your iPhone, iPad, or Mac. This app supports various thermal file formats and offers advanced analysis tools like temperature readings, measurement tools, and color palettes. Export data and images for further review, all while keeping your images private and offline.

**Highlights:** Radiometric thermal image analysis, Temperature measurement (spot, box, ellipse, line), Multiple color palettes, Live re-analysis with adjustable parameters, Visible-light blend and MSX-style overlay, Export temperature matrix to CSV, Batch export of images and settings

**Features:** Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Weekly | $4.99 | per 7 days |
| Pro Yearly | $29.99 | per year |
| Lifetime Access | $49.99 | one-time |


## Frequently asked questions

### Is Voltcraft DOK Series free?

Voltcraft DOK Series is free to download, with no in-app purchases.

### Is Thermal Viewer free?

Thermal Viewer is free to download, with in-app purchases available.

### Do Voltcraft DOK Series or Thermal Viewer have ads?

Neither Voltcraft DOK Series nor Thermal Viewer shows ads.

### Which is updated more often, Voltcraft DOK Series or Thermal Viewer?

Voltcraft DOK Series ships an update monthly, and Thermal Viewer every 5 days. Most recently, Voltcraft DOK Series was updated on October 28, 2026 and Thermal Viewer on November 5, 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.*