# TAS Viewer vs Trevaron

The clearest difference is in-app purchases: TAS Viewer at none against Trevaron's 3. On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Trevaron sells 3 in-app purchases, starting at $7.99 per month. TAS Viewer asks for nothing beyond the download.

TAS Viewer ships an update every 2 months, Trevaron monthly. The most recent releases landed on September 15, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | TAS Viewer | Trevaron |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Monthly** |
| Monetization | Free | — |
| Size | 32 MB | 111 MB |
| Requires iOS | **14.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [红杰 李](https://appshunter.io/developer/1602186097) | [Guangzhou Zhonglipin Intelligent Technology Co., Ltd.](https://appshunter.io/developer/1891560214) |

## What reviewers say

### TAS Viewer

[App page](https://appshunter.io/ios/app/tas-viewer/id1605567151)

This application provides tools for the secondary analysis of infrared imaging data. It allows users to examine and interpret thermal images for various purposes.

**Highlights:** Infrared imaging secondary analysis, Thermal image interpretation, Data examination tools

**Features:** macOS Compatibility

**In-app purchases:** none


### Trevaron

[App page](https://appshunter.io/ios/app/trevaron/id6763711626)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Membership subscription | $7.99 | per month |
| Premium Membership (Six Month) | $39.99 | per 6 months |
| Membership subscription | $69.99 | per year |


## Frequently asked questions

### Is TAS Viewer free?

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

### Is Trevaron free?

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

### Do TAS Viewer or Trevaron have ads?

Neither TAS Viewer nor Trevaron shows ads.

### Which is updated more often, TAS Viewer or Trevaron?

TAS Viewer ships an update every 2 months, and Trevaron monthly. Most recently, TAS Viewer was updated on September 15, 2026 and Trevaron on October 16, 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.*