# DRA Viewer vs THERble

The clearest difference is update cadence: DRA Viewer at every 2 months against THERble's every 16 months. 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.

DRA Viewer ships an update every 2 months, THERble every 16 months. The most recent releases landed on September 10, 2026 and December 12, 2025 respectively.

## The numbers

| Metric | DRA Viewer | THERble |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 16 months |
| Size | 27 MB | 46 MB |
| Requires iOS | 13.0 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [株式会社建築ピボット](https://appshunter.io/developer/1450903325) | [SHIN NIPPON AIR TECHNOLOGIES CO.,LTD.](https://appshunter.io/developer/1526286874) |

## What reviewers say

### DRA Viewer

[App page](https://appshunter.io/ios/app/dra-viewer/id1450903326)

**In-app purchases:** none


### THERble

[App page](https://appshunter.io/ios/app/therble/id1630881111)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is DRA Viewer free?

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

### Is THERble free?

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

### Do DRA Viewer or THERble have ads?

Neither DRA Viewer nor THERble shows ads.

### Which is updated more often, DRA Viewer or THERble?

DRA Viewer ships an update every 2 months, and THERble every 16 months. Most recently, DRA Viewer was updated on September 10, 2026 and THERble on December 12, 2025.

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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.*