# 리드아이 Viewer vs Themis Black Box

The clearest difference is review sentiment: Themis Black Box at 61% against 리드아이 Viewer's 13%. Themis Black Box also leads on update cadence (every 5 weeks vs every 4 months). 리드아이 Viewer's advantage is ads (none vs shown) and monetization model (free vs free with in-app purchases). On price and in-app purchases there is nothing between them.

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

리드아이 Viewer ships an update every 4 months, Themis Black Box every 5 weeks. The most recent releases landed on October 27, 2026 and October 19, 2026 respectively.

## The numbers

| Metric | 리드아이 Viewer | Themis Black Box |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 12.5% of reviews | **60.7% of reviews** |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 4 months | **Every 5 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 23 MB | 8 MB |
| Requires iOS | **11** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Hyosung Company Corporation](https://appshunter.io/developer/1515426253) | [Yeontack Jeong](https://appshunter.io/developer/334795593) |

## What reviewers say

### 리드아이 Viewer

[App page](https://appshunter.io/ios/app/viewer/id1515426254)

This utility app connects to a car's built-in Wi-Fi black box. It allows users to view real-time video, search and play back recordings, and back up footage to their device's photo album. Users can also adjust the black box settings through the app.

**Highlights:** Real-time video display, Search and playback recorded video, Snapshot image or video backup, Change black box settings

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

**In-app purchases:** none


### Themis Black Box

[App page](https://appshunter.io/ios/app/themis-black-box/id1577907867)

This app transforms your smartphone into a high-quality dashcam, offering advanced recording features like 4K resolution, HDR, and image stabilization. It includes a built-in speedometer, GPS logging, and watermarking for speed and location data, with easy file management and sharing options.

**Highlights:** 4K, 1080p, 720p recording resolutions, UltraWide, Wide, Tele camera support, HDR and OIS recording, Built-in speedometer and level, GPS location and speed watermarking, Easy file management and sharing, Camera direction switching

**In-app purchases:** none


## Frequently asked questions

### Is 리드아이 Viewer free?

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

### Is Themis Black Box free?

Themis Black Box is free to download, with no in-app purchases.

### Do 리드아이 Viewer or Themis Black Box have ads?

Themis Black Box shows ads; 리드아이 Viewer does not.

### Which is updated more often, 리드아이 Viewer or Themis Black Box?

리드아이 Viewer ships an update every 4 months, and Themis Black Box every 5 weeks. Most recently, 리드아이 Viewer was updated on October 27, 2026 and Themis Black Box on October 19, 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.*