Comparison

리드아이 Viewer vs Themis Black Box

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

리드아이 Viewer

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
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Leadi is a utility app for Gnet car black box with built-in Wi-Fi. Key features are: - Real-time video display - Search and playback recorded video - Shapshot image or video backup to Photos Album - Changing black box settings

About

Themis Black Box

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
Read full description

Thank you for visiting Themis Black Box app. * It is *** STRONGLY RECOMMENDED *** to use with a COOLER for smartphones for the following reasons. - Due to the nature of the app that processes the video in real time, the device will overheat quickly. - Smartphones will be installed and used in harsh environments such as car dashboards. In addition, to reduce the effect of car vibration, it is recommended to use a cradle that adsorbs to the windshield. * Features of Themis - Supports 4K, 1080p, 720p recording resolutions and various FPS. - Supports UltraWide, Wide, Tele cameras. - Supports HDR (High Dynamic Range) recording. - Supports OIS (Optical Image Stabilization). - Provides clear recorded video frames even when driving in tunnels or at night. *** However, the smartphone's autofocus feature may malfunction on roads or in locations that are too dark, or if there are foreign substances (e.g., smudges, rainwater, etc.) on the windshield. - Built-in speedometer. - Built-in level to help horizontally align the camera. - Various information such as date, time, speed and address are added as a watermark at the top of the recorded video. - Supports search for location where video recording started by linking with Apple Maps and Google Maps. (However, if the region is set to Korea or the language is set to Korean, KakaoMap and NAVER Map are also supported.) - Easily switch camera direction to inside or outside the car with a long tap on the screen. - Supports starting and stopping recording using volume buttons or Bluetooth shutter. - Supports a red mark on the recorded video and the file in the Recorded File Browser screen by double-tapping the screen during video recording so that users can easily find the event they want to remember. - Supports displaying a yellow mark on the recorded file the user wants on the Recorded File Browser screen. - Supports user-marked recorded files protection function. - Supports various screensaver modes. - Various device protection functions. - Supports AirDrop file transfer. - Supports transferring multiple files using data cable and Finder on Mac or iTunes on PC. - Supports Worldwide address. - Supports easy call function. *** However, calls using speakers are currently not supported, and recording is stopped during calls. For FAQs, please refer to the URL below. https://bit.ly/ThemisFAQen Please drive safely with Themis Black Box. * In the sample images of the recorded video included in the app screenshot, part of the license plate has been blurred to protect privacy.

Screenshots

리드아이 Viewer4 screens
Themis Black Box4 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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

UpkeepUpdate frequency

리드아이 Viewer ships an update every 4 months, Themis Black Box every 5 weeks. The most recent releases landed on September 22, 2026 and September 23, 2026 respectively.

Scorecard6 real differences · 2 level
리드아이 Viewer versus Themis Black Box: the parameters behind the verdict, then further details
Parameter리드아이 ViewerThemis Black Box
PriceFreeFree
Positive reviews12.5% of reviews60.7% of reviews — better
Update frequencyEvery 4 monthsEvery 5 weeks — better
AdsNo — betterYes
In-app purchasesNoNo
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS11 — better16.0
Further details — not scored
Size23 MB8 MB
Age rating4+4+
DeveloperHyosung Company CorporationYeontack Jeong

Customer experience

리드아이 Viewer

Written reviews16 reviews
Positive12.5%
Neutral12.5%
Negative75.0%

Themis Black Box

Written reviews28 reviews
Positive60.7%
Neutral14.3%
Negative25.0%

In-app purchases

None

리드아이 Viewer

No in-app purchases

None

Themis Black Box

No in-app purchases

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 September 22, 2026 and Themis Black Box on September 23, 2026.

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