Comparison

Themis Black Box vs BlackBox Viewer

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

Head to head
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.

About

BlackBox Viewer

View real-time video from your black box and manage its settings. Watch and download recorded footage from all channels. Configure recording, ADAS, audio, and Wi-Fi options.

Highlights
  • Real-time live video streaming
  • View and download recorded footage
  • Configure recording settings
  • Manage ADAS settings
  • Adjust audio and Wi-Fi settings
Features
Read full description

BlackBox Viewer is an app that allows you to view the recorded video in real time using the black box's Wi-Fi and control the settings of the black box. Live View: You can view the video being recorded in real time on the connected channel. Recorded video: You can watch and download videos of all recorded channels. Environment Settings: You can configure the black box environment settings (recording settings, ADAS settings, audio settings, Wi-Fi settings, etc.). have. Initial passwords are weak in security. Change the password in [Preferences->Hotspot Settings->Password Settings].

Screenshots

Themis Black Box4 screens
BlackBox Viewer4 screens

Verdict

The call

The clearest difference is review sentiment: Themis Black Box at 61% against BlackBox Viewer's 0%. Themis Black Box also leads on update cadence (every 5 weeks vs every 3 months). BlackBox Viewer's advantage is ads (none vs shown) and monetization model (free vs free with in-app purchases). On price, in-app purchases and device support 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

Themis Black Box ships an update every 5 weeks, BlackBox Viewer every 3 months. Both last shipped on November 7, 2026.

Scorecard5 real differences · 5 level
Themis Black Box versus BlackBox Viewer: the parameters behind the verdict, then further details
ParameterThemis Black BoxBlackBox Viewer
PriceFreeFree
Rating—3.0 (2 ratings) — better
Positive reviews60.7% of reviews — better0.0% of reviews
Number of ratings—2 — better
Update frequencyEvery 5 weeks — betterEvery 3 months
AdsYesNo — better
In-app purchasesNoNo
MonetizationFree with in-app purchasesFree — better
DevicesiPhoneiPhone, iPod — better
Requires iOS16.013.0 — better
Further details — not scored
Size8 MB33 MB
Age rating4+4+
DeveloperYeontack Jeong(주)이에스브이

Customer experience

Themis Black Box

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

BlackBox Viewer

All ratings2 ratings
Positive50.0%
Neutral0.0%
Negative50.0%
Written reviews1 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

In-app purchases

None

Themis Black Box

No in-app purchases

None

BlackBox Viewer

No in-app purchases

Questions

Is Themis Black Box free?
Themis Black Box is free to download, with no in-app purchases.
Is BlackBox Viewer free?
BlackBox Viewer is free to download, with no in-app purchases.
Do Themis Black Box or BlackBox Viewer have ads?
Themis Black Box shows ads; BlackBox Viewer does not.
Which is updated more often, Themis Black Box or BlackBox Viewer?
Themis Black Box ships an update every 5 weeks, and BlackBox Viewer every 3 months. Most recently, Themis Black Box was updated on November 7, 2026 and BlackBox Viewer on November 7, 2026.

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