C vs USB Camera to NDI
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
C
This app analyzes photographs to display the color of any point in XYZ and L*a*b* color spaces. It also allows for measuring the distance between two colors within the L*a*b* color space. Calibration options are available for matching camera characteristics and photography environments.
- Color measurement in XYZ and L*a*b*
- Distance measurement between colors
- Camera characteristic adjustment
- Photography environment calibration
- Color checker calibration
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C-MEASURE is application to measure a simple color. It display the color of an arbitrary place of the photograph in XYZ, L*a*b*. In addition, It can measure distance on the L*a*b* color space of two colors. The conversion parameter to the chromaticity value performs the adjustment that It matched with the characteristic of the camera of iPhone4 from photograph data, but the calibration that It accept photography environment, and used the color checkers is possible.
USB Camera to NDI
This app allows you to monitor and convert UVC cameras to NDI streams in real-time. It supports various NDI formats, offers simultaneous recording to Photos, and can extend camera capabilities using HDMI adapters.
- Monitor UVC cameras for free
- Switch between multiple UVC cameras
- Real-time NDI conversion
- Supports FULL NDI, NDI HX H.264, NDI HX HEVC
- Record to Photos simultaneously
- NDI tally status indicator
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- Monitoring any UVC camera for free - Switch in multiple UVC cameras - Audio UV meters included - Record to Photos simultaneously - Converts UVC camera to NDI in real-time, supports FULL NDI, NDI HX H.264, NDI HX HEVC - NDI tally status indicator - Use HDMI -> USB adapter to extend more traditional cameras, no longer need an expensive HDMI-NDI converter any more - Use a USB-C adapter with HDMI output for external full-screen monitoring - Use Apple TV, Google TV Stick or Amazon Fire TV Stick for wireless AirPlay monitoring
Screenshots
Verdict
The clearest difference is price: USB Camera to NDI at Free against C's $2.99. USB Camera to NDI also leads on rating (3.9 vs 1.0) and update cadence (every 5 weeks vs every 14 months). C's advantage is in-app purchases (none vs 4) and iOS requirement (13.0 vs 17.6). On ads 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
USB Camera to NDI is free to download; C costs $2.99 up front. USB Camera to NDI sells 4 one-off in-app purchases. C asks for nothing beyond the download.
USB Camera to NDI holds the better App Store score, 3.9 against 1.0. That said, the two scores are not equally well evidenced: USB Camera to NDI has 102 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 0% of C's written reviews are positive against 25% of USB Camera to NDI's.
C ships an update every 14 months, USB Camera to NDI every 5 weeks. The most recent releases landed on November 1, 2026 and October 30, 2026 respectively.
| Parameter | C | USB Camera to NDI |
|---|---|---|
| Price | $2.99 | Free — better |
| Rating | 1.0 (1 ratings) | 3.9 (102 ratings) — better |
| Positive reviews | 0.0% of reviews | 25.0% of reviews — better |
| Number of ratings | 1 | 102 — better |
| Update frequency | Every 14 months | Every 5 weeks — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Paid | Free with in-app purchases — better |
| Devices | iPhone, iPod | iPhone, iPad |
| Requires iOS | 13.0 — better | 17.6 |
| Further details — not scored | ||
| Size | 4 MB | 41 MB |
| Age rating | 4+ | 4+ |
| Developer | alpha prompt co.,ltd. | TopDirector Corporation |
Customer experience
C
USB Camera to NDI
In-app purchases
C
No in-app purchases
USB Camera to NDI
- Remove Ads$0.99
- Enable NDI Sending$4.99
- Enable Recording and Snapshot$9.99
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- HDMI, ScreenMirroring, AirPlay$9.99
Questions
Is C free?
Is USB Camera to NDI free?
Which has better reviews, C or USB Camera to NDI?
Do C or USB Camera to NDI have ads?
Which is updated more often, C or USB Camera to NDI?
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