# C vs USB Camera to NDI

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.

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.

## The numbers

| Metric | C | USB Camera to NDI |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | [1.0 (1 ratings)](https://appshunter.io/ios/app/c-measure/id397314427/reviews) | **[3.9 (102 ratings)](https://appshunter.io/ios/app/usb-camera-to-ndi/id6476429895/reviews)** |
| Number of ratings | 1 | **102** |
| Positive reviews | 0.0% of reviews | **25.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 14 months | **Every 5 weeks** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 4 MB | 41 MB |
| Requires iOS | **13.0** | 17.6 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [alpha prompt co.,ltd.](https://appshunter.io/developer/391698490) | [TopDirector Corporation](https://appshunter.io/developer/1581209934) |

## What reviewers say

### C

[App page](https://appshunter.io/ios/app/c-measure/id397314427)

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.

**Highlights:** Color measurement in XYZ and L*a*b*, Distance measurement between colors, Camera characteristic adjustment, Photography environment calibration, Color checker calibration

**Features:** macOS Compatibility

**In-app purchases:** none


### USB Camera to NDI

[App page](https://appshunter.io/ios/app/usb-camera-to-ndi/id6476429895)

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.

**Highlights:** 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

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $0.99 | one-time |
| Enable NDI Sending | $4.99 | one-time |
| Enable Recording and Snapshot | $9.99 | one-time |
| HDMI, ScreenMirroring, AirPlay | $9.99 | one-time |


## Frequently asked questions

### Is C free?

C costs $2.99, with no in-app purchases.

### Is USB Camera to NDI free?

USB Camera to NDI is free to download, with in-app purchases available.

### Which has better reviews, C or USB Camera to NDI?

USB Camera to NDI is rated higher. C averages 1.0 out of 5 from 1 ratings, while USB Camera to NDI averages 3.9 from 102 ratings.

### Do C or USB Camera to NDI have ads?

Neither C nor USB Camera to NDI shows ads.

### Which is updated more often, C or USB Camera to NDI?

C ships an update every 14 months, and USB Camera to NDI every 5 weeks. Most recently, C was updated on November 1, 2026 and USB Camera to NDI on October 30, 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.*