C vs SIONYX
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.
SIONYX
Stream video and control your SIONYX Nightwave and OPSIN devices. This app allows for seamless command and upgrade functions for your compatible night vision equipment.
- Video streaming
- Command and control functions
- Device upgrades
- Nightwave device support
- OPSIN device support
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The SIONYX App enables video streaming, command and control functions and upgrade on your SIONYX Nightwave and OPSIN devices.
Screenshots
Verdict
The clearest difference is price: SIONYX at Free against C's $2.99. SIONYX also leads on rating (2.7 vs 1.0) and review sentiment (27% vs 0%). C's advantage is iOS requirement (13.0 vs 15.6). On ads, 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
SIONYX is free to download; C costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.
SIONYX holds the better App Store score, 2.7 against 1.0. That said, the two scores are not equally well evidenced: SIONYX has 15 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 27% of SIONYX's.
C ships an update every 14 months, SIONYX every 5 months. The most recent releases landed on November 1, 2026 and October 6, 2026 respectively.
| Parameter | C | SIONYX |
|---|---|---|
| Price | $2.99 | Free — better |
| Rating | 1.0 (1 ratings) | 2.7 (15 ratings) — better |
| Positive reviews | 0.0% of reviews | 27.3% of reviews — better |
| Number of ratings | 1 | 15 — better |
| Update frequency | Every 14 months | Every 5 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Free — better |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 13.0 — better | 15.6 |
| Further details — not scored | ||
| Size | 4 MB | 128 MB |
| Age rating | 4+ | 4+ |
| Developer | alpha prompt co.,ltd. | SiOnyx, LLC |
Customer experience
C
SIONYX
In-app purchases
C
No in-app purchases
SIONYX
No in-app purchases
