C vs Three9x
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
C
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C OX is a new type of smart glasses assistive tool. When connected to a device, it can view images in real time, take photos and record videos, and also has functions such as setting the recording duration, checking the storage space of the glasses' SD card, and firmware upgrades. It can also view, download, and delete videos and pictures on the glasses' SD card.
Three9x
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Use THREE9X APP to pair and synchronize smart glasses with mobile phones. Main functions: [Glasses operation] Connect the mobile phone and glasses via Bluetooth pairing to achieve precise control of the glasses system, such as adjusting volume, gesture settings, glasses system updates, etc. [Photo/video transmission] Use the glasses WIFI module to launch hotspots, support exporting, synchronizing, viewing, editing, sharing, and saving photos and videos taken by the glasses on the mobile phone; [AI voice assistant] Connect to the AI ​​big model, and realize AI question and answer and AI object recognition under Bluetooth connection;
Screenshots
Verdict
The clearest difference is update cadence: C at every 10 days against Three9x's every 5 weeks. C also leads on iOS requirement (12.0 vs 15.6). On price, 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
C ships an update every 10 days, Three9x every 5 weeks. Both last shipped on October 25, 2026.
| Parameter | C | Three9x |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 10 days — better | Every 5 weeks |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPod | iPhone, iPod |
| Requires iOS | 12.0 — better | 15.6 |
| Further details — not scored | ||
| Size | 56 MB | 496 MB |
| Age rating | 12+ | 4+ |
| Developer | Xiamen C-chip Technology Co., Ltd. | THREE9X (SMC-PRIVATE) LIMITED |
In-app purchases
C
No in-app purchases
Three9x
No in-app purchases









