Comparison

C vs Three9x

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

Head to head
About

C

Features
Read full description

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.

About

Three9x

Features
Read full description

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

C3 screens
Three9x4 screens

Verdict

The call

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

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

C ships an update every 10 days, Three9x every 5 weeks. Both last shipped on October 25, 2026.

Scorecard2 real differences · 4 level
C versus Three9x: the parameters behind the verdict, then further details
ParameterCThree9x
PriceFreeFree
Update frequencyEvery 10 days — betterEvery 5 weeks
AdsNoNo
In-app purchasesNoNo
DevicesiPhone, iPodiPhone, iPod
Requires iOS12.0 — better15.6
Further details — not scored
Size56 MB496 MB
Age rating12+4+
DeveloperXiamen C-chip Technology Co., Ltd.THREE9X (SMC-PRIVATE) LIMITED

In-app purchases

None

C

No in-app purchases

None

Three9x

No in-app purchases

Questions

Is C free?
C is free to download, with no in-app purchases.
Is Three9x free?
Three9x is free to download, with no in-app purchases.
Do C or Three9x have ads?
Neither C nor Three9x shows ads.
Which is updated more often, C or Three9x?
C ships an update every 10 days, and Three9x every 5 weeks. Most recently, C was updated on October 25, 2026 and Three9x on October 25, 2026.

Other comparisons