# C vs OPTRANS

C and OPTRANS are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

C ships an update every 2 weeks, OPTRANS weekly. The most recent releases landed on October 3, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | C | OPTRANS |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Weekly** |
| Size | 197 MB | 71 MB |
| Requires iOS | 14.0 | **13** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 17+ | 4+ |
| Developer | [CMC CIST](https://appshunter.io/developer/1577886893) | [VietMap](https://appshunter.io/developer/461714641) |

## What reviewers say

### C

[App page](https://appshunter.io/ios/app/c-meet-quoc-hoi/id6462052924)

**Features:** macOS Compatibility

**In-app purchases:** none


### OPTRANS

[App page](https://appshunter.io/ios/app/optrans/id6747156607)

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

**In-app purchases:** none


## Frequently asked questions

### Is C free?

C is free to download, with no in-app purchases.

### Is OPTRANS free?

OPTRANS is free to download, with no in-app purchases.

### Do C or OPTRANS have ads?

Neither C nor OPTRANS shows ads.

### Which is updated more often, C or OPTRANS?

C ships an update every 2 weeks, and OPTRANS weekly. Most recently, C was updated on October 3, 2026 and OPTRANS on October 9, 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.*