# HONGHA ECOCITY vs CT Passkey

The clearest difference is update cadence: CT Passkey at every 9 days against HONGHA ECOCITY's every 3 weeks. HONGHA ECOCITY's advantage is iOS requirement (12.0 vs 15.6). On price, ads, in-app purchases and device support there is nothing between them.

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

HONGHA ECOCITY ships an update every 3 weeks, CT Passkey every 9 days. The most recent releases landed on September 30, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | HONGHA ECOCITY | CT Passkey |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 9 days** |
| Size | 46 MB | 40 MB |
| Requires iOS | **12.0** | 15.6 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Hoang Quoc Dong](https://appshunter.io/developer/1345167131) | [IT Department, General Department of Taxation of Viet Nam](https://appshunter.io/developer/1589750684) |

## What reviewers say

### HONGHA ECOCITY

[App page](https://appshunter.io/ios/app/hongha-ecocity/id1658995799)

**Features:** macOS Compatibility

**In-app purchases:** none


### CT Passkey

[App page](https://appshunter.io/ios/app/ct-passkey/id6755713591)

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

**In-app purchases:** none


## Frequently asked questions

### Is HONGHA ECOCITY free?

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

### Is CT Passkey free?

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

### Do HONGHA ECOCITY or CT Passkey have ads?

Neither HONGHA ECOCITY nor CT Passkey shows ads.

### Which is updated more often, HONGHA ECOCITY or CT Passkey?

HONGHA ECOCITY ships an update every 3 weeks, and CT Passkey every 9 days. Most recently, HONGHA ECOCITY was updated on September 30, 2026 and CT Passkey 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.*