# PHK Key vs BIGFIRE AIoT

The clearest difference is update cadence: BIGFIRE AIoT at every 8 days against PHK Key's monthly. PHK Key's advantage is iOS requirement (9.0 vs 18.6). 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.

PHK Key ships an update monthly, BIGFIRE AIoT every 8 days. The most recent releases landed on October 6, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | PHK Key | BIGFIRE AIoT |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[1.0 (1 ratings)](https://appshunter.io/ios/app/phk-key/id1331863191/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Monthly | **Every 8 days** |
| Monetization | Free | — |
| Size | 2 MB | 84 MB |
| Requires iOS | **9.0** | 18.6 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Phillip Securities (HK) Limited](https://appshunter.io/developer/466984983) | [BIG FIRE SURVEILLANCE TECHNOLOGY LIMITED](https://appshunter.io/developer/1720073949) |

## What reviewers say

### PHK Key

[App page](https://appshunter.io/ios/app/phk-key/id1331863191)

This security code generator provides two-factor authentication for online trading. Download it to your mobile device to enhance your account security.

**Highlights:** Two-factor login authentication, Online trading security, Mobile code generation, Enhanced security

**Features:** macOS Compatibility

**In-app purchases:** none


### BIGFIRE AIoT

[App page](https://appshunter.io/ios/app/bigfire-aiot/id6755093984)

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

**In-app purchases:** none


## Frequently asked questions

### Is PHK Key free?

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

### Is BIGFIRE AIoT free?

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

### Do PHK Key or BIGFIRE AIoT have ads?

Neither PHK Key nor BIGFIRE AIoT shows ads.

### Which is updated more often, PHK Key or BIGFIRE AIoT?

PHK Key ships an update monthly, and BIGFIRE AIoT every 8 days. Most recently, PHK Key was updated on October 6, 2026 and BIGFIRE AIoT on October 28, 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.*