# 火先知 vs hey

The clearest difference is in-app purchases: 火先知 at none against hey's 4. 火先知 also leads on update cadence (every 3 weeks vs every 2 months). hey's advantage is iOS requirement (9.0 vs 12.0). On price, ads and device support there is nothing between them.

Both are free to download. hey sells 4 one-off in-app purchases. 火先知 asks for nothing beyond the download.

火先知 ships an update every 3 weeks, hey every 2 months. The most recent releases landed on September 23, 2026 and October 29, 2026 respectively.

## The numbers

| Metric | 火先知 | hey |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 2 months |
| Size | 123 MB | 155 MB |
| Requires iOS | 12.0 | **9.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Hikvision Digital Technology Co.,Ltd](https://appshunter.io/developer/358934279) | [Shenzhen Heiman Technology Co., Ltd.](https://appshunter.io/developer/1060327146) |

## What reviewers say

### 火先知

[App page](https://appshunter.io/ios/app/id1476029559)

**Features:** macOS Compatibility

**In-app purchases:** none


### hey

[App page](https://appshunter.io/ios/app/hey-smart/id1478579161)

**Features:** macOS Compatibility, Siri integration

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 存储7天月套餐 | $1.99 | one-time |
| 存储30天月套餐 | $4.99 | one-time |
| 存储7天年套餐 | $18.99 | one-time |
| 存储30天年套餐 | $47.99 | one-time |


## Frequently asked questions

### Is 火先知 free?

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

### Is hey free?

hey is free to download, with in-app purchases available.

### Do 火先知 or hey have ads?

Neither 火先知 nor hey shows ads.

### Which is updated more often, 火先知 or hey?

火先知 ships an update every 3 weeks, and hey every 2 months. Most recently, 火先知 was updated on September 23, 2026 and hey on October 29, 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.*