# 灵犀 vs 知答

The clearest difference is in-app purchases: 灵犀 at none against 知答's 4. 知答's advantage is update cadence (weekly vs every 3 weeks). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. 知答 sells 4 one-off in-app purchases. 灵犀 asks for nothing beyond the download.

灵犀 ships an update every 3 weeks, 知答 weekly. The most recent releases landed on August 4, 2026 and September 11, 2026 respectively.

## The numbers

| Metric | 灵犀 | 知答 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Weekly** |
| Size | 134 MB | 77 MB |
| Requires iOS | 15.6 | 15.6 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [忠占 司](https://appshunter.io/developer/1706233998) | [晓生 唐](https://appshunter.io/developer/1680679241) |

## What reviewers say

### 灵犀

[App page](https://appshunter.io/ios/app/ai/id6449481086)

**Features:** macOS Compatibility

**In-app purchases:** none


### 知答

[App page](https://appshunter.io/ios/app/ai-agent/id6739323442)

**Features:** macOS Compatibility

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 购买60个知豆 | $0.99 | one-time |
| 购买180个知豆 | $2.99 | one-time |
| 购买300个知豆 | $3.99 | one-time |
| 购买1680个知豆 | $24.99 | one-time |


## Frequently asked questions

### Is 灵犀 free?

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

### Is 知答 free?

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

### Do 灵犀 or 知答 have ads?

Neither 灵犀 nor 知答 shows ads.

### Which is updated more often, 灵犀 or 知答?

灵犀 ships an update every 3 weeks, and 知答 weekly. Most recently, 灵犀 was updated on August 4, 2026 and 知答 on September 11, 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.*