# 剑飞出书 vs 灵线

The clearest difference is device support: 灵线 at 2 against 剑飞出书's —. 剑飞出书's advantage is iOS requirement (12.0 vs 18.6). On price and in-app purchases there is nothing between them.

Both are free to download. 剑飞出书 sells 1 one-off in-app purchase and 灵线 sells 2 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

## The numbers

| Metric | 剑飞出书 | 灵线 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | — | No |
| Update frequency | — | Every 3 days |
| Size | 68 MB | 28 MB |
| Requires iOS | **12.0** | 18.6 |
| Devices | — | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Guangzhou Shenji Information Technology Co.,Ltd.](https://appshunter.io/developer/1555034604) | [Hefei Yi Qicheng Technology Co., Ltd.](https://appshunter.io/developer/1895580826) |

## What reviewers say

### 剑飞出书

[App page](https://appshunter.io/ios/app/id1664724281)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 剑飞出书365天会员 | $149.99 | one-time |


### 灵线

[App page](https://appshunter.io/ios/app/pdfai/id6763971571)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 月度订阅 | $4.99 | per month |
| 年度订阅 | $39.99 | per year |


## Frequently asked questions

### Is 剑飞出书 free?

剑飞出书 is free to download, with in-app purchases available.

### Is 灵线 free?

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

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*