# Audira vs 灵线

The clearest difference is in-app purchases: Audira at none against 灵线's 2. Audira also leads on iOS requirement (15.1 vs 18.6). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. 灵线 sells 2 in-app purchases, starting at $4.99 per month. Audira asks for nothing beyond the download.

Audira ships an update every 4 days, 灵线 every 3 days. The most recent releases landed on September 13, 2026 and September 16, 2026 respectively.

## The numbers

| Metric | Audira | 灵线 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 days | **Every 3 days** |
| Size | 44 MB | 28 MB |
| Requires iOS | **15.1** | 18.6 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Bili Tech](https://appshunter.io/developer/1603802628) | [Hefei Yi Qicheng Technology Co., Ltd.](https://appshunter.io/developer/1895580826) |

## What reviewers say

### Audira

[App page](https://appshunter.io/ios/app/audira/id6745397801)

**Features:** macOS Compatibility

**In-app purchases:** none


### 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 Audira free?

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

### Is 灵线 free?

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

### Do Audira or 灵线 have ads?

Neither Audira nor 灵线 shows ads.

### Which is updated more often, Audira or 灵线?

Audira ships an update every 4 days, and 灵线 every 3 days. Most recently, Audira was updated on September 13, 2026 and 灵线 on September 16, 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.*