# 百思笔记 vs 灵线

The clearest difference is update cadence: 灵线 at every 3 days against 百思笔记's weekly. 百思笔记's advantage is iOS requirement (15 vs 18.6). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. 百思笔记 sells 1 in-app purchase, starting at $0.99 per month 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.

百思笔记 ships an update weekly, 灵线 every 3 days. The most recent releases landed on September 12, 2026 and September 16, 2026 respectively.

## The numbers

| Metric | 百思笔记 | 灵线 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/ai-best-note/id6746778545/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Weekly | **Every 3 days** |
| Monetization | Freemium | — |
| Size | 383 MB | 28 MB |
| Requires iOS | **15** | 18.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [智汇学海](https://appshunter.io/developer/1514896327) | [Hefei Yi Qicheng Technology Co., Ltd.](https://appshunter.io/developer/1895580826) |

## What reviewers say

### 百思笔记

[App page](https://appshunter.io/ios/app/ai-best-note/id6746778545)

This app acts as an AI knowledge operating system, transforming various forms of input like text, audio, and scans into interconnected, reusable knowledge units. It offers features for recording, understanding, organizing, and reusing information, with a focus on privacy and seamless integration.

**Highlights:** Multi-modal input (text, voice, audio, docs, images, scans, web), Real-time voice to text with speaker labeling, Simultaneous translation for 50+ languages, Document scanning with OCR and perspective correction, In-app browser for research and note-taking, Cloud synchronization across devices, Full-text search with word-level matching

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 基础会员-月付 | $0.99 | per month |


### 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 百思笔记 free?

百思笔记 is free to download, with in-app purchases available.

### Is 灵线 free?

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

### Do 百思笔记 or 灵线 have ads?

Neither 百思笔记 nor 灵线 shows ads.

### Which is updated more often, 百思笔记 or 灵线?

百思笔记 ships an update weekly, and 灵线 every 3 days. Most recently, 百思笔记 was updated on September 12, 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.*