# DOO vs 知止

The clearest difference is in-app purchases: 知止 at none against DOO's 2. On price, update cadence, ads and device support there is nothing between them.

Both are free to download. DOO sells 2 in-app purchases, starting at $0.99 per month. 知止 asks for nothing beyond the download.

DOO ships an update fortnightly, 知止 monthly. The most recent releases landed on October 15, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | DOO | 知止 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/doo/id6755932181/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Fortnightly** | Monthly |
| Monetization | Freemium | — |
| Size | 18 MB | 14 MB |
| Requires iOS | 18.0 | **17.0** |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [银时(成都)科技有限公司](https://appshunter.io/developer/1834154774) | [玉庭 何](https://appshunter.io/developer/1867438392) |

## What reviewers say

### DOO

[App page](https://appshunter.io/ios/app/doo/id6755932181)

This app uses AI to convert your spoken thoughts into clear to-do items and reminders. It offers a unique single-page interface for seamless task management, integrating with iOS for a focused experience.

**Highlights:** AI-powered natural language input, Single-page interface for all tasks, Support for recurring and sub-tasks, Lunar calendar and Chinese holidays, External ICS calendar subscription, iCloud sync and backup (Pro)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| DOO Pro（月度） | $0.99 | per month |
| DOO Pro（年度） | $8.99 | per year |


### 知止

[App page](https://appshunter.io/ios/app/id6758208809)

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

**In-app purchases:** none


## Frequently asked questions

### Is DOO free?

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

### Is 知止 free?

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

### Do DOO or 知止 have ads?

Neither DOO nor 知止 shows ads.

### Which is updated more often, DOO or 知止?

DOO ships an update fortnightly, and 知止 monthly. Most recently, DOO was updated on October 15, 2026 and 知止 on October 13, 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.*