# 书非借 vs When

The clearest difference is in-app purchases: 书非借 at none against When's 3. 书非借 also leads on update cadence (every 2 days vs every 4 days). On price, review sentiment, ads and device support there is nothing between them.

Both are free to download. When sells 3 in-app purchases, starting at $0.99 per month. 书非借 asks for nothing beyond the download.

书非借 ships an update every 2 days, When every 4 days. The most recent releases landed on November 1, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | 书非借 | When |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/id6741096319/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 2 days** | Every 4 days |
| Monetization | — | Freemium |
| Size | 6 MB | 6 MB |
| Requires iOS | **17.6** | 18.0 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [杭州引力网络技术有限公司](https://appshunter.io/developer/1133518651) | [Andras Varga](https://appshunter.io/developer/1841546733) |

## What reviewers say

### 书非借

[App page](https://appshunter.io/ios/app/id6741096319)

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

**In-app purchases:** none


### When

[App page](https://appshunter.io/ios/app/when-then-and-next/id6804155280)

This app helps you remember important dates and track recurring tasks. It offers timeline views for upcoming events and 'last time' tracking for past activities. Organize items with categories, add notes, and use widgets for quick access.

**Highlights:** Timeline view for upcoming events, Track recurring tasks, Expiry and renewal date tracking, Birthday and anniversary reminders, Home and Lock Screen widgets, Organize with categories and icons, Add notes and attachments

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Monthly | $0.99 | per month |
| Pro Yearly | $7.99 | per year |
| When Pro Lifetime | $19.99 | one-time |


## Frequently asked questions

### Is 书非借 free?

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

### Is When free?

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

### Do 书非借 or When have ads?

Neither 书非借 nor When shows ads.

### Which is updated more often, 书非借 or When?

书非借 ships an update every 2 days, and When every 4 days. Most recently, 书非借 was updated on November 1, 2026 and When on October 31, 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.*