# Readwise vs Chengyu Calendar

The clearest difference is update cadence: Chengyu Calendar at daily against Readwise's every 2 weeks. Readwise's advantage is device support (3 vs 1) and iOS requirement (15.5 vs 18.0). On price, ads and in-app purchases there is nothing between them.

Both are free to download. Readwise sells 8 in-app purchases, starting at $4.99 per month and Chengyu Calendar sells 3 in-app purchases, starting at $0.99 per 7 days. Whichever you choose, the download price is not the number that matters.

Readwise ships an update every 2 weeks, Chengyu Calendar daily. The most recent releases landed on October 15, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | Readwise | Chengyu Calendar |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (1.5K ratings)](https://appshunter.io/ios/app/readwise/id1476885528/reviews)** | — |
| Number of ratings | **1.5K** | — |
| Positive reviews | 72.3% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Daily** |
| Monetization | Free with in-app purchases | — |
| Size | 110 MB | 147 MB |
| Requires iOS | **15.5** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 12+ | 4+ |
| Developer | [Readwise, Inc](https://appshunter.io/developer/1476885527) | [Fiachra MacFadden](https://appshunter.io/developer/1831200997) |

## What reviewers say

### Readwise

[App page](https://appshunter.io/ios/app/readwise/id1476885528)

This app helps you retain more of what you read by centralizing and revisiting your highlights from various reading platforms. It uses spaced repetition and active recall techniques to improve memory and offers features like tagging, note-taking, and OCR for physical books.

**Highlights:** Synchronize highlights from multiple platforms, Daily review habit via app and email, Spaced repetition and active recall, Tag, note, and search highlights, OCR for paper book highlights, Convert highlights to flashcards

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

**In-app purchases (8)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Readwise Lite Monthly | $4.99 | per month |
| Readwise Lite Monthly | $6.99 | per month |
| Readwise Full Monthly Plan | $8.99 | per month |
| Readwise Full Monthly | $12.99 | per month |
| Readwise Lite Yearly | $52.99 | per year |
| Readwise Lite Yearly | $66.99 | per year |
| Readwise Full Yearly | $94.99 | per year |
| Readwise Full Yearly | $119.99 | per year |

**What reviewers like**

- 🚀 Powerful spaced repetition
- 📚 Seamless integration with reading apps
- 🔍 Helpful AI-powered features
- 🗓️ Useful daily review routine
- 🧠 Boosts knowledge retention

**What reviewers complain about**

- 💰 Expensive subscription
- 🔌 Sync issues with some platforms
- 📱 Subpar mobile app experience
- 🕰️ Lack of flexibility in daily review
- 🔍 Limited search functionality

**Reported bugs**

- Frequent app crashes
- Sync failures with certain accounts
- Unreliable highlight capture

**Requested features**

- Add support for more reading apps
- Improve sync and import capabilities
- Introduce more customization options
- Enhance search and organization tools
- Develop a more intuitive mobile interface


### Chengyu Calendar

[App page](https://appshunter.io/ios/app/chengyu-calendar/id6813331921)

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly | $0.99 | per 7 days |
| Monthly | $2.99 | per month |
| Yearly | $24.99 | per year |


## Frequently asked questions

### Is Readwise free?

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

### Is Chengyu Calendar free?

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

### Do Readwise or Chengyu Calendar have ads?

Neither Readwise nor Chengyu Calendar shows ads.

### Which is updated more often, Readwise or Chengyu Calendar?

Readwise ships an update every 2 weeks, and Chengyu Calendar daily. Most recently, Readwise was updated on October 15, 2026 and Chengyu Calendar on October 3, 2026.

---

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