# 纸条作文 vs CoStudy(HD)

The clearest difference is rating: 纸条作文 at 4.8 against CoStudy(HD)'s 4.3. 纸条作文 also leads on ads (none vs shown) and device support (3 vs 1). On price, review sentiment, update cadence and in-app purchases there is nothing between them.

Both are free to download. 纸条作文 sells 29 one-off in-app purchases and CoStudy(HD) sells 13 in-app purchases, starting at $3.99 per month. Whichever you choose, the download price is not the number that matters.

纸条作文 holds the better App Store score, 4.8 against 4.3. Both are backed by a comparable volume of ratings — 137 and 36 respectively. Written reviews point the same way: 96% of 纸条作文's written reviews are positive against 94% of CoStudy(HD)'s.

纸条作文 ships an update every 3 weeks, CoStudy(HD) monthly. The most recent releases landed on October 26, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | 纸条作文 | CoStudy(HD) |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (137 ratings)](https://appshunter.io/ios/app/ai/id1207254643/reviews)** | [4.3 (36 ratings)](https://appshunter.io/ios/app/costudyhd/id1529574126/reviews) |
| Number of ratings | **137** | 36 |
| Positive reviews | **96.1% of reviews** | 93.6% of reviews |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 3 weeks** | Monthly |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 215 MB | 384 MB |
| Requires iOS | **11.0** | 13.0 |
| Devices | **iPhone, iPad, iPod** | iPad |
| Age rating | 4+ | 4+ |
| Developer | [广州启合科技有限公司](https://appshunter.io/developer/1410061681) | [Co-study Information Technology (Shanghai) Co., Ltd](https://appshunter.io/developer/1489845277) |

## What reviewers say

### 纸条作文

[App page](https://appshunter.io/ios/app/ai/id1207254643)

This app provides a vast collection of writing materials, including vocabulary, sentence structures, and essay examples, updated daily and categorized by common themes. It also offers current event analysis, writing techniques, and practice opportunities to help students improve their essay writing skills for exams.

**Highlights:** Daily updated writing materials, Categorized by 20+ themes, Current event analysis and commentary, Application guidance for materials, Online writing practice and peer feedback, Interest-based communities and discussions

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

**In-app purchases (29)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 首购月卡 | $0.99 | one-time |
| 纸条会员 | $0.99 | one-time |
| 月度会员28 | $3.99 | one-time |
| 月度会员 | $4.99 | one-time |
| 月度会员 | $5.99 | one-time |
| 会员卡48 | $6.99 | one-time |
| 会员月卡 | $6.99 | one-time |
| 月度会员 | $6.99 | one-time |
| 纸条会员 | $8.99 | one-time |
| 纸条会员 | $9.99 | one-time |
| 纸条会员 | $11.99 | one-time |
| 季度会员 | $12.99 | one-time |
| 精选合集108（单独解锁） | $14.99 | one-time |
| 纸条会员卡 | $17.99 | one-time |
| 精选合集138（单独解锁） | $19.99 | one-time |
| 纸条会员毕业卡 | $19.99 | one-time |
| 纸条会员毕业卡 | $24.99 | one-time |
| 精选合集168（单独解锁） | $24.99 | one-time |
| 会员年卡188 | $29.99 | one-time |
| 纸条会员 | $29.99 | one-time |
| 年度会员 | $34.99 | one-time |
| 定制会员卡 | $39.99 | one-time |
| 会员378 | $49.99 | one-time |
| 纸条会员 | $49.99 | one-time |
| 会员年卡 | $49.99 | one-time |
| 纸条会员毕业卡 | $59.99 | one-time |
| 纸条会员卡 | $69.99 | one-time |
| 纸条会员毕业卡 | $69.99 | one-time |
| 纸条会员卡 | $79.99 | one-time |

**What reviewers like**

- 📚 Rich and diverse writing materials/素材库
- ✍️ Effective essay writing improvement
- 🎨 Clean and elegant interface design
- 💡 Daily writing prompts and practice features
- 🏆 High-quality curated content from skilled writers

**What reviewers complain about**

- 💰 High subscription/paywall costs unfriendly to students
- 🔄 Increased commercialization and test-prep focus
- 📉 Quality decline in community content over time
- 🚫 Overly strict content moderation policies
- ⚠️ Content becomes paid shortly after collection

**Reported bugs**

- App occasionally freezes or lags
- Collected content disappears from saved folders
- Cannot register with overseas phone numbers
- Search results don't maintain navigation position
- Content moderation errors and false rejections

**Requested features**

- Add excellent essay examples to writing method daily recommendations
- iPad horizontal/landscape mode support
- Simplified collection browsing interface
- Persistent search history and navigation
- International registration options (email, non-China phone numbers)


### CoStudy(HD)

[App page](https://appshunter.io/ios/app/costudyhd/id1529574126)

This app creates a virtual study environment to combat the loneliness of solo learning. It offers features like virtual classrooms, study partners, and focused study sessions with rewards to boost motivation and productivity.

**Highlights:** Virtual campus with different learning buildings, Find study partners with similar goals, Study with friends as virtual desk mates, Strict focus mode with time limits, Earn rewards for focused study sessions, Virtual classroom atmosphere

**Features:** Vision Pro support

**In-app purchases (13)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Co岛会员-连续包月 | $3.99 | per month |
| 购买10个Co钻 | $0.99 | one-time |
| 购买60个Co钻 | $0.99 | one-time |
| 购买180个Co钻 | $2.99 | one-time |
| 购买300个Co钻 | $3.99 | one-time |
| Co岛会员-1个月 | $5.99 | one-time |
| 购买680个Co钻 | $9.99 | one-time |
| Co岛会员-3个月 | $11.99 | one-time |
| 购买980个Co钻 | $14.99 | one-time |
| 购买1280个Co钻 | $19.99 | one-time |
| Co岛会员-12个月 | $29.99 | one-time |
| 购买1980个Co钻 | $29.99 | one-time |
| 购买6480个Co钻 | $99.99 | one-time |

**What reviewers like**

- 👍 Helpful for self-discipline
- 🤝 Ability to study with others
- 💰 Earn coins to buy items
- 🎨 Cute and appealing design
- 🕰️ Effective time management features

**What reviewers complain about**

- 🐛 Connectivity issues
- 🤖 Occasional app crashes
- 💸 Expensive in-app purchases
- 🔒 Difficulty with verification codes

**Reported bugs**

- Inconsistent recording of study time
- Difficulty ending study sessions properly

**Requested features**

- Ability to invite friends to private study rooms
- Option to track study progress and analytics
- Improved sleep tracking and reminders
- More customization options for personal spaces


## Frequently asked questions

### Is 纸条作文 free?

纸条作文 is free to download, with in-app purchases available.

### Is CoStudy(HD) free?

CoStudy(HD) is free to download, with in-app purchases available.

### Which has better reviews, 纸条作文 or CoStudy(HD)?

纸条作文 is rated higher. 纸条作文 averages 4.8 out of 5 from 137 ratings, while CoStudy(HD) averages 4.3 from 36 ratings.

### Do 纸条作文 or CoStudy(HD) have ads?

CoStudy(HD) shows ads; 纸条作文 does not.

### Which is updated more often, 纸条作文 or CoStudy(HD)?

纸条作文 ships an update every 3 weeks, and CoStudy(HD) monthly. Most recently, 纸条作文 was updated on October 26, 2026 and CoStudy(HD) on October 24, 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.*