# 白丁友记 vs 53Hz

The clearest difference is update cadence: 53Hz at every 2 days against 白丁友记's fortnightly. 53Hz also leads on rating (4.3 vs 4.0) and ratings volume (3 vs 1). 白丁友记's advantage is iOS requirement (15.0 vs 17.0). On price, review sentiment, ads and in-app purchases there is nothing between them.

Both are free to download. 白丁友记 sells 11 one-off in-app purchases and 53Hz sells 4 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.

53Hz holds the better App Store score, 4.3 against 4.0. Both are backed by a comparable volume of ratings — 1 and 3 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

白丁友记 ships an update fortnightly, 53Hz every 2 days. The most recent releases landed on October 13, 2026 and October 20, 2026 respectively.

## The numbers

| Metric | 白丁友记 | 53Hz |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.0 (1 ratings)](https://appshunter.io/ios/app/id1597540766/reviews) | **[4.3 (3 ratings)](https://appshunter.io/ios/app/53hz/id6756495021/reviews)** |
| Number of ratings | 1 | **3** |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 2 days** |
| Monetization | Free with in-app purchases | Freemium |
| Size | 85 MB | 198 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 17+ | 17+ |
| Developer | [士诚 赵](https://appshunter.io/developer/1596543342) | [Haoqiang Chai](https://appshunter.io/developer/1163486933) |

## What reviewers say

### 白丁友记

[App page](https://appshunter.io/ios/app/id1597540766)

This app offers a unique space for private sharing and connection through letters, voice messages, and shared diaries. It simulates real-world correspondence with customizable stamps and stationery, fostering deep connections with pen pals, voice friends, and diary companions.

**Highlights:** Private letter writing with simulated postage, Shared diary entries for close friends, Voice message and audio recording, Customizable stamps, stationery, and envelopes, Late-night radio for shared stories, Connect with pen pals and voice friends

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

**In-app purchases (11)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 4金币 | $0.99 | one-time |
| 2金币 | $0.99 | one-time |
| 邮票包 | $0.99 | one-time |
| 季会员 | $1.99 | one-time |
| 8金币 | $1.99 | one-time |
| 12金币 | $2.99 | one-time |
| 年会员 | $3.99 | one-time |
| 20金币 | $4.99 | one-time |
| 永久vip | $4.99 | one-time |
| 终身会员 | $5.99 | one-time |
| 28金币 | $5.99 | one-time |


### 53Hz

[App page](https://appshunter.io/ios/app/53hz/id6756495021)

Express your current thoughts and connect with others through algorithmically matched anonymous content. Unlock identities and start conversations only after mutual interest is shown, prioritizing genuine expression over popularity metrics.

**Highlights:** Publish dynamic thoughts, Content-based matching, Receive 6 matched recommendations, Anonymous browsing, Unlock identity upon mutual interest, Private chat space

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PRO 包月续费 | $1.99 | per month |
| 加油包 | $0.99 | one-time |
| PRO 月费 | $2.99 | one-time |
| PRO 年包 | $6.99 | one-time |


## Frequently asked questions

### Is 白丁友记 free?

白丁友记 is free to download, with in-app purchases available.

### Is 53Hz free?

53Hz is free to download, with in-app purchases available.

### Which has better reviews, 白丁友记 or 53Hz?

53Hz is rated higher. 白丁友记 averages 4.0 out of 5 from 1 ratings, while 53Hz averages 4.3 from 3 ratings.

### Do 白丁友记 or 53Hz have ads?

Neither 白丁友记 nor 53Hz shows ads.

### Which is updated more often, 白丁友记 or 53Hz?

白丁友记 ships an update fortnightly, and 53Hz every 2 days. Most recently, 白丁友记 was updated on October 13, 2026 and 53Hz on October 20, 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.*