# iParallel平行的我 vs 白丁友记

The clearest difference is in-app purchases: iParallel平行的我 at none against 白丁友记's 11. iParallel平行的我 also leads on update cadence (weekly vs fortnightly) and iOS requirement (8.0 vs 15.0). On price, ads and device support there is nothing between them.

Both are free to download. 白丁友记 sells 11 one-off in-app purchases. iParallel平行的我 asks for nothing beyond the download.

iParallel平行的我 ships an update weekly, 白丁友记 fortnightly. The most recent releases landed on September 25, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | iParallel平行的我 | 白丁友记 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.0 (1 ratings)](https://appshunter.io/ios/app/id1597540766/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Weekly** | Fortnightly |
| Monetization | — | Free with in-app purchases |
| Size | 149 MB | 85 MB |
| Requires iOS | **8.0** | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 9+ | 17+ |
| Developer | [Jiaxi Liu](https://appshunter.io/developer/956396589) | [士诚 赵](https://appshunter.io/developer/1596543342) |

## What reviewers say

### iParallel平行的我

[App page](https://appshunter.io/ios/app/iparallel/id1133404708)

**In-app purchases:** none


### 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 |


## Frequently asked questions

### Is iParallel平行的我 free?

iParallel平行的我 is free to download, with no in-app purchases.

### Is 白丁友记 free?

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

### Do iParallel平行的我 or 白丁友记 have ads?

Neither iParallel平行的我 nor 白丁友记 shows ads.

### Which is updated more often, iParallel平行的我 or 白丁友记?

iParallel平行的我 ships an update weekly, and 白丁友记 fortnightly. Most recently, iParallel平行的我 was updated on September 25, 2026 and 白丁友记 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.*