# 第二信号 vs Sub

The clearest difference is ratings volume: Sub at 155 against 第二信号's 3. 第二信号's advantage is iOS requirement (13.0 vs 15.0). On price, rating, update cadence and ads there is nothing between them.

Both are free to download. 第二信号 sells 9 in-app purchases, starting at $5.99 per month and Sub sells 10 in-app purchases, starting at $1.99 per 7 days. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 4.7 for 第二信号 against 4.6 for Sub. That said, the two scores are not equally well evidenced: Sub has 155 ratings behind it against 3, so its average is the more settled of the two.

Both ship on a similar rhythm, roughly every 2 weeks. The most recent releases landed on October 21, 2026 and October 29, 2026 respectively.

## The numbers

| Metric | 第二信号 | Sub |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (3 ratings)](https://appshunter.io/ios/app/id1523591723/reviews)** | [4.6 (155 ratings)](https://appshunter.io/ios/app/sub/id1543526849/reviews) |
| Number of ratings | 3 | **155** |
| Positive reviews | — | 90.7% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 2 weeks | Every 2 weeks |
| Monetization | Freemium | Free with in-app purchases |
| Size | 119 MB | 240 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPod, Apple Watch** |
| Age rating | 17+ | 17+ |
| Developer | [Shanghai Zemengzhixia Technology Co., Ltd](https://appshunter.io/developer/1503971781) | [Uni Dating App Ltd.](https://appshunter.io/developer/1647775425) |

## What reviewers say

### 第二信号

[App page](https://appshunter.io/ios/app/id1523591723)

This app encourages authentic self-expression and emotional sharing through a unique social networking platform. Users can connect with like-minded individuals, share life moments via photos and text, and build new relationships.

**Highlights:** Create 'Cards' as personal introductions, Share photos and text updates, Discover and connect with new people, Send 'stars' to show appreciation, Private messaging for friends, Build a personal relationship network

**In-app purchases (9)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Signal Premium月度会员（1个月） | $5.99 | per month |
| Signal Premium季度会员（3个月） | $13.99 | per 3 months |
| Signal Premium年度会员（12个月） | $45.99 | per year |
| 60信号币 - 6元 | $0.99 | one-time |
| 300信号币 - 30元 | $4.99 | one-time |
| 680信号币 - 68元 | $9.99 | one-time |
| 980信号币 - 98元 | $14.99 | one-time |
| 1180信号币 - 118元 | $17.99 | one-time |
| 1980信号币 - 198元 | $29.99 | one-time |


### Sub

[App page](https://appshunter.io/ios/app/sub/id1543526849)

A platform for finding like-minded individuals within subcultures. It emphasizes authentic self-expression and offers robust privacy features to create a secure and pure social circle. Discover diverse interests and connect with real users through verification.

**Highlights:** Subculture matching, Privacy settings, Anti-screenshot protection, Anti-harassment features, Pure social circle, User verification, Knowledge sharing

**Features:** Apple Watch app, Vision Pro support

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 少数派字母圈一周会员 | $1.99 | per 7 days |
| 少数派字母圈一个月会员 | $4.99 | per month |
| 少数派字母圈三个月会员 | $12.99 | per 3 months |
| 少数派字母圈六个月会员 | $19.99 | per 6 months |
| Sub字母圈极乐园金币一级 | $0.99 | one-time |
| Sub字母圈极乐园金币二级 | $0.99 | one-time |
| Sub字母圈极乐园金币三级 | $6.99 | one-time |
| Sub字母圈极乐园金币四级 | $9.99 | one-time |
| Sub字母圈极乐园金币五级 | $17.99 | one-time |
| Sub字母圈极乐园金币六级 | $29.99 | one-time |


## Frequently asked questions

### Is 第二信号 free?

第二信号 is free to download, with in-app purchases available.

### Is Sub free?

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

### Which has better reviews, 第二信号 or Sub?

第二信号 is rated higher. 第二信号 averages 4.7 out of 5 from 3 ratings, while Sub averages 4.6 from 155 ratings.

### Do 第二信号 or Sub have ads?

Neither 第二信号 nor Sub shows ads.

### Which is updated more often, 第二信号 or Sub?

第二信号 ships an update every 2 weeks, and Sub every 2 weeks. Most recently, 第二信号 was updated on October 21, 2026 and Sub on October 29, 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.*