# 音流Soflux vs Keyin

The clearest difference is in-app purchases: 音流Soflux at none against Keyin's 3. Keyin's advantage is update cadence (every 5 days vs every 2 weeks) and device support (3 vs 1). On price and ads there is nothing between them.

Both are free to download. Keyin sells 3 in-app purchases, starting at $24.99 per month. 音流Soflux asks for nothing beyond the download.

音流Soflux ships an update every 2 weeks, Keyin every 5 days. The most recent releases landed on October 30, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | 音流Soflux | Keyin |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (10 ratings)](https://appshunter.io/ios/app/keyin-live-translator-and-edit/id6753168626/reviews)** |
| Number of ratings | — | **10** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Every 5 days** |
| Monetization | — | Freemium |
| Size | 106 MB | 21 MB |
| Requires iOS | 16.0 | **14.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 17+ | 4+ |
| Developer | [深圳市矢量律动科技有限公司](https://appshunter.io/developer/1824120103) | [Sichuan Yunyou Lifang Technology Co., Ltd.](https://appshunter.io/developer/1842816823) |

## What reviewers say

### 音流Soflux

[App page](https://appshunter.io/ios/app/soflux-aiai/id6744960465)

**Features:** macOS Compatibility

**In-app purchases:** none


### Keyin

[App page](https://appshunter.io/ios/app/keyin-live-translator-and-edit/id6753168626)

This app breaks down language barriers with real-time translation for live streams, courses, and conferences. It automatically generates editable bilingual transcripts and offers flexible text styling for efficient note-taking and content creation.

**Highlights:** Cross-lingual live streaming translation, 100+ language simultaneous interpretation, Voice-to-text notes, Editable bilingual transcripts, Flexible text styling, Real-time note generation

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 按月订阅Pro | $24.99 | per month |
| 按年订阅Pro | $149.99 | per year |
| 月度会员Pro | $29.99 | one-time |


## Frequently asked questions

### Is 音流Soflux free?

音流Soflux is free to download, with no in-app purchases.

### Is Keyin free?

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

### Do 音流Soflux or Keyin have ads?

Neither 音流Soflux nor Keyin shows ads.

### Which is updated more often, 音流Soflux or Keyin?

音流Soflux ships an update every 2 weeks, and Keyin every 5 days. Most recently, 音流Soflux was updated on October 30, 2026 and Keyin on November 5, 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.*