Comparison

音流Soflux vs Keyin

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

音流Soflux

Features
Read full description

Seamless Global Communication Real-time AI-powered simultaneous translation, supporting 140+ languages for effortless conversations during international travel and business meetings. Highly accurate meeting transcription, instantly converting speech to text with one-click meeting minutes export. Smart Chat Assistant Featuring an AI-driven chat model, answering questions, drafting copy, and brainstorming ideas – your ultimate office companion

About

Keyin

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
Read full description

「Global Voices, Translated at Will」 Welcome to KeyinSync – your pocket-sized assistant for global communication and content creation. We don’t just break down language barriers – we help you capture every spark of inspiration as it happens. Whether you're watching a live stream from across the ocean, taking an overseas course, or attending an international conference, KeyinSync works like a professional simultaneous interpreter – helping you understand in real time and take notes efficiently. 【Core Features】 • Cross-Lingual Live Streaming Translate live audio in real time – no waiting for captions. Follow global product launches, gaming streams, and breaking news as if you were there. Stay in sync with the world. • 100+ Language Simultaneous Interpretation Real-time translation between over 100 languages. Covers live streams, short videos, meetings, in-game audio, and more. Communicate without barriers. • Voice-to-Text Notes – Complete & Editable Our exclusive core feature! Automatically generates editable, bilingual transcripts as you listen. Supports long-form content with no interruptions – perfect for recording hours-long conferences or documentaries without missing a word. • Flexible Text Styling Freely customize text structure, add highlights and to-dos. Organize your ideas and logic clearly – making note-taking faster and more effective. 【Use Cases】 Watch overseas live streams, documentaries, and open courses with instant bilingual captions and notes Join international conferences and online training sessions – ensure nothing gets lost in translation Daily cross-language communication and content creation – improve efficiency and understanding We offer more than translation – we provide a complete solution to hear, understand, record, and organize. From documentaries exploring the mysteries of the universe to stories of human origins 10,000 years ago, KeyinSync is your perfect companion for expanding your horizons, learning efficiently, and working deeply. 【User Agreement & Privacy Policy】 https://www.keyinx.com/user-agreement https://www.keyinx.com/privacy-policy

Screenshots

音流Soflux4 screens
Keyin4 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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.

UpkeepUpdate frequency

音流Soflux ships an update every 2 weeks, Keyin every 5 days. Both last shipped on October 30, 2026.

Scorecard4 real differences · 5 level
音流Soflux versus Keyin: the parameters behind the verdict, then further details
Parameter音流SofluxKeyin
PriceFreeFree
Rating—5.0 (10 ratings) — better
Number of ratings—10 — better
Update frequencyEvery 2 weeksEvery 5 days — better
AdsNoNo
In-app purchasesNo — betterYes
Monetization—Freemium
DevicesiPhoneiPhone, iPad, iPod — better
Requires iOS16.014.0 — better
Further details — not scored
Size106 MB21 MB
Age rating17+4+
Developer深圳市矢量律动科技有限公司Sichuan Yunyou Lifang Technology Co., Ltd.

In-app purchases

None

音流Soflux

No in-app purchases

3 purchases

Keyin

Subscriptions2
  • 按月订阅Pro$24.991 Month
  • 按年订阅Pro$149.991 Year
One-time1
  • 月度会员Pro$29.99

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 October 30, 2026.

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