Comparison

Soniox vs Keystone

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

Head to head
About

Soniox

This app uses advanced AI to transcribe and translate speech in over 60 languages in real-time. It provides instant summaries, identifies speakers, and offers context-aware accuracy for enhanced understanding. Securely share or export your transcribed conversations and notes.

Highlights
  • Real-time transcription with speaker ID
  • Speech translation in 60+ languages
  • AI-generated summaries and key insights
  • Custom AI prompts for analysis
  • Context-aware accuracy enhancement
  • Privacy-first design with on-device processing
  • Easy sharing and export options
Read full description

Soniox – Transcribe, translate in 60+ languages at high accuracy in real-time! The most accurate AI companion to transcribe your meetings or translate conversations live. Instantly create concise and useful summaries and make your notes perfect! Whether you're in a global meeting, attending a multilingual lecture, or exploring abroad, Soniox helps you understand and be understood in over 60 languages. It’s more than a translator – it’s a universal speech assistant that transcribes, translates, and summarizes key moments, even if speakers switch languages mid-sentence. Key Features: - Real-Time Transcription with Speaker ID: Instantly convert speech into text with world-class accuracy and automatic speaker labeling – even in multi-speaker environments and mixed languages. - Speech Translation (One-Way & Two-Way): Understand and communicate across languages. Soniox translates speech in real time, either one-way or two-way for natural conversations. - AI Summaries & Key Insights: Get instant summaries, to-do lists, quotes, and highlights from your conversations or meetings. Perfect for classes, interviews, and reviews. - Custom AI Prompts: Ask Soniox to extract action items, translate summaries, or analyze conversations using flexible AI-powered commands. - Context-Aware Accuracy: Add context hints like names or terms to boost transcription and translation quality – even with accents or technical language. - Privacy-First Design: Your audio recordings stay on your device. Even translation happens securely, ensuring full confidentiality. - Easy Sharing & Export: Share transcripts, summaries, and translations via secure links or export them for your records with one tap. Powered by cutting-edge universal speech AI developed internally by Soniox, we deliver fast, private, and accurate results in any supported language – all in one intuitive app. Download Soniox today to transcribe, translate, and understand conversations anywhere. Terms of service: https://soniox.com/company/policies/terms-and-conditions/ Privacy Policy: https://soniox.com/company/policies/privacy-policy/

About

Keystone

Features
Read full description

Keystone gives your projects room to breathe. Keep every project, task, and plan in one calm place, then focus on what matters today. SEE THE WHOLE PICTURE Scan your active projects in a single list. Give each one an icon, priority, and phase. Open a project to work through its tasks, fold completed work away, or archive it when it's finished. PLAN TODAY AND THE WEEK Choose the projects that belong in today's plan and schedule tasks for the day. Move to Week to see each day at a glance, plan ahead, and set recurring work days for a project. A Home Screen widget keeps today's work nearby. CAPTURE WORK QUICKLY Use the command bar to add a task to a project, schedule it for today, tomorrow, or a weekday, and set project priority. You can also add directly from an expanded project. Copy open tasks or share them as a Markdown file when you need them elsewhere. YOUR DATA STAYS YOURS Keystone works offline and syncs through your private iCloud when it's available. Export and import a full data backup from Settings, or save a separate iCloud backup. There is no Keystone account, advertising, or tracking. Built for iPhone. Simple enough to open every day.

Screenshots

Soniox4 screens
Keystone4 screens

Verdict

The call

The clearest difference is in-app purchases: Keystone at none against Soniox's 2. On price, update cadence, ads and device support 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. Soniox sells 2 in-app purchases, starting at $19.99 per month. Keystone asks for nothing beyond the download.

UpkeepUpdate frequency

Soniox ships an update every 10 days, Keystone fortnightly. The most recent releases landed on October 19, 2026 and October 7, 2026 respectively.

Scorecard1 real difference · 9 level
Soniox versus Keystone: the parameters behind the verdict, then further details
ParameterSonioxKeystone
PriceFreeFree
Rating4.7 (169 ratings) — better—
Positive reviews68.4% of reviews—
Number of ratings169 — better—
Update frequencyEvery 10 days — betterFortnightly
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPad — betteriPhone
Requires iOS16.4 — better17.0
Further details — not scored
Size64 MB4 MB
Age rating4+4+
DeveloperSoniox IncIonut Mocanu

In-app purchases

2 purchases

Soniox

Subscriptions2
  • Pro$19.991 Month
  • Pro$119.991 Year
None

Keystone

No in-app purchases

Questions

Is Soniox free?
Soniox is free to download, with in-app purchases available.
Is Keystone free?
Keystone is free to download, with no in-app purchases.
Do Soniox or Keystone have ads?
Neither Soniox nor Keystone shows ads.
Which is updated more often, Soniox or Keystone?
Soniox ships an update every 10 days, and Keystone fortnightly. Most recently, Soniox was updated on October 19, 2026 and Keystone on October 7, 2026.

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