Muon: AI Voice Recorder, Notes
Stop recording. Start reading.
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.
The moment you stop recording, your words are already readable. Meetings, lectures, memos—transcribed and summarized by AI. Recording from Apple Watch and Lock Screen.
Speech, made readable.
Muon sits between Voice Memos and meeting transcription services. Record meetings, lectures, and memos—the moment you stop recording, AI gives you a readable transcript and summary. Designed with deep integration across Apple's ecosystem: Apple Watch, Action Button, Live Activity, Lock Screen.
■ Key Features
・High-accuracy AI transcription
・AI-generated summaries that extract what matters
・Recording from Apple Watch
・Live Activity (Lock Screen and Dynamic Island)
■ Built for the Apple Ecosystem
Tap your wrist to start recording. Tap again to stop. One press of the Action Button starts a new recording. Elapsed time and status stay visible on the Lock Screen. Whether recording or processing, Muon is always one glance away—on iPhone or Apple Watch.
■ What It's For
・Meeting minutes
・Lectures and seminar notes
・Interviews and reporting
・Daily voice notes
※ Transcription accuracy may decrease in noisy outdoor environments or for long-form lifelog-style recordings. Muon is optimized for clear speech in quiet environments.
■ Privacy
Audio is stored only on your device. During transcription and summarization, data is temporarily sent to cloud services; no audio is retained on the service side after processing.
■ Pricing
The first 3 days after install include full access to all features at no cost. After the trial, continued recording requires a subscription:
・Monthly plan: $6.99 / month
・Annual plan: $54.99 / year (34% off monthly)
After the trial, previously recorded data remains playable and viewable without a subscription. Only the creation of new recordings is locked.
Subscriptions auto-renew. Unless canceled at least 24 hours before the renewal date, the same plan renews automatically. Cancel anytime from iOS Settings → [Your Name] → Subscriptions.
■ Usage Limits
・Per recording: up to 90 minutes (auto-stop)
・Monthly total: up to 30 hours
■ Supported Languages
Japanese, English
■ Links
Terms of Service: https://renalne.com/legal/muon/terms/en
Privacy Policy: https://renalne.com/legal/muon/privacy/en
Contact: https://form.run/@renalne-contact
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
A small refinement to how Muon is described on the App Store.
The app itself is unchanged this time.
The developer, ReNALNE.inc, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- RENALNE K.K
- Size
- 10.5 MB
- Category
- Productivity
- Compatibility
Requires iOS 26.0 or later.
- iPhone
Requires iOS 26.0 or later. - Mac
Requires macOS 26.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 26.0 or later. - Apple Watch
Requires watchOS 26.0 or later.
- iPhone
- Languages
- English and Japanese
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Muon Pro 月額 $6.99
- Muon Pro 年額 $54.99
- Copyright
- © 2026 ReNALNE K.K.