Privacy Policy - AudioJoin

AudioJoin - Merge and Trim Audio Files

Last updated: November 5, 2026

This Privacy Policy is provided in English only.

Introduction

This Privacy Policy describes how AudioJoin (“we”, “our”, or “the app”) handles your information when you use our mobile application.

Information We Collect

1. Analytics Data

The app uses Firebase Analytics to collect anonymous usage data to improve the app experience:

• Which screens and features are used, and how often
• Device type and operating system version

This data is tied to a per-install identifier, never to an account. The app has no login. It cannot be used to identify you personally, and it never includes your audio, your file names, or anything you typed.

2. Local Data

The following stays on your device and is never transmitted anywhere:

• The audio files you import, and the copies the app makes of them while you edit
• Your clip order and the trim points you set
• The files you export

Imported copies live in a temporary folder and are removed when you remove the clip or the system clears that folder.

File Access

The app opens audio only when you choose it, either through the file picker or by sharing a file into AudioJoin from another app such as Voice Memos. On iOS, a file shared into AudioJoin is placed in a private folder that only AudioJoin and its share extension can read. On Android, the app receives shared audio through the system share sheet and uses the system file picker, so it asks for no storage permission.

All audio processing happens entirely on your device. Your recordings and their contents are never uploaded to our servers or to any third party.

Information We Do NOT Collect

• Personal information (name, email address, phone number)
• Location data
• Contacts, photos, or any data outside the audio files you pick
• The contents of your audio, or the names of your files
• Advertising identifiers

Third-Party Services

Our app uses the following third-party service:

• Firebase Analytics (Privacy Policy)

The app includes the LAME MP3 encoder as an open source library so it can write MP3 files. It is a library, not a service: it runs on your device and sends nothing. See Open Source for its license and source code.

Advertising

AudioJoin does not display any advertisements. We do not use any advertising SDKs.

In-App Purchases

AudioJoin offers one optional upgrade, AudioJoin Plus, that unlocks joining three or more clips, adding a fourth track and more, shortening long silences, and exporting as MP3 or WAV. Trimming, three tracks, joining up to two clips, and saving as M4A are free and always will be.

On iPhone and iPad, Plus is a 1-year auto-renewing subscription or a one-time lifetime purchase. On Android, it is a one-time purchase. If you already bought Plus, you keep it. You can cancel a subscription at any time in your App Store account settings.

Purchases are handled entirely by Apple (App Store) or Google (Google Play). We never see or store your payment details. The app only receives, and keeps on your device, whether your purchase or subscription is active.

Data Security

Your audio never leaves your device: there is no transmission to secure and no copy of it on any server we run. Files are protected by your device’s own storage protections. The anonymous usage events described above are sent over an encrypted connection to Firebase.

Children’s Privacy

Our app is not directed to children under 13. We do not knowingly collect personal information from children under 13.

Your Rights

• Your files stay yours: deleting a clip removes the app’s copy of it, and deleting the app removes everything the app has stored. Your original files stay where they were.
• Delete local data: uninstalling the app removes all locally stored data and stops all analytics collection
• Limit tracking: you can manage app tracking and analytics permissions in your device’s privacy settings

Changes to This Policy

We may update this Privacy Policy from time to time. Changes will be posted on this page with a new “Last updated” date.

Contact Us

If you have any questions about this Privacy Policy, please contact us at:

Email: support@mongdaewon.com