Dead man's switch app

In-app purchases
Content rating
Everyone
100+
Downloads
Content rating
Everyone
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About this app

DMS lets you create an encrypted "package" on your device that is then uploaded and stored securely in the cloud*. A package consists of a recipient email address, a message, attachments, and a passphrase hint.

Delivery of your package occurs when there is no detection of user presence. Your recipient is contacted by email and given a unique link and your passphrase hint. They can download your package through an ordinary web browser.

Detection is determined by Steps, Email, or SMS†. As long as you’re moving, you’re considered "present". If no movement is detected, we’ll Email or SMS you to confirm‡. If you are absent, your package(s) will be delivered.

User Manual: https://deadmanswitch.com/ca/en/user-manual
Don't Trust, Verify: https://github.com/deadmanswitch

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* User content is protected with end-to-end encryption; however, certain operational metadata is necessary for storage, retrieval, and decryption.
† Detection by SMS available only in North America. Standard message and data rates may apply.
‡ Functionality requires internet connectivity and access to third-party networks/services. Availability is dependent on local network conditions and government policies; in some jurisdictions connectivity may be degraded, restricted, or blocked (including, without limitation, the People’s Republic of China, Sudan, Iran, and the Democratic People’s Republic of Korea). You are solely responsible for obtaining data connectivity and complying with all applicable laws.
Updated on
Feb 17, 2026

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
No data shared with third parties
Learn more about how developers declare sharing
This app may collect these data types
Personal info and Photos and videos
Data is encrypted in transit
You can request that data be deleted

What’s new

- In this version we’ve updated all dependencies in the mobile application.
Content rating
Everyone
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App support

About the developer
Deadmanswitch.com, Inc.
contact@deadmanswitch.com
200-150 King St W Toronto, ON M5H 1J9 Canada
+1 438-889-8050