Dead man's switch 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.