Your Final Message.
Delivered When It Matters.
Receive gentle email check-ins. If you stop replying, your messages are delivered by email to the people you choose. Your words stay private with end-to-end encryption. A self-hosted dead man's switch for delivering encrypted messages to your loved ones — when you're gone or unresponsive.
You
Write message
Server
Can't read it
Recipient
Reads message
What it does
A quiet promise, delivered by email.
LastSignal checks in with you by email. If you stop replying, it delivers your encrypted messages to your loved ones.
Everything stays private by default, even from the server — you control the timing, recipients, and content.
Email check-ins
Gentle reminders
Encrypted delivery
Only they can read it
Loved ones
Receive at the right time
Open Source
BSL 1.1 licensed, fully auditable
Self-Hosted
Your server, your data
Zero-Knowledge
The server can't read your messages
End-to-End Encrypted
Military-grade cryptography
How It Works
Three simple steps to protect what matters most. No complicated setup, no technical knowledge required.
Invite Recipients
Add recipients by email. They'll create a secret passphrase that only they know — the server never sees it. This passphrase is the key to unlock your messages.
Write Your Messages
Compose messages for the people you care about. Everything is encrypted in your browser before it ever touches the server. Only your recipients can read what you've written.
Stay Active
Respond to periodic check-ins to confirm you're okay. If you stop responding, your messages are delivered automatically. Simple as that.
What if you miss a check-in?
No need to panic. You'll receive multiple email reminders. After missing check-ins, there's a grace period, then a cooldown window where you can cancel delivery with one click. You can also add a Trusted Contact who can confirm you're alive but unreachable, delaying delivery by your chosen amount.
Built for Privacy, Designed for Humans
Every feature is designed with security and simplicity in mind. No compromises, no complexity.
Client-Side Encryption
Your messages are encrypted in your browser using industry-standard algorithms. The server only sees encrypted data it cannot decrypt.
Passwordless Login
No passwords to remember or steal. Sign in securely with a magic link sent to your email. Simple, secure, and hassle-free.
Flexible Timing
Set your own check-in schedule — daily, weekly, or monthly. Adjust grace periods and cooldowns to fit your lifestyle.
Panic Button
Changed your mind? Cancel delivery anytime during the cooldown period with a single click. You stay in control.
Complete Audit Trail
Every security-relevant action is logged. Know exactly what happened and when, without compromising your privacy.
Docker Ready
Deploy in minutes with Docker. All you need is an SSH-enabled server and a reliable SMTP provider.
Built on Proven Cryptography
LastSignal uses the same encryption trusted by security professionals worldwide. Your messages are protected by XChaCha20-Poly1305 and Argon2id — algorithms designed to resist even the most sophisticated attacks.
- Messages encrypted before leaving your device
- Private keys never touch the server
- Decryption happens entirely in recipient's browser
a5c8e2f1b4d7a9c3
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... (encrypted)
Frequently Asked Questions
Got questions? Here are answers.
No. There is no business model, no paid product, and no managed service. LastSignal is open-source software you run yourself. We do not host it, operate it, or monitor it for you. It is provided as-is, without warranties or guarantees; bugs may exist. You are solely responsible for configuration, data, recipients, legal compliance, and any consequences of use.
There is no managed service, hosting, or paid plan. You run it on your own server. If you'd like a quote for consulting help with setup, customization, troubleshooting, or deployment, email [email protected].
No. Messages are encrypted in your browser before being sent to the server. The server only stores encrypted data and doesn't have the keys to decrypt it. This is called "zero-knowledge" architecture.
You'll receive a recovery code when you first sign up. Store it safely — you can use it to stop message delivery even without email access. Think of it as your emergency backup.
Unfortunately, there's no recovery option — that's the trade-off for true security. The passphrase is the only way to decrypt messages. Recipients should store it in a password manager.
LastSignal is fully open source. Security researchers can audit the code, and you can verify the client-side encryption yourself. The security model is documented in detail on the Security page (./security/).
Don't worry. You'll receive multiple email reminders. After missing check-ins, there's a grace period, then a cooldown period where you can cancel delivery with one click. You have plenty of time to respond.
A Trusted Contact can confirm you are alive but temporarily unreachable during grace or cooldown. Each confirmation delays delivery by the amount you choose. They cannot read messages or access your account.
Yes. You can set ALLOWED_EMAILS to a comma-separated list, and only those addresses can request magic links.
Absolutely — that's the whole point! LastSignal is completely free and fully self-hosted. All you need is a server with SSH access and a reliable SMTP provider. Full instructions are in the README. Your data stays on your server.
Use Cases
Real-world ways people use LastSignal to protect sensitive information and share it at the right moment.
Family planning ahead
Family Emergency Instructions
Leave clear steps for loved ones: contacts, documents, and immediate actions to take if you’re unavailable.
Executor playbook
Executor & Legal Guidance
Share private notes for an executor: where to find documents, who to contact, and how to proceed.
Protected disclosure
Whistleblower Safeguard
Release documentation or a tip only if you miss check-ins, ensuring sensitive disclosures reach trusted recipients.
Bitcoin recovery plan
Bitcoin Wallet Recovery
Leave Bitcoin wallet recovery instructions so your children can access it when it matters most.
Operational continuity
Founders & Projects
Hand off repositories, keys, and operational playbooks so a co-founder can keep a project running.
Care team clarity
Medical & Care Notes
Provide critical medical context and care preferences to trusted family or caregivers.
Remote life safety net
Travel & Remote Work Safety
Use check-ins as a safety net. If you miss a window, your message automatically goes out.
Creative legacy
Creative Work & IP Handover
Deliver unpublished work, licenses, or creative intent to collaborators or family.
Personal closure
Personal Farewell & Legacy
Leave a final message that reaches the right people at the right time—private and protected.
Take Control of Your Digital Legacy
Your final words deserve to be protected. LastSignal ensures they reach the right people, at the right time, with uncompromising privacy. And it's completely free and open source.
BSL 1.1 License • No tracking • No vendor lock-in