Military-grade encrypted vault · 5-level Dead Man's Switch · Shamir Secret Sharing
Just In Case is a digital legacy and estate planning app that ensures your passwords, crypto wallets, documents, and final messages reach the right people — automatically — when the time comes.
The average person has 100+ online accounts. When you die or become incapacitated, every single one becomes a locked door with no key. Your family spends months fighting with customer support, submitting death certificates, and navigating bureaucratic nightmares.
Just In Case solves this with three innovations:
- Zero-Knowledge Encrypted Vault — Store everything with AES-256-GCM encryption. Even we can't read your data.
- 5-Level Dead Man's Switch — A progressive fail-safe that escalates from email → push → SMS → phone call before triggering.
- Shamir Secret Sharing — Your encryption keys are split so that no single heir can access your vault alone.
| Feature | Details |
|---|---|
| Encryption | AES-256-GCM with PBKDF2 key derivation |
| Architecture | Zero-knowledge — server never sees plaintext |
| Authentication | Face ID / Touch ID biometric |
| Storage | Passwords, documents, photos, notes |
Level 1 → Email reminder (configurable timing)
Level 2 → Push notification (escalation)
Level 3 → SMS alert (urgent)
Level 4 → Automated phone call (critical)
Level 5 → Vault delivery to heirs (final trigger)
At each level, you can respond and reset the timer. Only complete silence across ALL 5 levels triggers the final delivery. This prevents false alarms from vacations, hospital stays, or simply forgetting.
- Designate unlimited heirs with different access levels
- Shamir's Secret Sharing (k-of-n threshold scheme) — heirs must cooperate to decrypt
- Secure invitation via email with confirmation link
- Priority-based delivery (primary heir first, then secondaries)
- Write custom call scripts for each heir
- Automated phone calls via Twilio when DMS triggers
- Natural-sounding voices via Google Cloud TTS
- Multi-language: English, Chinese, Japanese, Korean, Spanish
- Schedule messages for future delivery
- Tie delivery to specific dates or DMS trigger
- Perfect for birthdays, anniversaries, or milestone messages
- Pre-configure social media account handling
- Instructions per platform: memorialize, delete, or post final message
- Covers Facebook, Instagram, Twitter/X, LinkedIn
- Secure storage for wallet seed phrases
- Shamir secret sharing for key distribution
- Step-by-step heir recovery instructions
- Supports Bitcoin, Ethereum, and all major chains
┌─────────────┐ ┌──────────────────┐ ┌─────────────────┐
│ iOS App │────▶│ Google Cloud │────▶│ Notifications │
│ (Flutter) │ │ Run (Go/Gin) │ │ │
│ │ │ │ │ • Twilio (SMS) │
│ AES-256 │ │ PostgreSQL │ │ • Twilio (Call) │
│ Encryption │ │ Cloud Storage │ │ • SendGrid │
│ Face ID │ │ DMS Scheduler │ │ • FCM (Push) │
└─────────────┘ └──────────────────┘ └─────────────────┘
| Component | Technology |
|---|---|
| Frontend | Flutter (iOS native) |
| Backend | Go (Gin framework) |
| Infrastructure | Google Cloud Run (serverless) |
| Database | PostgreSQL with encrypted fields |
| Object Storage | Google Cloud Storage |
| SMS & Voice | Twilio |
| SendGrid | |
| Push Notifications | Firebase Cloud Messaging |
| Payments | RevenueCat (App Store subscriptions) |
| Encryption | AES-256-GCM, PBKDF2, Shamir SSS |
- All vault items encrypted with AES-256-GCM before leaving the device
- Key derivation via PBKDF2 with device-specific salt
- No plaintext ever stored on server
- TLS 1.3 for all API communications
- Certificate pinning on iOS client
- Master key derived from user's biometric + device keychain
- Shamir's Secret Sharing splits the key into n shares (threshold k required to reconstruct)
- Individual shares distributed to designated heirs
- Server stores only encrypted blobs
- Server has no access to encryption keys
- Even database breach reveals only ciphertext
| Threat | Mitigation |
|---|---|
| Server compromise | Zero-knowledge — no plaintext on server |
| Single heir collusion | Shamir threshold — k heirs required |
| False DMS trigger | 5-level escalation over days/weeks |
| Man-in-the-middle | TLS 1.3 + certificate pinning |
| Device theft | Biometric + device keychain |
Free tier available — 1 heir, basic vault, 3-level DMS
Premium ($99 lifetime) — Unlimited heirs, full vault, 5-level DMS, Voice Testament, Time Capsules, Crypto Vault, Digital Afterlife
How is Just In Case different from a password manager?
Password managers store your passwords but don't solve the inheritance problem. When you die, your family can't access your password manager either (master password + 2FA). Just In Case adds a Dead Man's Switch that automatically delivers your information when you can't.
What if I just forget to check in?
The 5-level escalation system prevents false triggers. You'll receive an email, then a push notification, then an SMS, then a phone call — over days or weeks. Only if you fail to respond to ALL five levels does the switch activate.
Can you read my data?
No. Just In Case uses a zero-knowledge architecture. Your data is encrypted on your device before transmission. We never have access to your encryption keys. Even a full database breach would reveal only encrypted ciphertext.
What about crypto wallets?
Your seed phrases are stored in the encrypted vault and can be split using Shamir's Secret Sharing across multiple heirs. No single heir can access your crypto alone. The system includes step-by-step instructions for heirs who may not be crypto-savvy.
What happens if Just In Case shuts down?
We have a continuity plan that includes open-sourcing the decryption tools. Your encrypted data is stored on Google Cloud with redundant backups. The encryption is standard AES-256 — any implementation can decrypt it with the correct key.
- 🌐 Website: justincase.vip
- 📱 App Store: Download
- 📝 Blog: justincase.vip/blog
- 🤖 LLMs.txt: justincase.vip/llms.txt
- 📧 Contact: support@justincase.vip
Just In Case is a proprietary application. This repository contains documentation and security specifications — not the application source code.
© 2026 Just In Case. All rights reserved.