サブスク遺言書 - サブスクなどのアカウント管理

In the event of your death, will your smartphone, online assets, and family be able to inherit them?

The most difficult aspect of modern estate settlement is "digital inheritance."

- Unable to unlock the smartphone

- Unaware of ongoing subscriptions leading to continued charges

- Family members are unaware of the existence of online banking or securities accounts…

"Subscription Will" is a completely new end-of-life planning tool that protects important information with advanced encryption technology and entrusts it to family members as a reliable "paper medium."

【Five Design Features that Support Trust】
1. Primarily operates offline

🛡️ Registered data is never sent to external servers. The risk of leakage from the communication path is physically blocked.

*Minimal communication may occur on the OS side for license verification, etc., but user registration data is never transmitted.

2. Protection with standard encryption technology

🔐 In addition to "AES-256-GCM" encryption, 600,000 iterative calculations (PBKDF2) are applied to key generation. This design makes decryption difficult within a realistic timeframe against typical brute-force attacks by computers.
3. App-Independent Recovery Method
📄 Data is stored as a "paper QR code" rather than in the cloud. The PDF contains the necessary technical specifications (decryption recipe) for recovery, ensuring that even if this app is discontinued in the future, the information can still be recovered using IT professionals or alternative tools.
● General-Purpose Recovery Tool: An "HTML recovery tool" that works solely in a browser can be exported.
4. "Digital Sovereignty" - Even Developers Cannot View
👤 Because it has no external servers and no communication capabilities, even developers have no way to access user data. A "key" set by the user is required to decrypt the data.
5. Thorough Privacy Protection
🚫 Input data is stored in the encrypted storage (Keystore) provided by the Android OS. Furthermore, screenshots and screen recordings within the app are restricted at the system level to minimize unintended information exposure.

【Main Security Features】
● Individual PDF Creation for Each Recipient: You can separate the information you share with each recipient.
● Camouflage (Decoy) Function: Even if you are strongly pressured to disclose information, you can hide the real information by entering a "dummy answer" and displaying the prepared dummy information.
● OCR (Optical Character Recognition) Support: ID reading via camera is completed within the device. Images are never sent externally.
● Organization Function: You can easily rearrange service names and check for duplicates.

【Recommended for those who:】

・Use online banking, securities, etc.

・Have many paid subscriptions

・Prioritize privacy and are hesitant about cloud storage

・Want to ensure important information reaches family members who are not tech-savvy

【Simple to Use】
1. Enter the service name, ID, and hint
2. Create an encrypted PDF and print it (or save it to a USB drive, etc.)
3. Simply handwrite the password on the printed "key card" and store it.

【Developer's Vision】 This app was born from the desire to "prevent family members from having problems." Digital assets are a black box that no one can access without your "will." To prevent your loved ones from getting lost, why not start a new form of will today?

【Pricing】 This is a "one-time purchase" with no ads or additional charges. You can use it with peace of mind without worrying about running costs.


[Disclaimer]
While this application has been designed with the utmost care and advanced security features, the developers assume no responsibility whatsoever for unexpected information leaks due to the user's device environment (malware infection, OS vulnerabilities, etc.) or loss or theft of printed materials, and for any resulting damages. Please be sure to manage your recovery password (key) and printed materials with the utmost care.