Vaultaire vs Safe Lock

機能比較

Vaultaire：17/17項目。Safe Lock：5/17項目（1つは部分対応）。

料金比較

Cloud Backup Without Encryption

Safe Lock offers cloud backup as a premium feature. This sounds like a data safety improvement -- until you examine what is actually being backed up. The photos are uploaded to cloud storage without end-to-end encryption. The cloud provider can read them. An attacker who compromises the cloud account can view them. A subpoena to the cloud provider can obtain them. The backup feature creates a second copy of your private photos in a location with weaker access controls than your device.

Vaultaire encrypts files before they leave the device. iCloud backup transmits only AES-256-GCM ciphertext. Apple's servers store encrypted blobs. A compromised iCloud account reveals nothing readable. A subpoena returns ciphertext. The backup improves data durability without degrading data confidentiality. This is the correct way to implement cloud backup for sensitive data.

PIN vs. Pattern as Authentication

Safe Lock uses a numeric PIN for access control. A 4-digit PIN has 10,000 possible combinations. A 6-digit PIN has 1,000,000. These are small keyspaces, vulnerable to brute-force attacks. More importantly, the PIN only gates access to the app's UI -- it does not derive an encryption key. The PIN is a lock on a door; break the door frame (access the file system), and the lock is irrelevant.

Vaultaire's visual pattern serves a dual purpose: it authenticates the user and it derives the encryption key via HKDF-SHA256. The pattern's keyspace is substantially larger than a numeric PIN, and critically, the pattern is not just an access gate. Without the correct pattern, the correct encryption key cannot be computed, and the data remains ciphertext. The authentication mechanism and the cryptographic protection are the same thing.

Data Portability

Safe Lock users report losing photos during device transfers, iOS updates, and app reinstallation. Without encrypted backup, the hidden photos exist only in the app's local sandbox. When that sandbox is deleted -- through uninstallation, a failed update, or a device wipe -- the photos are gone permanently. There is no recovery mechanism, no export path that preserves privacy, and no way to migrate data safely between devices.

Vaultaire provides multiple data portability paths. Encrypted iCloud backup handles automatic device migration. The BIP-39 recovery phrase enables manual vault restoration on any device. Encrypted vault sharing allows you to transfer vaults between users or devices with end-to-end encryption. The data is portable because it is encrypted -- you can move ciphertext anywhere without compromising confidentiality.

緊急保護機能の不在

Safe Lock provides no duress vault, no plausible deniability mechanism, and no way to protect your data under coercion. If someone forces you to unlock the app, every hidden photo is immediately visible. There is no secondary vault that can be sacrificed, no trigger that wipes sensitive data, and no way to demonstrate that you have nothing to hide when you do.

Vaultaire's duress vault is designed for exactly this scenario. A separate pattern opens a decoy vault while silently destroying the real vault's key material. The attacker sees a vault with innocuous content. The sensitive vault becomes permanently inaccessible. There is no forensic trace that another vault existed, because the key material is gone. This is plausible deniability implemented at the cryptographic level.