Vaultaire

Vaultaire encrypts your photos with AES-256 using a key derived from a pattern you draw on a 5x5 grid. Each pattern opens a different vault, and a wrong pattern opens an empty one instead of an error, so no one can prove other vaults exist. A duress pattern opens a decoy and wipes the rest. No account, no server, analytics off by default. iOS only. Free tier includes 5 vaults and 100 files; Pro is $1.99/week, $19.99/year, or $39.99 lifetime.