The one competitor that does not stop at the phone
Almost every app in this category is a phone app, which is why cross-platform is usually the shortest argument we can make. Folder Lock is the exception, and it is worth saying so plainly rather than pretending otherwise. Its own listing calls it a cross-platform data security application, it encrypts rather than merely hides, and it covers Windows and Android alongside its iOS app.
So this comparison is not about reach. It is about what the encryption is attached to, and what using the app is actually like.
Named ciphers and unnamed ones
Folder Lock's listing says it locks and encrypts files and syncs them to Google Drive, Dropbox and OneDrive. It does not name a cipher, so there is nothing published to compare against on the specific question of how the encryption is done.
Vaultine names it: AES-256-GCM, applied per file, on the device, before anything is written. The stored data is split and randomised so nothing on disk resembles the original, and the key is derived from your 5x5 pattern or six-digit PIN and never stored. We hold no keys, which means we cannot decrypt your files even if asked.
What its own reviewers report
Two themes dominate recent negative reviews, and they pull in opposite directions from what a security app is for.
The first is losing files — the single most common complaint. The second is ads, raised in roughly one in six negative reviews, in an app people chose to protect private material.
Vaultine's answer to the first is structural: your files are encrypted on your device, and backup is optional and goes to a Dropbox account you own, so there is no company sync in the middle to lose them. The answer to the second is simply that there are no ads on any tier, and no ad SDKs in the app.
When you are made to unlock it
A lock protects you from someone who does not have your password. It offers nothing when the person in front of you is waiting for you to type it.
Vaultine's Decoy Vault opens on a second code and shows a vault you stocked in advance with harmless files, so you decide what is seen. The Duress Vault opens on a third code, shows an empty vault, and wipes your real vaults as it does. Both are Pro features and both are prepared deliberately by you — and because Vaultine rejects any code it does not recognise, the vaults on your device are exactly the ones you created.
