Proton Drive vs CalcLock

Start with the job you need done

Proton Drive advertises end-to-end encrypted photo storage, albums and automatic photo and video backup on iOS and Android. It also documents sharing links with passwords, expiration and revocation controls. CalcLock offers a working calculator with equation-accessed local storage, rather than a cloud photo service.

Follow the files beyond the unlock screen

Backup is the decisive difference if the phone may become unavailable. Proton’s described workflow uploads photos to its cloud account. CalcLock’s local device-bound encryption does not create a recoverable cloud copy. Whichever service you choose, confirm actual completion and access to a copy before changing or erasing the source device.

Make the practical tradeoff explicit

Think about the recipient as well as the sender. If the task is to send an album to someone, a product with a documented sharing workflow addresses that task directly. A local vault without export cannot be treated as a staging area from which you will later send files. Plan the shareable originals separately from any copy you import into CalcLock.

Test the complete workflow with harmless files

For a trial, back up a few harmless files and check them through the account route you intend to use on another device. If using a shared link, review its audience and expiry before distributing it. Revoking a link should never be treated as a way to retract screenshots or copies already made by a recipient. Keep that real-world limit in mind when deciding what to send.

What CalcLock actually provides

CalcLock imports photos, videos and files into an equation-specific local vault and includes audio playback. The first equals press calculates; a second consecutive equals press opens the matching collection. Matching the numerical answer is not sufficient: the configured expression itself matters.

AES-256-GCM protects the stored files and manifest using a secret held in the device Keychain. This implementation has not had an independent security audit. CalcLock provides no export, sharing, sync, backup restoration or forgotten-equation recovery. Keep independent originals and do not rely on a new phone or reinstall to recover the vault.

Source and scope

Reviewed 11 November 2026. Published by CalcLock. Alternative-product features above are described by the linked official source, not independently tested here. This is a workflow comparison, not a claim of equal cryptographic design or a security ranking. Check the current app, account requirements and plan before committing important files.