Phone app

Codebook logo Codebook is a secure notebook for for iPhone, iPad, and iPod Touch that protects your sensitive information with 256-bit AES encryption.

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Do you need a place on your iPhone to keep secrets? An app where you can store sensitive meeting notes, ideas for a new project, or questionable poetry? If you lose your iPhone or iPod Touch, you can count on Codebook to keep your secrets safe.

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Ease of Use

Familiar and uncluttered, Codebook offers a simple interface for finding and editing notes. Optionally order notes by creation or update time. Email notes from inside the application. Check out our tour to learn more.

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Peace of Mind

Unlike some of the diary apps out there, Codebook doesn't cut any corners, encrypting every piece of information you enter. No one will read your secrets if you leave it in a cab.

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High Security

Lots of applications make poor choices when implementing tough encryption algorithms that can leave your data exposed. We didn’t roll our own, Codebook uses OpenSSL’s peer-reviewed implementation of 256-bit AES encryption. In addition, we protect your password using PBKDF2 to make brute force attacks even more difficult. This is security you can trust.

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Affordable and Reliable

Codebook is not only an affordable solution to securing your notes and ideas- it also maintains one of the highest customer ratings available in the iTunes App store.