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Codebook - Secure Notebook

By Zetetic LLC

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Codebook is a highly rated secure and encrypted notebook application. It protects your secret notes, ideas, and personal information from unauthorized access by would-be crackers, malicious thieves and snoopy coworkers. Codebook keeps your information secure, yet always at your fingertips.


"Don't waste your time or money on similar apps. This one tops them all. Trust me" - App Store Review
"I've tried other secure file apps and this one works the best" - NJAPilot
"Support rocks! ...These guys set the customer service bar pretty high... Big props to Codebook!" - Mark in Cali


✓ 256-bit AES Encryption and secure password protection for 100% of your data
✓ Full text searching and sorting by last edit or create
✓ Search for text and jump to location within a note
✓ Easy first-line document naming
✓ Quick copy / paste between applications
✓ Elegant and easy to read fonts
✓ Native look and simple to use interface that is similar to built-in iPhone Notes application
✓ Email notes directly from inside Codebook
✓ Auto-saves notes to avoid loss due to application interruptions
✓ Backup and multi-device synchronization using DropBox (no longer requires in-app purchase)
✓ Email notes as password-encrypted PDF files


Codebook is the only secure notebook that uses open source, peer-reviewed full-database encryption technology. Called SQLCipher, the data store for Codebook uses established security practices like CBC mode encryption, PBKDF2 key derivation, randomized initialization vectors, and unique per-database salts. It further takes advantage of the widely trusted and peer-reviewed OpenSSL for cryptographic functions.

Even if you don't understand what all this security jargon means, you can rest assured that *we* do. Can you say the same about other notebook apps? Learn more at

What's New in Version 1.6.4

* FIXED: Setting for pasteboard, "Clear on Exit," could cause crash when leaving application when enabled
* FIXED: Application could crash during login after resuming active status
* FIXED: Deprecated Dropbox API call could create duplicate codebook.db files on sync
* NEW: Support for four-inch Retina display
* NEW: Backgrounds updated to better match iOS 6 feel, dropped brushed metal and paper backgrounds
* NEW: Updated SQLCipher encryption engine to version 2.1.1
* NEW: Ends support for iPhone 3G and armv6 devices, minimum supported iOS version is now 4.3
* FIXED: Clipping on start sync button

iPhone Screenshot

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Customer Reviews

very useful!!

I found this app after looking long and hard for a place to securely store information. I have found it to be almost exactly what I want and like that in addition to the itunes backup, it is backed up, if desired, as an encrypted folder in dropbox (which of course is also then encrypted again on their server). Some suggestions would be (as some other apps do that I did not like for other reasons): 1)to be able to have the app recognize a phone number which could be called, or an e-mail address which could then be used. This would be useful for those that I don't want to keep in the COMPLETELY un-secure contacts app (especially after the recent disclosure that third parties were accessing and storing OUR contact info on their sites!), 2) to have the app automatically reorder the notes into alpha numeric order when going back to the list or to have a sort button. I noticed that the most recently opened app remains on the top until one hits sync, at which time the notes are ordered alpha-numerically, 3) to have an alphabet on the right side similar to contacts, if alphanumeric sorting is chosen. this would make it easier to go to the note of choice quickly, 4) to put the mask option in the preferences, where I think it belongs. All in all however, I find this to be a really good app!! Just remember your password or you are toast! No way to recover for security reasons.

Solid Secure App

Great app! Exactly as advertised. Very secure. One of the best features is the encryption. Back up to Dropbox & no one can access my notes even from computer. It would be nice to have folders to sort entries into since I use it for anything I want kept private but ....I like the fact that the designers are focused on giving the best security before they add on the upgrades. My 5 rating is for a good solid, secure app. Keep up the good work!

Great App, but...

One quirky, longstanding bug remains even after iOS 8 arrived.

Copy-Paste between Codebook and other Apps stopped working at some point — but only for documents created after some past, yet-to-be-identified update.

Copy-Paste between my oldest Codebook documents has been working, but not between newer Codebook documents and other Apps.

To fix this problem:

In Preferences, temporarily turn off "Pasteboard: Clear on Exit." Quit the App and delete it from Apple's background mode. Then re-launch the App and Copy-Paste works again in all Codebook documents and with other Apps.

But if you again turn on "Pasteboard: Clear on Exit" — Codebook Copy-Paste between newer documents and other Apps stops working again!

This traps data inside Codebook.

Codebook - Secure Notebook
View In iTunes
  • $3.99
  • Category: Productivity
  • Updated:
  • Version: 1.6.4
  • Size: 4.5 MB
  • Language: English
  • Seller:

Compatibility: Requires iOS 4.3 or later. Compatible with iPhone, iPad, and iPod touch. This app is optimized for iPhone 5.

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