But there are other ways to track down data in Projectbook. Tap a keyword in one of your notebooks, for example, and a pop-up window will display the other files you've stored in Projectbook that contain that word. A Show Similar Notes option in Projectbook finds documents that are similar to the one you're already working on, based on keywords. Every folder and tag in ProjectBook has a Related Notes folder that can summon similar notes and documents. And you can set up an Active Folder in ProjectBook; similar to OS X's Smart Folders, Active Folders organize information that matches a specified search term.

"We invested heavily in natural language technology that's optimized for note-taking," Tamte says. That technology can parse the meaning of content in your documents, allowing the app to recognize related files.

As for Projectbook's task-manager tools, the app has a Make To-Do button that can convert an item in your notes to a to-do. If you type Assignment due in two weeks, the app is smart enough to create that to-do with a due date two weeks from now. You can attach related notes to a project, and use the app's indent button to add sub-tasks and to-dos.

Two task-management features in Projectbook struck me as particularly impressive. When manually assigning to-do dates for tasks, the app eschews the traditional iOS scroll wheel for buttons like +1 Day and +1 Week. (The scroll wheel will appear, if you look for it.) An Advance Notice button also lets you set reminders to get started on a task before it's due. When forwarding emails to the app, if you add TD: to the subject line, Projectbook is smart enough to convert that email into a to-do item. "It gets tasks out of your email and onto your to-do list," Tamte says.

After my brief time with Projectbook, the app struck me as a combination of a note-taker like and an information manager like with any one of the App Store's multitude of to-do managers thrown in. Tamte has a bigger rival in mind though: . That note collector's claim to fame is its ability to sync notes across multiple devices. Tamte argues that such capability is of limited use if you're not connected to a network or if your connection is unreliable. Projectbook's approach is to put the information people need in one place.