Microsoft Office bundled note-taking software. OneNote is available for Windows, Mac OS, iOS, Android, Windows Phone, and Symbian.
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Pro Notes can be structured in text boxes
OneNote allows you to arrange text freely on the digital paper mimicking the way it would be done with a real pen on real paper.
Pro Powerful table editor
Adding and resizing rows and columns is easy and flexible. This makes for an easy way to adjust a note as it grows in content size.
Pro It's free on all platforms with free cloud sync
OneNote is available for free as a web app as well as natively on iOS, Android, OS X, and Windows. You can also use OneNote for free on as many devices as you want.
Pro Comprehensive organization methods
Notes can be arranged in sections and pages. This makes it a lot easier to organize ones content in a way that is easily navigable and readable.
Pro Stylus and digitizer pen support
OneNote can be used on all touch capable devices via stylus or digitizer pen making for an intuitive and easy way to take notes by hand, which can often be faster or just preferred over typing.
Pro Integrates with other Microsoft services
Integrates well with Outlook, Office, and OneDrive.
Pro Sharing and collaboration
You can share your notes by inviting people with an e-mail, or by giving them a direct URL. You have control over what kind of access the user has on your note (read only, edit) and can revoke it at any time.
OneNote will alert you when a chance in made on your shared note.
Pro Collapsable bulleted list
Makes it easy to quickly look at the high level of notes, and then drill deep into each point.
Pro Offers flexible encryption
Unlike most other apps, you can selectively password protect, and fully encrypt, individual documents or entire folders. This is especially important to many people with data stored in the cloud. As of early this year, even the free version supports encryption. Microsoft has also enhanced their internal security methods for storing data on OneDrive (where OneNote performs sync), which makes it more secure than most of their competitors (including Evernote).
Pro Lots of options for customizing fonts
You can fully customize your default font (the color, type of font, and font size). You can override this styles with the same options (and more) in individual notes.
Pro Very similar design for those used to Microsoft programs
If you have experience with other Microsoft programs such as Microsoft Office, you'll feel right at home with the design of OneNote thanks to the similarity of the menus.
Pro Large variety of themes available
You have quite a few options for themes available with illustrated backgrounds. If you want something a bit more simple while still having personality, there are also several color themes.
Pro Add notes through email
You can choose what notebook the notes will save to. E-mail notes to your special Onenote e-mail and it will be accessible across all devices.
Pro Insert files into your notes
You can add a variety of different files into your notes including images, video, audio, and more.
Pro On Android, you can tap a badge to start a note
The badge on Android hovers over on your screen similar to Facebook Messenger's Chat Heads. You can tap it and instantly start jotting down your thoughts without having to flip to the app first.
Pro Strong search features let you quickly find what you're looking for
If you don't want to search through all of your notes, you can narrow it down by specifying the page, section, group, or notebook.
You're not limited to just searching through your text either. You can search for text in images, video recordings, and audio (this is off by default).
Pro Notes can be organized into three different levels
A strong organizational feature is the ability to create 2 levels of subcategories.
For example, you could have a Notebook stack of "Recipes", a notebook for "Desserts", and then have pages for brownies, chocolate cheesecake etc.
Con Not available for Linux
There is no native Linux client for OneNote available, and most likely will never be created. Users can use the web based client, but a native app would be a better choice for those that use the app frequently.
Con Not free/libre
This application is proprietary, and thus cannot be modified or freely distributed.
Con Platform dependent
OneNote for Mac for example is very different from OneNote for Windows. Because Microsoft has a vested interest in making sure the Windows version is superior, the Mac version tends to lag behind in terms of functionality. Tutorials and other forms of documentation available online generally apply only to the Windows version, which implies non-Windows versions are undocumented.
Even worse, because the documentation rarely, if ever, indicates it only applies to Windows, it's easy to waste hours trying to make non-existent features work. As such, the documentation is "negative documentation" (i.e. worse than no documentation at all).
Con Text editing is weird (poor UX)
When clicking in the middle of a note, it adds something like a text-box positioned in the middle. If you move that field to the bottom right, it gets weirder. You can end-up with an empty note, having an empty text-box 1km to the bottom-right of it.
Con Sync isn't stable
Many users have reported synchronization issues. While not everyone will experience this, it can be difficult to troubleshoot, with some fixes resorting to editing registry keys in Windows when using the Windows client.
Con Copy/paste of text into other apps is pasted as image rather than text
Con Menu/ribbon can feel crammed
OneNote offers a lot of formatting options, which results in a lot of options being crammed into the ribbon. It can feel somewhat cluttered and takes a bit of time to get used to.
Con Requires a Microsoft account
You need to have a Microsoft email to sign up for OneNote (Outlook, Hotmail, or Windows Live).
Con Uninspired, bland user interface
Many of OneNote's competitors use Material Design and bold colors to create a minimal, clean looking interface.
OneNote has a bit more of an outdated look and can feel over crowded at times.
Con The added flexibility means your notes may feel cluttered
Since you can place elements anywhere you'd like on your note, you have to pay attention to how you structure it. For some this added flexibility is a huge selling point, but for others it could become distracting and makes notes feel difficult to digest.
Con You cannot use local OneNote files with the version of OneNote that is included with Windows
There is a difference between the OneNote that is included with Windows 10 and the OneNote that comes with Microsoft Office. The version included with Windows cannot use local OneNote files and requires you to be online to access your notes.
See here for this and other differences.