To see what features you'll have access to with Nebo free version on iOS follow this link: Nebo free version for iOS
For users of compatible Android or Windows devices you can also trial Nebo's Interactive Ink technology on your device via this link: webdemo. Here you can experience, not only the note-taking power of Nebo, but also its calculator and diagram making capabilities too. With Nebo Freemium you will have access to these tools and much more.
Don't forget to check the compatibility of your device before you purchase Nebo: Compatible devices.