Theory.io has released NoteSuite, a new integrated productivity app. It's the sequel to Projectbook, Theory's best-selling app from 2012. But NoteSuite takes the core idea of Projectbook and extends it much further - plus it adds support for OS X, so you can organize yourself from whatever machine you're working.

NoteSuite helps you take notes, manage to-dos, clip web pages, annotate content, read and search PDFs and MS Office files and web clips together. What's more, it syncs and backs up the data, and unlike some other products in this category like Evernote, it doesn't require a subscription fee.

That alone would make NoteSuite a worthy addition to the pantheon of iOS productivity apps, but NoteSuite takes it a step further by offering a Mac client, as well. The Mac version automatically syncs with NoteSuite for iPad.

With NoteSuite you can type and make lists, take photos, record audio and capture to-dos within note pages. PDF files can be marked up, highlighted, annotated, signed, and PDF forms can be filled out. You can also draw and handwrite on note pages in the iPad version.

NoteSuite lets you clip web pages for later consumption (including offline), and it incorporates to-do management functions like date tracking, reminders, and the ability to match to-dos with projects and relevant notes.

MS Office and Apple iWork files can be converted to PDF for further markup and annotation, and search will work with files that aren't organized too.

And if you're already a ProjectBook user, you're entitled to a free upgrade.

The Mac version has been similarly discounted.