Idea Notebook is described as 'Never forget another brilliant idea. Log, organize and track your ideas and more with the Idea Notebook. 1. LOG your ideas with a quick note in the Idea Notebook anytime, anywhere' and is an app in the Office & Productivity category. There are more than 100 alternatives to Idea Notebook for a variety of platforms, including Windows, Mac, Online / Web-based, Android and iPhone. The best alternative is Joplin, which is both free and Open Source. Other great apps like Idea Notebook are Standard Notes (Freemium, Open Source), Google Keep (Free), Microsoft OneNote (Freemium) and Evernote (Freemium).
Joplin is a free, open source note taking and to-do application, which can handle a large number of notes organised into notebooks. The notes are searchable, can be copied, tagged and modified either from the applications directly or from your own text editor.