KOI is described as '(Kommunikation, Organisation, Information) is a cloud based task, document and process management software. KOI stores all your ideas, projects, tasks and documents in the cloud' and is an app in the Office & Productivity category. There are more than 100 alternatives to KOI for a variety of platforms, including iPhone, Windows, Online / Web-based, Android and Mac. The best alternative is Joplin, which is both free and Open Source. Other great apps like KOI are Standard Notes (Freemium, Open Source), Microsoft OneNote (Freemium), Evernote (Freemium) and Simplenote (Free, Open Source).
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.
Take your tasks anywhere with this feature-packed application. See tasks located nearby, add and complete tasks on the go, organize upcoming tasks, and sync it all seamlessly with Remember The Milk. Desktop app available for Pro users. Very good integration in GMail!
Get more done with the Google Tasks mobile app. Manage, capture, and edit your tasks from anywhere, at anytime, with to-dos that sync across all your devices. Integrations with Gmail and Google Calendar help you get tasks done—faster.