Getodo is described as 'colorful lightweight multi-level to-do list on Android, iOS, web' and is an app in the Office & Productivity category. There are more than 100 alternatives to Getodo for a variety of platforms, including Online / Web-based, Windows, Mac, iPhone and Android. The best alternative is Joplin, which is both free and Open Source. Other great apps like Getodo are Standard Notes (Freemium, Open Source), Google Keep (Free), Microsoft OneNote (Freemium) and Trello (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.