O₂ Engine is HTML5-based visual novel engine.
It works on Windows, Mac, iPhone, iPad and Android.
O₂ Engine interprets KAG script. It is compatible with Kirikiri, one of the most popular engine to develop visual novels.
Fully written in HTML5, therefore runs on modern browsers, including mobile. No Flash, no applet.
Developing novels with O₂ Engine, you can distribute them not only as web apps, but also as apps for iOS, Android, Windows & Mac.
Sample novel developed with O₂ Engine.
It is embedded in iframe,
and you can put it on your page as well!
Currently O₂ Engine is specially licensed for novelsphere.jp , where you're able to get the SDK and distribute/sell your works for free!
If you want to use O₂ Engine on your own platform, or to package your novel as an app, you can buy the business license.
|Feature||Free Plan||Business Plan|
|Get SDK and Document|
|Publish to ...||NovelSphere only||Other platforms or websites|
|Incorporate O₂ Engine into Your Program|
|Package Novel as Windows/Mac Application|
|Package Novel as iOS/Android Application|
|Receive Technical Support|
* NovelSphere allows you to package your novel as Windows/Mac/iOS/Android application if the novel is submitted to NovelSphere. You need to buy business license only when you want to package your novels not related to NovelSphere.
These platforms and works use O₂ Engine to distribute their visual novels.