About Koimo
Koimo is an independent AI character chat and roleplay project made by Ninja. It offers adult fictional conversations and a free tool for converting supported character and chat backups.
Characters and stories you can take with you
Ninja makes Koimo as an independent project. The app combines authored character premises, private character creation and supported imports. The public character pages explain each opening before you decide to chat. Fan adaptations identify their source and unofficial status; they are not official conversations with the creators or rights holders.
Koimo is for adults 18+. Romance and dramatic themes are allowed within the content policy; explicit scenes fade to black. The characters are AI, and replies can be mistaken or inconsistent. The app includes tools for keeping continuity, but does not promise perfect memory.
Where chat messages go
Live chat sends the context needed for a reply to a configured model provider. The standard provider is DeepSeek in China. The protected-region route for the EU/EEA, UK and Switzerland uses DeepInfra in the United States. Regional availability is controlled separately; this description is not a promise that every region is open.
Messages and account content saved to a library are handled by the hosted service. This is different from local file conversion. Read the privacy notice for the current processing and deletion details, and the terms before using chat. Do not treat a fictional character as a confidential human adviser.
Conversion stays on your device
The free import tool reads supported files in a browser worker and creates downloadable backups. It needs no account for local conversion. Saving supported content to a private library is a separate choice. The tool does not sign in to another service or retrieve hidden definitions.
Start with the backup walkthrough, inspect a character card, or read the export guide. Keep untouched originals so choosing another app later does not depend on keeping one account.