Oniichan.app
Oniichan.app is an AI-powered creation service for manga, comics, anime-style artwork, and original characters. Its documented workflow combines text-based generation with structured editing, allowing creators to develop stories, character designs, pages, and panels in one workspace.
What it does
Oniichan.app can turn a story or character description into illustrated manga pages, character designs, and panel layouts. The associated product documentation describes support for manga, manhwa, webtoon, comic, and anime-oriented styles, along with structured story outlines and dialogue generation in more than 20 languages.
The service is intended for iterative creation rather than one-step image generation. Users can refine complete pages, individual panels, or selected regions, and can maintain reusable character references through character sheets and libraries. Documented tools include AI inpainting, line-art colorization, image upscaling, video-to-anime conversion, and animation of still illustrations.
Notable capabilities
- Text-to-manga generation with illustrated pages, panel layouts, and story outlines.
- Character reference sheets and reusable character libraries for recurring designs.
- Page-, panel-, and region-level editing, including AI inpainting and line-art colorization.
- Image upscaling, video-to-anime conversion, and animation for still illustrations.
- Public sharing and presentation mode, with dialogue generation in more than 20 languages.
Who it helps
The tool is suited to manga and comic creators, webtoon and manhwa authors, character designers, and artists developing anime-oriented original characters. It may also help users who want to prototype a visual story from written ideas before refining page composition and character consistency.
How it fits a workflow
A typical workflow begins with a story or character description. Oniichan.app can then produce an outline, character references, and page or panel concepts. The creator can reuse those character references, adjust individual regions or panels, add dialogue, and prepare pages for sharing or presentation. This makes the service relevant to projects that need repeated visual development rather than isolated illustrations.
The service is a third-party application and uses external AI providers for content-generation features; its third-party terms specifically identify OpenAI and state that prompts and contextual content may be sent to those providers for processing. The same documentation identifies Google OAuth, Stripe, Unsplash, and Highcharts among associated services.
Strengths and limits
The documented feature set covers multiple stages of comic production, from outlining and character development through page editing and presentation. However, usage is subject to restrictions on unlawful or harmful content, unauthorized access, scraping beyond normal use, spam, credit-system circumvention, and attempts to extract or reverse-engineer underlying models. The acceptable-use policy also says that excessive use of AI credits, storage, or bandwidth may lead to throttling or account review.
Vendor-associated documentation lists a free tier with basic tools and limited manga-page generation, plus a Pro plan priced at $9.99 per month with unlimited manga generation, full-resolution exports, priority queueing, and advanced editing tools. These plan details should be verified at checkout because the primary homepage was unavailable during retrieval.