About

Hey, Zetax-kun. Why are there ads on ZETA? About the AI Chat App "zeta" "zeta" is a chat-based AI service where users can enjoy conversations with AI characters and participate in AI-driven stories and roleplay. Unlike general question-and-answer AIs, it is specifically designed around the experience of "talking to a character" and "participating as the protagonist of a story." The official site hosts numerous AI characters and plots (stories), allowing users to choose their favorites and start chatting. (zeta) A major feature of zeta is its "Characters." Each character has a defined personality, speech style, backstory, and relationship with the user, and the AI responds according to these settings. This allows users to interact with characters in various roles—such as friends, rivals, or story figures—rather than just "asking questions" to a standard AI. Users can also create their own characters, defining original personalities and worldviews to share with others. (zeta) Furthermore, zeta allows for the creation of stories called "Plots." In a plot, you can set up characters, world-building, and specific narrative situations, and the AI will advance the conversation based on those settings. This means that instead of just watching a fixed story, users can enjoy an interactive novel-like experience where their inputs change the course of the tale. The character creation features have also seen significant updates. In 2025, an update allowed for up to 10 cover images per character, enabling more detailed visual representation of their world. In July 2026, the prompt limit for plots was expanded from 1,200 to 2,400 characters, and chat profile descriptions were increased from 500 to 1,000 characters. This allows for much deeper development of character personalities, settings, and story backgrounds than before. (zeta) There are also features to adjust AI responses during conversation. For example, the "Custom Correction" feature officially released in March 2026 allows users to give instructions like "make it longer," "speak more gently," or "use casual speech" for a specific response, tailoring it to their preference. The feature is unique because it allows users to specify exactly what and how they want to change, rather than just regenerating the response. (zeta) Additionally, the "Smart Reply" feature was added in 2025. This suggests potential follow-up sentences for the user during a conversation, which is helpful when one is unsure how to reply. (zeta) Internationalization progressed in 2026 as well. In August 2026, an initiative was announced to allow users worldwide to enjoy plots created in different languages, such as Korean and English, in addition to Japanese. This strengthened the system where Japanese users can enjoy stories by overseas creators in Japanese, and works by Japanese creators can reach users abroad. (zeta) In September 2026, a new feature called "zetagram" was introduced. This allows characters within stories to make social media-style posts, where users can see photos, text, and comments posted by them. It provides a sense that the characters are living their lives outside the main story. However, at present, there are conditions regarding compatible models and plots, and viewing posts consumes an in-game currency called "Pieces." (zeta) Regarding pricing, while basic chat functions are free, paid services like "zeta pass" and "zeta pro" also exist. In the past, certain features like background settings and private characters were moved to paid memberships. Since service content and pricing are subject to change via updates, users should check official announcements for current terms. (zeta) On the other hand, since zeta is a service utilizing generative AI, the AI does not always provide accurate responses. The official guidance notes that due to the nature of AI, unintended content may be generated. Furthermore, in March 2026, the management announced they were working on improvements based on user feedback regarding reply length, naturalness, and typos. (zeta) In summary, zeta is less of a "question-answering AI" and more of an AI chat and fiction platform specialized in moving a story forward while conversing with AI characters. Its great appeal lies in the combination of AI conversation, creation, and roleplay, where users can not only find characters to play with but also build their own characters and worlds. As of 2026, new features continue to be added, evolving the experience of talking to characters into something closer to a game or a living story.