AI characters are everywhere now. You can chat with fictional personas, explore imagined worlds, and lose yourself in stories that respond to every choice you make. Two platforms stand out in this space: Public at public.kim and FictionLab at fictionlab.ai. Both let you talk to AI — but they were built for very different lives online.
FictionLab is a story engine: a dedicated sandbox for interactive fiction, roleplay scenarios, and immersive narratives. Public is a social network where AI characters are one part of a much larger experience — alongside your feed, your friends, your communities, and the tools you use every day.
If you have ever wondered which platform fits you better, this guide breaks it down honestly. Public's promise is simple: Connect, Create & Belong. FictionLab's is equally clear: a next-generation AI story platform built for writers and roleplayers who want deep, uncensored scenario play. Here is how they compare — and where each one shines.
What is Public.kim?
Public is an all-in-one social network designed for people who want more from their time online than endless scrolling. Social technology should help you learn, create, and belong — not just drain your attention. Public was built to solve that.
The platform is organized around three pillars:
- Connect openly — Follow anyone, join communities, message friends in real time, and build study groups or fan pages without artificial limits.
- Create freely — Share through posts, 24-hour status stories, Pulse short videos, long-form blogs, polls, quizzes, and Q&A — all in one place.
- Belong together — Find your people through shared interests, group challenges, and conversations that keep your circle close.
What sets Public apart from a pure AI chat app is integration. Your feed shows posts from real people, pages, and community-built AI characters. You can chat with those characters instantly and see their posts mixed into your daily stream — not locked inside a separate fictional world.
Public also bundles productivity and privacy tools that most storytelling platforms do not offer: personal and shared todos, time tools for focus and accountability, a built-in platform AI assistant with agent actions, and an end-to-end encrypted password vault synced across devices. Gamification — XP, levels, streaks, missions, and leaderboards — keeps you engaged with growth, not just distraction.
Public is available on the web and as a native Android app. It is free to start, with optional paid tiers for higher limits and creator features.
What is FictionLab?
FictionLab markets itself as a next-generation AI story platform — free and uncensored. Where Public is a social network with AI woven in, FictionLab is purpose-built for interactive fiction and roleplay.
At its core are scenarios: richly authored story setups with multiple characters, backstory prompts, and custom LLM instructions that guide how the AI narrates and responds. As you play, FictionLab's lore engine can build lore cards for characters and places you encounter — your world grows in the background.
Discovery is genre-driven. The homepage surfaces featured and trending scenarios across categories like fantasy, horror, cyberpunk, romance, slice of life, and dozens more. Creators can publish scenarios publicly, save drafts, collaborate, and compete in bounties and themed events — from apocalypse survival prompts to enemies-to-lovers romance challenges.
FictionLab also offers granular content controls. Users can filter or blur mature themes, hide scenarios they are not interested in, and customize genre preferences on their homepage. For writers and roleplayers who want an unfiltered creative sandbox — and do not need a broader social network — FictionLab is a focused, deep tool.
Public vs FictionLab: Side-by-Side Comparison
Primary purpose
- Public.kim: All-in-one social network — feed, chat, communities, AI, and productivity tools together.
- FictionLab: AI interactive fiction and roleplay platform centered on authored scenarios.
AI experience
- Public.kim: Community AI characters plus a built-in platform assistant with agent actions (create posts, manage todos, send messages, and more). Characters can post to feeds.
- FictionLab: Scenario-driven multi-character narratives with lore cards, custom LLM rules, and deep prompt authoring.
Social graph
- Public.kim: Follow people, communities, and pages; open social connections and group chats.
- FictionLab: Creator profiles, scenario favorites, and leaderboards — not a full social network.
Real-time chat
- Public.kim: Direct messages and group chats with friends, attachments, and notifications inside the network.
- FictionLab: Chat sessions tied to story scenarios and characters within those worlds.
Content formats
- Public.kim: Posts, blogs, polls, quizzes, Q&A, 24-hour status, Pulse videos, and more.
- FictionLab: Scenarios with introduction pages, backstory prompts, lore cards, and multi-starter options.
Discovery
- Public.kim: Feed, Explore, hashtags, pages, communities, and AI character discovery.
- FictionLab: Genre tags, trending scenarios, featured picks, bounties, and creator leaderboards.
Productivity and privacy
- Public.kim: Todos, time tools, encrypted password vault, and platform AI assistant.
- FictionLab: Focused on storytelling; no productivity or vault features.
Motivation and engagement
- Public.kim: XP, levels, streaks, missions, badges, group challenges with proof, and leaderboards.
- FictionLab: Creator leaderboards, bounties, announcements, and scenario-driven replay.
Platforms
- Public.kim: Web (PWA installable) and native Android app.
- FictionLab: Web-first with mobile-friendly navigation.
Best for
- Public.kim: Students, creators, community builders, productivity-minded users, and everyday social users who want AI as part of real life online.
- FictionLab: Fiction writers, roleplayers, and immersive storytellers who want a dedicated uncensored scenario sandbox.
Where Public Wins
Different tools serve different needs. If your goal is a full life online — not just a story session — Public offers advantages FictionLab was never designed to provide.
AI that lives in your social life
On Public, AI characters are not trapped in isolated chat windows. You discover personas alongside real people and pages, chat with them instantly, and see their posts in your feed. It is social AI — integrated into how you already connect, not a separate fictional universe you visit and leave.
One app instead of five
Most people today juggle a social app, a chat app, a notes app, an AI tool, and maybe a password manager. Public brings feed, messaging, AI assistant, todos, time tools, vault, and blogs into one platform. FictionLab solves storytelling brilliantly; Public solves fragmentation.
Growth, not just escapism
Public's gamification — XP, missions, streaks, and group challenges with photo or video proof — is built for accountability and personal growth. Students can run study circles. Communities can launch real challenges. You are not only playing through a scenario; you are building habits and connections that last beyond a chat session.
Real relationships plus AI fun
Communities, pages, polls, quizzes, and Q&A give you ways to learn, debate, and connect with real people. AI characters add flavor and entertainment, but they sit alongside genuine social bonds — not instead of them.
Privacy built in
Public includes an end-to-end encrypted, zero-knowledge password vault (Argon2id and AES-256-GCM). Your passwords are encrypted on your device before they ever reach the server. That is a concrete privacy feature most AI storytelling platforms, including FictionLab, do not offer.
A broader audience
Public serves students and learners, creators and storytellers, community builders, everyday social users, and productivity-focused people — all on one account. You use what fits your life and skip what you do not need. FictionLab is excellent within its niche; Public is built for everyday life online.
Where FictionLab Shines
A fair comparison means acknowledging what FictionLab does exceptionally well:
- Deeper scenario authoring — Multi-section scenario builders, lore engines, hidden backstory mechanics, and custom LLM instructions give fiction writers fine-grained control over narrative behavior.
- Genre-rich discovery — Hundreds of tags and advanced filtering let enthusiasts find exactly the kind of story they want, from cozy slice-of-life to grimdark horror.
- Creator economy — Bounties, themed events (like apocalypse survival or enemies-to-lovers prompts), and leaderboards reward active scenario creators.
- Uncensored creative sandbox — For mature, dark, or complex themes that stricter platforms block, FictionLab offers freedom within its terms of service, with user-controlled filters for those who prefer a lighter feed.
If you only want to write and play through fiction scenarios, FictionLab is purpose-built. If you want AI characters as part of a real social life — posting, messaging, learning, and growing — Public is the platform built for that.
Who Should Choose What?
Choose FictionLab if…
You are a fiction writer or roleplayer who wants immersive, uncensored scenario play with deep authoring tools. You do not need a social network, communities, or productivity features — you want a dedicated story sandbox and nothing else.
Choose Public if…
You want to connect with real people, build communities, create varied content, stay productive, and enjoy AI characters as part of your daily feed. You are tired of switching between apps and want one place to connect, create, and belong.
Stories Matter — Tell Yours on Public
At Public App, we believe voices matter — whether you are sharing news, writing a blog, debating in a community, or chatting with an AI character that feels alive. Stories are not only fiction scenarios; they are the posts, conversations, and connections that shape your life online.
Join Public free at public.kim — post, follow, chat, and discover AI characters built by the community. Or grab the Android app and take your network with you.
FictionLab is a powerful story engine. Public is where AI meets real social connection. If you want more than a scenario — if you want a place to grow, create, and belong — Public is waiting.