LLM Playground
LLM Playground · Other · Chatbot
LLM Playground is a free browser app for AI roleplay. Import SillyTavern cards, add lorebooks and personas, and chat with any model your own API key unlocks.
About LLM Playground
What Is LLM Playground
LLM Playground is a web chat client built around character roleplay. You bring the characters and you bring the model. Cards come in from SillyTavern or chub, or you write one from scratch with a personality, a scenario, alternate greetings, and example dialogue. The model comes from your own provider account.
The app costs nothing and asks for a username and password, not an email. Connect Airforce or any OpenAI-compatible endpoint, and every chat model that key can reach lands in a single picker. Switch models mid-conversation, or push one prompt through several of them and read the answers next to each other.
Two things decide whether it fits. You need a provider key before the first message, so anyone who wants to sign up and start typing hits a wall at step one. And the money question moves to that provider: the app charges nothing, while the models behind your key bill you at their own rates. Some providers run free tiers. Others bill from the first token.
Getting Started
- Sign up with a username and password. No email, no card, nothing to cancel.
- Connect a provider. Log in with Airforce or paste a key from any OpenAI-compatible endpoint, and the model list fills itself in.
- Pick a character. Browse cards the community published, run a character card import from SillyTavern or chub, or write your own personality, scenario, and alternate greetings.
- Add a lorebook and a persona if the story needs them. Lorebook entries wake up when their keywords come up, and the persona tells the character who you are.
- Chat, switch models when you want a second opinion, and pull a ZIP copy of everything when you want your data back.
Product Information
A quick look at LLM Playground's pricing, supported platforms, and performance.
Best for
The users, tasks, and scenarios where this tool fits best.
Users
- Roleplay and fan fiction writers
- People who already pay for a model provider
- Small friend groups
Tasks
- Moving an existing character library in
- Testing one scene across models
- Keeping a long story consistent
- Tracking what a story costs
Scenarios
- A weekend session with friends
- Auditioning models before you commit
- Leaving another roleplay app
Key features
Bring Your Own Provider
The app ships with no models of its own. You connect Airforce or any OpenAI-compatible endpoint, and the picker fills with everything that account can reach. That keeps the subscription count at zero and puts model choice in your hands. Setup still starts with a key rather than a signup form.
Character Card Import and Export
SillyTavern cards and chub cards go straight in, and characters come back out as standard cards other apps can read. Cards carry personality, scenario, alternate greetings, example dialogue, and a preferred model, so a character behaves the same way after a move. Nothing here locks a library to the platform.
Lorebooks and Personas
A lorebook holds world facts that stay dormant until their keywords appear, which keeps context small and the details steady. Personas do the other half of the job by telling the character who you are and how you speak. Scene faces shift with the mood of the conversation, so expressions follow the writing rather than sitting frozen.
Model Arena and Side by Side Answers
One prompt can go to several models at once, with answers laid out for comparison. Mid-conversation switching is a click, which matters when a cheap model handles banter and an expensive one handles the plot twist. An AI model arena for persona chat work is a practical way to find the model that holds a character best.
Group Roleplay Servers
Servers come with channels, and an AI character can sit in the room alongside the humans. A slash command summons it, running on your key or a member's. Themes can be set per server, so a horror channel doesn't have to look like the default light interface.
Usage Stats, Mind Maps and One Click Export
Spend tracking and mind maps turn a conversation history into something you can actually read. The export button packages chats, characters, prompts, memories, and settings into a ZIP in one click. Keys are encrypted at rest, and end-to-end encryption can be switched on so messages are stored with a key that never leaves the browser.
Pros and cons
Pros
- No subscription and no card. The client is free, and the only bill comes from whichever provider you connect.
- Model switching is instant and unlimited by the app, so you can compare a cheap model against an expensive one on the same scene.
- Character card import and export use open formats, which makes a library portable in both directions.
- Lorebook and persona tools go deeper than most chat front ends, where long stories usually mean stuffing context into a system prompt.
- Chats are private by default, keys are encrypted at rest, and end-to-end encryption is optional for people who want it.
Cons
- Nothing works without a provider key. If you want to register and start chatting in one step, this isn't that kind of app.
- Costs land on your provider account at provider prices, and the app can report spend but can't cap it. A long session on a premium model can cost more than a monthly subscription elsewhere.
- The interface is built for roleplay, so characters, lorebooks, and scenes sit in front of you even when you only want a plain chat window.
- Group servers depend on other people joining. A server you set up alone is just a channel with one AI character in it.
Frequently asked questions
Yes, and not as a trial. There's no subscription, no credit card, and nothing to cancel. The models run on your own provider account, and that provider bills you at its own prices, so check whether it has a free tier before you start a long session.
Related content
Explore related tools, skills, and articles for LLM Playground.
LLM Playground Alternatives
Odyssey 3
Odyssey · OtherOdyssey-3 is Odyssey's foundation world model. It simulates physics in real time, turns a prompt into an interactive environment, and adapts to robots, cars and games.
JarvisCore
Prescott Data · Coding · Productivity · OtherJarvisCore is an open source Python runtime where AI agents work as equal peers on an agent mesh, claim tasks from a shared ledger, and reach external services through a zero-trust broker.
Clef
Cloudflare · Business · OtherClef is Cloudflare's open-source decision model for Workers AI. It returns calibrated probabilities for typed questions, not generated text, so agents can classify, route, and act fast.