Local character chat choices
Murmur Sphere is a free, private character-chat app built to make local AI easier to use. Create a character with your local model, load an LLM in the app, and even train a LoRA when you are ready. Bring in supported character card files, or selected PolyBuzz chats for training.
See the feature comparisonCompared using the current public Murmur Sphere alpha and SillyTavern’s official documentation, reviewed October 2026.
At a glance
Both cover the basics. Murmur Sphere also puts local character generation, model loading, and LoRA training into the app itself.
| What matters | Murmur Sphere Current Windows alpha | SillyTavern Documented default setup |
|---|---|---|
| Free local character chat | Yes: No account; chat with a model on your PC | Yes: Free; connect a local model backend |
| Create characters and personas | Yes: Create a character; add optional Persona context | Yes: Character editor and user personas |
| Import character card files | Yes: Supported PNG and JSON cards, including cards made elsewhere | Yes: Import supported character cards from files |
| Built-in local AI character generation | Yes: Generate from an idea, refine fields, and review before saving | No: Built-in editor is manual; third-party tools can help |
| Integrated local LLM loader | Yes: Find, prepare, load, and check readiness in the app | No: Default setup loads models in a separate backend |
| Built-in LoRA trainer | Yes: Guided local QLoRA training with compatible base and hardware | No: No text-model LoRA trainer in the documented default setup |
| PolyBuzz chats for training | Yes: Import selected conversations into the local training review | No: No built-in PolyBuzz chat import for LoRA training |
The first three rows are shared features. An X means the workflow is not built into SillyTavern's documented default setup; extensions or separate tools may offer it. PolyBuzz import here means selected chats for training, not PolyBuzz characters or an entire account. Both apps need a model. Murmur Sphere also needs Ollama installed separately; local LoRA training requires a compatible original model and suitable hardware.
Getting started
Local chat still needs an AI model running on your computer.
Murmur Sphere
Install Murmur Sphere and Ollama separately, then get a compatible model. The app helps you choose and load it and shows Ready when you can chat. Pick an included character, import a supported card file, or generate one with your local model. Later, you can train a LoRA using reviewed source chats, including selected PolyBuzz conversations.
SillyTavern
Install and run SillyTavern, set up a local model backend, and connect to it in the app. The backend manages the model. You can create characters or import cards.
Privacy depends on the setup
Character prompts and replies go to the model running through Ollama on your computer. The app does not silently switch to a hosted AI. Current saved profiles are local plaintext with integrity checks, not encrypted at rest. Downloads, a small startup release check, optional public images, and other actions you choose can use the internet. Read the full privacy boundary.
You choose the backend. If you connect a local model, generation can happen on your machine. If you connect a hosted AI provider, the prompt goes to that provider. Extensions and other configured services can add their own connections, so check the setup you use.
The choice
Murmur Sphere keeps the normal path short: choose a compatible model, Load, choose or make a character, and chat. Its Model Library handles preparation and shows when the model is ready. If you want to go further, the app has a guided LoRA training workflow. It is free, needs no account, and keeps your character chats on your computer.
Ollama and the model are separate installs. Training also requires a compatible original model and suitable hardware. Murmur Sphere is independent of SillyTavern; its settings and chat history do not transfer directly.
Before you install
The Windows app is free and needs no account. Ollama and a compatible model are separate. The current installer is not code-signed, so Windows may show an “Unknown publisher” warning. Its source is private. Check the Download page for the current Windows requirement and official file details.
Murmur Sphere details reflect the current public release, its release highlights, and this site’s setup and privacy guides. SillyTavern details were checked against its official introduction, character management, extensions, local-model, and API Connections documentation at docs.sillytavern.app in October 2026. Features and installation instructions can change, so check each project’s current documentation before making a move.
