Murmur Sphere
Download for Windows

Your private character-chat space

Create a character. Start a conversation. See where the story goes.

Murmur Sphere is a free Windows app for private AI conversations. It uses AI models that run on your computer, so your chats stay there.

Download for WindowsSee how it works

Free alphaWindows 10/11No account

Desktop appSynthetic capture
Murmur Sphere conversation workspace using a synthetic documentation character.
A synthetic documentation profile in Murmur Sphere 0.4.2-alpha.1.

Why Murmur Sphere

Your characters. Your stories. Your computer.

01

Bring characters to life

Create or import characters, choose who you want to be, and let conversations grow into stories.

02

A little world that lives on your PC

Use Ollama and a compatible local AI model. Murmur Sphere never silently switches to an online AI.

03

Your stories stay yours

Your conversations, characters, and Personas stay on your computer.

Getting started

Four steps to your first conversation

  1. 1

    Download and install

    Download Murmur Sphere from this site and open the installer. Windows may show an unsigned-app warning for this early release.

  2. 2

    Open Ollama

    Ollama is the separate program that runs your AI model.

  3. 3

    Choose a model

    Pick a compatible model and wait until the model status at the top says Ready.

  4. 4

    Meet a character

    Create or import a character, then start chatting.

Before you install

Want the practical Windows setup?

See which parts you need, what stays local, and what still uses the internet.

Read the private character chat guide

Inside the desktop app

Focused on conversation, clear about readiness.

Characters, Personas, model readiness, and recovery stay visible without turning the workspace into a developer console.

CharactersSynthetic capture
Synthetic Characters screen with create and import choices.
Create or import a supported character card.
PersonaSynthetic capture
Empty Persona editor in a synthetic profile.
Persona context is optional and stays local.
ModelsSynthetic capture
Synthetic Model Library with explicit installed and download choices.
Installed and public-download choices remain distinct.

Private by design

Your stories stay yours

Murmur Sphere keeps the private parts of the experience on your computer. Going online is limited to clear actions such as visiting this website, downloading the app or a model, checking for updates, sending email, or choosing creator support.

How privacy works

Three simple promises

  • Your conversations stay on your computer.
  • No account or message credits.
  • No ads or cross-site tracking.

Independent by design

Support the person building Murmur Sphere.

Financial support is completely optional. Murmur Sphere remains free, and support does not unlock credits, features, priority, influence, or private access.

Support the creator