GitHub
Open source · Private · No subscription

Your local AI agent.
Entirely on your Mac.

Sumika helps you research, understand files, run approved commands, and build things, all on your device. No cloud, no account, no subscription. Your work stays on your Mac.

View on GitHub See what it can do

Free & open source · Runs on Apple Silicon · Your data stays on your Mac

Sumika running an agent task on a Mac, with each step reviewed and executed on-device.
Why Sumika

A real local agent that stays on your machine

Research, files, commands, browser tools, and coding help, without sending your work to the cloud.

100% on your Mac

The AI runs on your device. Your files, prompts, and conversations are never uploaded to anyone’s cloud. No account to create, nothing to sign in to.

More than chat

Sumika can read local files, search the web, summarize context, run approved commands, and chain tools together to finish real work.

Local workspace

Ask questions about a folder, compare files, inspect diagnostics, or review changes without handing broad access to a cloud service.

Web access you approve

Need docs, examples, or source material? Sumika can search and fetch the web with explicit permission, then bring the results back into the task.

Always asks first

Before it changes a file or runs a command, Sumika asks for your OK. Nothing ever happens behind your back.

Nothing to configure

No API keys, no monthly bill, no remote account. Sumika downloads what it needs for local AI. Free and open source.

How it works

From idea to done, without the cloud

Sumika works like a teammate who happens to live on your Mac.

  1. 01

    Ask in plain words

    Tell Sumika what you want: research a topic, summarize a folder, inspect a file, build a prototype, or explain what changed.

  2. 02

    It makes a plan

    Sumika works out the steps and which tools it needs, such as reading files, checking the web, opening a preview, or running a command.

  3. 03

    You stay in control

    It asks before it touches anything. Approve each step as it goes, or let trusted work continue. Your call.

  4. 04

    It gets it done

    Sumika runs the approved steps, checks the results, and leaves a trace you can inspect when you want to understand what happened.

Get started

Open source, and just getting started

Sumika is free and in early development. The app is already useful for local agent experiments, and a one-click Mac download is on the way.

View on GitHub ★ Star to follow along

Requires a Mac with Apple Silicon · macOS 15 or later · Free, Apache-2.0

Build it yourself (for developers)
zsh — sumika 
# install the toolchain
brew install just swiftlint swift-format

# clone & build
git clone https://github.com/ngutech21/sumika-chat
cd sumika-chat
just build