Latest project update Developer preview

Give it a task.
Watch it get done.

Tell Nabsun what you want done. It can navigate websites, click controls, fill forms, and work across tabs. Review requested actions and approve when you are ready.

View available downloads Watch the demo

Windows x64 and Apple-silicon Mac · About 1.4 GB, including the model

All downloads and installation details

Free and open source. Start with the included local assistant, or connect a more capable assistant for demanding tasks.

nabsun Illustration

example.com / service-requestAsk about page

A PAGE YOU OPENED

Your request, prepared.

Nabsun selects the category and fills the details. You review before approving submission.

Saturday 12:00

Assistant

Page: Service request

Create a service request using these details. Let me review it before submitting.

ILLUSTRATED FORM PREPARATION

I opened the request form, selected the category, and entered your details. The form is ready for your review; it has not been submitted.

Open form → fill fields → review → approve submission

You stay in control

Explore an example. This illustration does not run an AI task.

Windows and Apple-silicon MacsBookmarks and saved passwordsTabs, downloads, and session restore

MAKE YOURSELF AT HOME

From a request
to a completed task.

Open a website, describe the result you want, and let Nabsun work through the steps.

01
Open a page
Install Nabsun, then browse as usual.
02
Describe the task
Try: “Fill this form with these details. Let me review before submitting.” Press Send to start.
03
Review and decide
Follow its progress as it navigates, clicks, and types. Review the result, approve requested actions, or use Stop to cancel.

YOUR ASSISTANT

Choose the help your task needs

The included local assistant needs no account and can handle simple questions and basic browser tasks. For longer tasks with several steps, connect a more capable assistant such as Codex or Claude. Results depend on the assistant and website.

Optional: other assistants and advanced choices

Codex and Claude use an existing eligible account. Online services receive your questions and any page text you include, and their charges and account limits apply. In 0.1.13, choose an assistant in Settings → Assistant choice; older versions call this section Model.

Option	What you need	Where it runs	Useful for
Built-in Qwen3 1.7B Included	No account or API key	On your CPU	Simple questions and basic browser tasks
Codex / Claude Code	Connect in the app and sign in to an eligible provider account	Through the provider’s CLI and service	Tasks that benefit from a more capable model
OpenAI / Anthropic API	Your API key; provider usage charges apply	At the selected cloud provider	Choosing models through your own API account
Ollama / custom local model	Your Ollama server, or a compatible local GGUF model and engine	On the configured machine or server	Using a local model you already run

Answers from the built-in assistant can work offline. Loading websites and using online assistants still require internet access.

PRODUCT DEMO

See Nabsun take action

Recorded on an earlier release. Version 0.1.13 simplifies the header and first-run guide; the recording shows the older interface.

Watch demo

The YouTube player loads when you click. Open on YouTube ↗

LATEST RELEASE

A more comfortable start in 0.1.13

Nabsun 0.1.13 is available. Start with a simpler welcome guide, a calmer assistant header, example questions, and a shutdown stability fix. Choose your platform below to install it.

An easier hello

One recommended starting point. Example questions wait for you to press Send.

A calmer assistant

A compact header, with the other controls in one tidy options menu.

Room to make it yours

Full-page Settings, clear categories, and advanced controls when you need them.

A smoother goodbye

A fix for delayed window updates that could cause an error after closing.

Attached or detached assistant layouts, saved 75–200% text zoom, queued follow-ups, and Stop remain available. App updates require downloading and installing the new version. Latest published release notes

DOWNLOAD AND INSTALL

Nabsun 0.1.13

Download only from the official GitHub release. Files include the local model and are about 1.4 GB. Download buttons use the latest public release, not draft builds.

Unsigned preview: your computer may show a warning

Nabsun is a developer preview. Windows builds are unsigned. Mac builds are ad-hoc signed, but have no Apple Developer ID signature or notarization. Your computer may warn you or block the app because it cannot verify the publisher. A warning is not proof that a download is safe: check the source and checksum before deciding to open it.

WINDOWS · X64

Install on Windows

Get the Windows installer

Show Windows installation steps

Click the button above. If the release page opens, choose the file ending in -x64-setup.exe under Assets.
Open your Downloads folder and double-click the installer.
If Windows shows Windows protected your PC, choose More info. Check that it is the Nabsun file you downloaded. If you trust this download and want to continue, choose Run anyway.
Follow the installer, then open Nabsun from the Start menu. If Windows asks permission to make changes, continue only if you intended to run this installer.

Prefer no installation? Choose the portable .exe, then open it directly. It can show the same warning.

No Run anyway button?

Smart App Control or a work/school security policy may block unsigned apps without offering an exception. Ask your administrator or wait for a signed release. Keep your protection enabled.

Microsoft explains SmartScreen warnings

MAC · APPLE SILICON

Install on a Mac

Get the Mac download

Show Mac installation steps

Choose Apple menu → About This Mac. You need an Apple M-series chip. This download is not for Intel Macs.
Download the file ending in -arm64.zip from the release Assets. Double-click the ZIP, then drag Nabsun.app into your Applications folder. If a release offers a DMG instead, open it and drag the app to Applications.
Open Applications and double-click Nabsun once. If macOS says the developer cannot be verified or Apple cannot check it, dismiss that message.
If you trust the download, open System Settings → Privacy & Security. Scroll to Security, find the Nabsun message, and click Open Anyway. Confirm with Open and authenticate if asked.
Next time, open Nabsun normally from Applications.

Still blocked, or the app is reported as damaged?

If Open Anyway is unavailable, your Mac may be managed by an administrator. Ask them for help. If macOS reports damage or malware, stop and check the release source and checksum; do not treat that as an ordinary publisher warning. Report the exact message in a GitHub issue.

Apple explains opening an unverified app

Optional: check that your download matches the release

Open SHA256SUMS.txt from the same release as your file. Find its filename and compare the full checksum with the output below. Replace the example filename with your actual download.

Windows: PowerShell

Get-FileHash "$HOME\Downloads\Nabsun-VERSION-x64-setup.exe" -Algorithm SHA256

Mac: Terminal

shasum -a 256 "$HOME/Downloads/Nabsun-VERSION-arm64.zip"

A matching checksum confirms that the file matches that release; it does not establish publisher identity or guarantee safety. If it does not match, do not run the file.

No Intel Mac or Linux installers are currently offered. All published release assets

BEFORE YOU USE IT

Controls and current limits

Nabsun is a developer preview. Review the assistant’s output and actions, especially before submitting forms or changing account data.

You approve browser actions

Reading pages is automatic. Clicking, typing, navigation, and page code require approval by default. You can allow individual tools or enable Autopilot for write actions. Autopilot stays enabled until you turn it off; page code has its own permission.

Read the security notes ↗

What to expect

The small local model can struggle with long or complex tasks.
Some websites, sign-in flows, and Cloudflare checks may not work.
No private windows, profile sync, tab groups, or split view.
Chrome extensions load from folders; there is no Web Store installation flow and API support is partial.
Update notifications link to downloads; they do not install updates.

MORE DETAILS

Common questions

Can I use Nabsun from Codex or Claude in my editor?

Yes. Nabsun exposes browser tools through MCP, a protocol that lets AI tools connect to other applications. Copy the connection configuration from Settings → Integrations → Connect an external agent. Calls use the same approval settings as the assistant sidebar.

What data stays on my machine?

The bundled model runs locally, so its inference does not send your prompts to a cloud model provider. Normal browsing still contacts websites, and update checks contact GitHub. If you choose a cloud assistant, it receives the context sent to it. CLI credentials remain in the provider CLI’s store.

Can I give the assistant personal context?

You can edit soul.md with preferences such as your time zone or how you like answers. By default this file is shared only with local models. Settings shows its location and whether it is shared with the selected provider.

How do I report an issue?

Open a GitHub issue with your Nabsun version, operating system, and steps to reproduce the problem. Remove passwords, API keys, and other private information from screenshots or logs.

For developers: build from source

Requires Node.js and npm. These commands install dependencies and fetch the local engine and model. Packaged downloads above do not require these steps.

From source

git clone https://github.com/naveenalavilli/nabsun.git
cd nabsun
npm ci
npm run fetch:model
npm start

If Electron did not download, run npm run setup. Linux requires manual engine setup. See the development instructions.

PRACTICAL GUIDES

Put your browser to work

Start with the included assistant, or connect an external agent to carry out tasks in your open tabs.

Try your first page summary

Start with the included assistant, ask a short question, and check the answer. No account needed.

For developers: connect an external agent with MCP

Use Nabsun as a browser MCP server for your editor or external agent, working in existing tabs with shared approval controls.

Give it a task.Watch it get done.