What should Nebula call you? This stays on your device and just makes everything feel a little more personal.
You can always change this later in Settings.
Welcome to Nebula AI
A premium AI assistant that runs on your own computer in Homework mode — your chats stay on your device. (Coder mode and first-time model downloads use the internet.)
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Works offline after first load
When you open Nebula from its launcher or a web link, the app, its AI libraries, and your downloaded model are cached, so it keeps working offline in that browser. (Opening the raw file by double-click cannot cache in the background.)
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Truly private
Conversations, files, and settings stay in your local Nebula folder.
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How local AI works
Nebula loads a language model directly into your browser runtime and runs inference on your own hardware using the fastest path available.
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GPU acceleration first
If a discrete GPU and WebGPU are available, Nebula uses them for maximum speed.
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Integrated graphics next
No dedicated GPU? Integrated graphics still accelerate generation.
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CPU fallback always
On any machine, Nebula falls back to optimized CPU inference so it just works.
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Privacy by design
Everything Nebula creates lives in a structured folder on your machine. You own your data completely.
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On-device storage
Models, uploads, conversations, cache, settings and logs are kept locally.
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No telemetry
Nebula never phones home and never uploads your prompts or files.
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Export anytime
Download any conversation as a portable file whenever you like.
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Homework: three model tiers
In Homework mode you pick the right on-device brain for the job — switch any time from the control panel next to the message bar. Coder mode uses one dedicated cloud model instead.
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Athena FAST · LIGHTWEIGHT
Snappy answers for quick questions, drafts, and everyday lookups.
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Atlas BALANCED · EVERYDAY
Great all-rounder for longer conversations and solid reasoning.
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Oracle MOST POWERFUL
Deep coding, analysis, and advanced multi-step reasoning.
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Tuned to your machine
Nebula scanned your hardware to recommend the best setup. You can change everything later in Settings.
Detecting CPU, memory, GPU and WebGPU support…
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Make it yours
Themes, accent colors, blur, particles, density, fonts and dozens more options.
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Bring your files
Drop in images, PDFs, code and docs for summaries, reviews and rewrites.
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How will you use Nebula?
Pick a workspace to start in. Each one keeps its own chats, engine and look, and you can switch any time from Settings.
New chat
Athena · ready
Nebula runs locally on your device. Press Enter to send, Shift+Enter for a new line, Esc to stop.
v26.1.6
You’re offline — cloud AI and first-time library/model downloads need a connection. Saved chats and already-cached models still work.