Your AI assistant,
right in your browser
A private assistant that reads the page with you, and now can act on it too. Bring your own keys, pick any model, and keep everything local.
Spooky action at a distance: inside quantum entanglement
When two particles become entangled, measuring one instantly tells you about the other, no matter how far apart they are. Einstein hated the idea. Decades of experiments say he was wrong.
Ask anything about this page
Open anywhere
⇧⌘L on any page
Ask the page
It reads what you're reading
Float or dock
Window, sidebar or side panel
Any model
Switch mid-conversation
Slash commands
Quick actions with /
Works in the browsers you already use
Chrome
Safari
Arc
Firefox
Edge
DiaNew in 1.1 · Agent mode
Give it a task. Watch it work.
Turn on agent mode in the side panel and Asterysk clicks, types, scrolls and moves between tabs to get things done, right in your browser.
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Agent mode is on
You see every move
A glow marks the tab it's controlling, and its cursor glides to each click.
Hands back when it should
It pauses for logins, payment details and CAPTCHAs, then picks up where it left off.
Checks before it commits
It asks you first before buying anything or sending a message.
Works across tabs
Opens, switches between and closes tabs to compare and collect.
Saves what it finds
Exports results as CSV, JSON or Markdown, ready to download.
Try asking
Agent mode runs in the side panel on Chrome, Edge, Arc and Dia.
Private by design
No accounts, no servers, no tracking. Your keys and chats stay in your browser, and requests go straight to the provider you pick.
direct & encrypted
One shortcut away
Press ⇧⌘L on any page to open or close Asterysk instantly.
Float, dock or side panel
A draggable window, a resizable sidebar, or a side panel that stays with you across tabs.
Bring your own key
Plug in keys from the providers you already use. You pay them directly.
History, by domain
Every chat is filed under the site it happened on. Pick up where you left off.
Select. Right-click. Ask.
Highlight any text and choose Send to Asterysk. It lands in the chat as a quote, ready for a question or a slash command like /translate, /explain or /factcheck.
The museum will stay open until midnight every Friday through the end of the year.
美術館は年末まで、毎週金曜日は深夜0時まで開館します。
The museum will stay open until midnight every Friday through the end of the year.
Slash commands
/tldr, /explain, /translate, /rewrite, /reply, /factcheck, /export and more. Add your own in settings.
Tools built in
Web search, screenshots, image uploads and the page you're on, all built in. Turn on agent mode and it can control the browser and save what it finds as files.
Searching the web…
Multi-model
Every frontier model.
Your keys.
Switch providers and models on the fly, even mid-conversation. Use the best model for each task, or run Apple's on-device model in Safari with no key at all.
Safari · iPhone · iPad · Mac
Take it with you.
The same assistant, right inside Safari on your phone. Your settings sync between the app and the extension, and Apple's on-device model works without any API key.
Scan to install
or open the App StoreSpooky action at a distance
Entangled particles stay linked across any distance. Measure one and you instantly know the other.
Ask anything
Frequently asked questions
It lives on the page you're already reading. Asterysk sees the page as context, so you can ask about an article, a doc or a pull request without copying and pasting anything.
Give it a task in the side panel and it works in your current tab: clicking, typing, choosing options, scrolling, navigating and moving between tabs. It can take screenshots to understand a page and save what it finds as a CSV, JSON or Markdown file. Agent mode is available on Chrome, Edge, Arc and Dia.
You stay in charge. A glow marks the tab it's working in and you can watch every step. It stops and hands control back for logins, payment details and CAPTCHAs, asks before buying anything or sending a message, and treats text on web pages as information, not instructions.
Nowhere but the provider you choose. There are no Asterysk servers and no tracking. API keys, settings and chat history are stored locally in your browser.
Anthropic, OpenAI and Google Gemini directly, plus anything available through OpenRouter or Vercel AI Gateway. On Apple devices you can also use Apple's on-device Foundation Models in Safari.
Chrome, Edge, Arc, Dia and other Chromium browsers, Firefox, and Safari on Mac, iPhone and iPad.
For cloud models, yes. You bring your own key and pay the provider directly for what you use. Apple's on-device model needs no key.
Click the Asterysk icon in your toolbar or press ⇧⌘L on any page. You can also highlight text, right-click and choose Send to Asterysk. Pin the extension so it's always one click away.