Athanor by arbastro
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How to open Athanor

Athanor runs in your browser at athanor.arbastro.com/app and as a Windows desktop app. Both are the same app, and you do not need an account to draw, convert or export.

Steps

  1. Go to athanor.arbastro.com/app in Chrome, Edge, Firefox or Safari. Home opens, with the ways to start a document across the top.

    Athanor Home with its six start cards, from Blank drawing to Interactive problem set, and the list of places at the left.Athanor Home with its six start cards, from Blank drawing to Interactive problem set, and the list of places at the left.

  2. Prefer a desktop app? Install Athanor on Windows. It is the same app in its own window.

  3. On Home, choose Blank drawing. An empty canvas opens in a new tab, with the drawing toolbar at the bottom and panels at the sides.

    An empty Athanor canvas with the drawing toolbar at the bottom and panels at the sides.An empty Athanor canvas with the drawing toolbar at the bottom and panels at the sides.

Tip

Nothing to install, and nothing to sign in to. You can draw, convert and export as soon as the page loads. An arbastro account adds cloud sync, the AI assistant and sharing. See Where your work is saved.

What to do next

Follow Draw your first structure, a two-minute tutorial that draws ethanol and benzene and exports a picture.

Getting startedDraw your first structurePress D for the Bond tool, click the canvas and then click the end atom to grow a chain, point at an atom and press O to make it oxygen, press R then J for benzene, press Ctrl+Shift+K to tidy, and Ctrl+Shift+E to export.

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Last updated Nov 12, 2026