Trust

The web app is served from athanor.arbastro.com/app. The Windows app is built from the same code with Tauri and published by our release script to update-athanor.arbastro.com. The current version is 0.3.41, released November 12, 2026.

• Updates are signed. Every update carries a signature from our updater key, and the app checks it before installing.
• The installer is not code-signed yet. Windows SmartScreen may warn you the first time. Choose More info, then Run anyway. A code-signing certificate and a Microsoft Store listing are on the way; until then, the web app needs no install at all.
• There is no Mac or Linux app. On those systems Athanor runs in the browser.
• The desktop app needs a free arbastro account to start. The web app needs no account to draw.

Four lines from our privacy policy, word for word:

• Your drawings

  “…your drawings live on your device. They go to our servers only when you sync, share, or collaborate on them.”

• The assistant

  “Signed out, Athanor sends nothing to any AI provider.”

• What the assistant is sent

  “We do not store what you send or what comes back.”

• The app’s two anonymous usage events

  “These carry no account ID and no stored IP address.”

Route planning and product prediction send the structure to our chemistry service at athanor-ml.arbastro.com, on arbastro’s own server, and only while you are signed in. It keeps nothing about a request beyond its method, path, status and time; a route search you watch as it runs is held in memory for 10 minutes, then deleted. Separately, while you are signed in the app can record which predicted products and routes you keep, change or turn down. Those records stay on your device and are never uploaded; they leave it only if you export them to a file yourself. Recording is on by default outside the EU, EEA and UK, and Settings, AI turns it off.

The assistant runs on Anthropic’s Claude models through our server, which stores neither what you send nor what comes back. Anthropic handles the request under its commercial terms, which do not allow it to train on your data. On Suite you can use your own key from a supported provider instead, and then requests go from your device to that provider directly. This website counts its visits with Google Analytics and a notification to our staff; section 8 of the privacy policy says exactly what is sent.

An .athanor file is a ZIP archive. Inside are a document description in JSON and every structure as its own standard MOL V3000 file. Unzip it with any tool and the chemistry is there, readable by RDKit, Open Babel or ChemDraw, whether or not Athanor still exists.

Athanor also opens and saves ChemDraw’s CDX and CDXML, and MOL, SDF, RXN and SMILES. Every change to the app is tested by sending a large set of PubChem molecules through SMILES, MOL V3000, CDXML and MRV and checking that each keeps its formula and every R/S and E/Z label.

Structures the assistant draws are checked after every step against the Chemical Weapons Convention Schedules 1 to 3, the Australia Group list and controlled-substance schedules. A match undoes what the assistant did. Requests are rate limited and logged for review.

Purchase links are hidden for compounds on US Schedules I to V, DEA List I, EU Category 1 drug precursors, EU restricted explosives precursors and CWC Schedules 1 to 3. When you bring your own AI key, the screening runs on your device rather than on our server.

Safety data shown for a compound comes from official GHS sources and is shown only when what you drew matches a known compound exactly. It does not replace your supplier’s safety data sheet.