Question 1

Is Athanor really free?

Accepted Answer

Yes. The full editor is free with no trial period and no watermark, and you can use it for commercial work and publication. A free account includes 150 AI credits a month for the assistant. The Suite subscription is $4.99 a month and raises that to 300 credits, adds the more capable model, and lets you use your own API key. Drawing, 3D, orbitals, the library, export, and our own prediction and route models do not use credits at all.

Question 2

Does it run in the browser, or do I need to download it?

Accepted Answer

Both. The browser version is the full editor with nothing held back, so you can start drawing without installing anything. The desktop app adds reliable file-system access for automatic local backups and works offline once you’ve signed in. Your work syncs between them.

Question 3

Is Athanor on the Microsoft Store?

Accepted Answer

Yes. Get Athanor from the Microsoft Store (apps.microsoft.com/detail/9nzt1t327xq0) for Windows 10 and 11, and it updates itself. If you would rather not use the Store, the installer (.exe) is under the arrow beside every download button.

Question 4

Can I open my ChemDraw files?

Accepted Answer

Yes. Athanor opens .cdx and .cdxml files directly, along with MOL, SDF, RXN and SMILES. Your existing work comes across without needing to redraw it.

Question 5

How reliable are the predicted products and routes?

Accepted Answer

Good on common chemistry, and worth checking on unusual chemistry. Predictions come from our own models, trained on published reactions. Routes are ranked, and each one shows its steps, its starting materials and what it still needs, so you can judge it rather than take it on faith. Route planning and product prediction need a free account.

Question 6

Where does the safety and property data come from?

Accepted Answer

Mostly PubChem, with the original depositor cited on every value. Each property shows its source, and where a value isn’t available we say so rather than estimating silently. Safety classifications come from official GHS sources and are only shown when the structure you’ve drawn matches a known compound exactly, by InChIKey. Predicted values, like calculated logP, are labeled as predictions and shown separately from measured ones. We only use openly licensed data, which is why some values you might expect from a handbook aren’t here.

None of this is a substitute for the safety data sheet from your supplier.

Question 7

Who can see what I draw?

Accepted Answer

By default, nobody. Your documents are yours and aren’t shared unless you share them. Live collaboration only applies to documents you explicitly invite people to, and uploads to the community library are opt-in and clearly marked as yours.

Separately, when you approve or reject a suggested route, we record that decision to improve the models. It’s structures and outcomes only, linked to a hashed account identifier rather than to you or your documents. You can turn it off in settings at any time, and turning it off also deletes what was recorded before.

	Free Students and anyone starting out $0 Download	arbastro Suite Lite For learning and teaching ~~$4.99~~ $4.17/mo billed $49.99 yearly · save $9.89 Start 7-day free trial Then $4.17/mo billed yearly ($49.99), or $4.99 monthly. Cancel any time before the trial ends.	Most popular arbastro Suite Plus Best for active research ~~$19.99~~ $16.67/mo billed $199.99 yearly · save $39.89 Get Suite Plus	arbastro Suite Ultra For schools, labs and companies ~~$99.99~~ $83.33/mo billed $999.99 yearly · save $199.89 Get Suite Ultra Talk to us
AI credits a month	150	300	1,000	2,500
Assistant models	Haiku and Sonnet 5.5	Haiku, Sonnet and Opus 5.5	Haiku, Sonnet and Opus 5.5, Fable 5.2	Haiku, Sonnet and Opus 5.5, Fable 5.2
Your own AI provider key	–
Cloud storage	10 MB	100 MB	500 MB	3 GB
Across arbastro	–	and other arbastro Suite Lite perks	and other arbastro Suite Plus perks	and other arbastro Suite Ultra perks

	Athanor	ChemDraw	ChemDoodle	Marvin	Octet Draw	Discontinued Aug 2026ChemSketch
Price & access
Price	Free	Prime $700/yrProfessional $1,355/yr	$199/yror $999 lifetime	$29/mo academic$99/mo commercial	Free	No longer sold
Free for commercial work		–	–	–		–
Full editor in the browser		Enterprise plan	Developer toolkit		–	–
Prediction
Products predicted as you draw		–	From arrow pushing	–	–	–
Retrosynthesis route planning		–	Manual disconnections	–	–	–
Property prediction					Basic
AI assistant that draws and animates		–	–	–	–	–
Teaching
Problem sets with automatic grading	21 question types	–	–	–	–	–
Mechanism checking		–	–	–	–	–
Moodle XML and QTI export		–	–	–	–	–
Drawing & visualization
2D structure drawing
3D models					–
Orbitals and MO diagrams		Orbital palette		–	–	–
Animated mechanisms		–	–	–	–	–
Biopolymers (HELM, peptides, DNA)			–	–	–	–
Data & workflow
Compound library with cited safety data		PubChem add‑in	–	–	–	–
Live collaboration	In testing	Enterprise plan	–	–	–	–
Opens ChemDraw files
Name to structure for any IUPAC name	Online				Offline	–
Platforms
Desktop app	Windows	Windows, Mac	Windows, Mac, Linux		Windows, Mac, Linux	Windows
Mac and Linux	In the browser	Mac				–
Works offline	Desktop app			Desktop
Open source	–	–	–	–	Apache‑2.0	–
Where others do more
¹H and ¹³C NMR prediction	Predicted, AI					–
Fully offline, no account	–			–
Office and ELN integration	–		LabArchives		Office, on Mac	–

Draw the molecule. Athanor plans the route.

Caffeine

Retrosynthesis as you draw

What it does for your research

It knows what you drew

3D and orbitals from the same drawing

Names and stereo you can check

Search your documents by structure

Switching from ChemDraw

Plans and pricing

How Athanor compares

Athanor in your AI assistant

Your data

FAQ

Get Athanor