For chemistry, analytics and pharma development
Draw a molecule.Check it right away.
Interpret spectra, estimate shelf life, see tox risks, plan routes. CovaSketch computes on the molecule you draw, in the browser or directly in Claude and ChatGPT.
Free plan to start. Nothing to install, no IT involved.
Works inside your AI
- Claude
- ChatGPT
- Cursor
- VS Code
- Claude Code
Two ways in, the same tools
Work where you already work
In the browser
Draw, right-click, result
The structure editor in your browser. Formula and molecular weight right away, every analysis on the same molecule with a free account.
Open the sketcherIn your AI
Claude and ChatGPT do the maths
CovaSketch as a connector in Claude, ChatGPT, Cursor or VS Code. Your assistant calls a tested tool for every number instead of guessing.
Connect in three stepsHow to start
Three steps to your first analysis
- 01
Sign up free
Create an account with your email address. Nothing to install, no IT involved.
- 02
Draw or ask
Right-click in the sketcher, or ask Claude and ChatGPT in your own words.
- 03
Use the result
Numbers, charts and the tool version, traceable for colleagues and QA.
What you get done
One bench for the questions about a molecule
Every analysis runs on the same molecule. Same input, same result, with the version recorded.
Check the structure
Interpret spectra
Estimate stability
Plan a route
Screen toxicology
Solubility and formulation
Who it is for
For everyone who needs an answer about a molecule
Analytical and QC
Check a spectrum against its structure, place unknown peaks, prepare methods before the instrument is free.
Medicinal chemistry
Rank candidates by ADMET, tox alerts and synthetic effort before anyone spends a week on a synthesis.
Formulation and process
Work through solubility, pH profile, crystallisation and design of experiments instead of testing every variant in the lab.
CMC and regulatory
See ICH M7 classes, ICH Q1E shelf life and degradation pathways early, with the version for your records.
Independently measured
Language models guess at chemistry. With CovaSketch they compute.
MolecularIQ is a peer-reviewed chemistry benchmark by Bartmann et al. (Klambauer Lab, JKU Linz, ICLR 2026). We did not design it; we measured leading models against it, with and without CovaSketch tools. Grading is symbolic, with no judgement calls and no partial credit.
Model alone
14 to 41 %
correct
With CovaSketch
76 to 92 %
correct
Source: MolecularIQ, arXiv:2601.15279, dataset and code public.
Free calculators
Try it now, no account needed
Each calculator runs the same calculation as the full version. Enter values, see the result. With a free account you keep going on the molecule you drew.
ICH M7 quick classification
Structural alert and statistical model in one pass, with class, mechanism and confidence.
Open calculatorMolecular formula from exact mass
Candidate formulas for a measured m/z, with mass error in ppm, RDBE and a plausibility score.
Open calculatorDrug-likeness: Lipinski, Veber, QED
Molecular weight, LogP, hydrogen bond donors and acceptors, TPSA, plus Lipinski, Veber, Ghose, QED and synthetic accessibility.
Open calculatorIsotope pattern from molecular formula
Theoretical isotope pattern with relative intensities, the cross-check for every formula assignment.
Open calculatorHPLC starting method
Column, eluents, gradient and flow as a starting point for the first injection.
Open calculator
Pricing
Start free, grow when it fits
Free, Pro and Max with a weekly allowance, cancel monthly. When the allowance runs out, nothing is charged automatically. Licences for teams and companies on request.
Security
What happens to your data
Your inputs are processed only for your request, not stored permanently and never used for training.
Servers in the EU
No training
Deletion on request
Guides
Computed, explained, verifiable
Practical articles on design of experiments, prediction models, docking and formulation, each with real numbers.
Response Surface Methodology, End to End
A response surface methodology tutorial with a worked example: 18-run CCD, quadratic fit R2 0.9988, optimum with CIs, design space and residual.
Read articleHigh Concentration Antibody Viscosity: Predict It Early
High concentration antibody viscosity decides whether your mAb can be a subcutaneous injection. Predict it from sequence before formulation work begins.
Read articlepLDDT Explained: When to Trust a Predicted Structure
pLDDT interpretation for practitioners: what the bands mean, why a global mean hides the region you care about, and real numbers on MSA depth.
Read article
FAQ
Frequently asked questions
What does CovaSketch cost?
The free plan costs nothing and includes a weekly allowance of analyses. Pro and Max are booked monthly inside the app and can be cancelled at the end of any month. All prices are on the pricing page.
Do I need to install anything or involve IT?
No. The sketcher runs in the browser. For Claude, ChatGPT, Cursor or VS Code you add CovaSketch once as a connector; the docs walk you through it.
Is an AI doing the maths, or a tool?
The numbers come from tested calculation tools. Your AI decides which tool to call and explains the result. So it computes instead of guessing.
What happens to my structures and data?
Your inputs are processed only for your request, not stored permanently and never used for training. Your data feeds no training, neither ours nor that of service providers we use. This is set out in the data processing agreement, not just on this page. The computing tools are deterministic: same input, same result.
How traceable are the results?
Every call is recorded with its tool version. Same input, same result. The result is a calculation that your experts review and sign off.
Is CovaSketch available for whole teams?
Yes. For groups and companies there are team licences, invoicing instead of card payment, a DPA and SSO, and operation on your own servers. Get in touch via the pricing page.
Free plan
Your next molecule, checked today.
Create an account, draw a molecule, see your first analysis. Upgrade to Pro or Max later, inside the app, when you need more.