Synlog
A private chemistry lab notebook in your browser
Draw structures, work out stoichiometry, write up procedures, and export everything to PDF. There are no accounts and no server - your notebook lives only on your own computer or your Google Drive.
Built for synthetic chemists, graduate students, and teaching labs.
What it is
This is an electronic lab notebook (ELN) for synthetic chemistry that runs entirely in your browser. Organize your work into a notebook of compounds and reactions, keep the chemistry and the numbers together, and produce a tidy record you can archive or share.
Draw structures
Sketch compounds and reactions with the built-in Ketcher editor. Look up molecules from PubChem by name.
Stoichiometry tables
Enter any amount - mass, moles, volume - and the table derives the rest, tracks equivalents, and flags the limiting reagent.
Procedures
Generate a draft experimental procedure from your reaction and conditions, then edit it to match what you actually did.
Export to PDF
Produce a clean, human-readable PDF of your notebook - with the underlying data embedded so it can be reopened later.
How a notebook is organized
A notebook is your whole project in a single file. Inside it live two kinds of entries - compounds and reactions - each with its own short code, linked the way they are at the bench so the structures, the numbers, and the write-up never drift apart.
Compounds are your building blocks
Each compound holds a drawn structure, identifiers and properties pulled from PubChem, and a molecular weight. Define a reagent, catalyst, or product once and it lives in your notebook under a unique code, ready to drop into any reaction.
Reactions bring them together
A reaction assembles compounds - reused from your notebook or created on the spot - as reactants, reagents, catalysts, solvents and products. The stoichiometry table works out the amounts and equivalents, and you can generate a draft procedure straight from it.
Your data stays yours
There is no backend and no account to create. Nothing you draw or type is ever sent to a server we control - your notebook is saved only where you choose to put it.
Save on your computer
Save the notebook as a file on your own hard drive, or keep it in your browser's local storage. It never leaves your machine.
Store and collaborate via the Google Drive
Save notebook on your own Google Drive. The app can only read and write files it created. You can share a Google Drive folder with colleagues and work on the same notebooks together.