Notes that draw
Type notes with LaTeX maths, then draw structures, reactions and curly-arrow mechanisms right in the page. Open any drawing in 3D and watch it step by step.
Free organic chemistry notebook
Draw themechanism.Get the chemistry.
Bondline is a notebook for organic chemistry. Write notes, draw structures and curly-arrow mechanisms, watch them play in 3D, and practise IUPAC naming and spectra, all in your browser.
A notebook that understands chemistry. Draw a structure and it knows the name. Add curly arrows and it plays the mechanism in 3D. Ask what NaOEt does to 2-bromobutane and it tells you which product wins, and why.
How it works · SN2 in four steps
Scroll the mechanism.
- Draw the arrowsA lone pair on hydroxide attacks carbon, and the C–Br bond breaks toward bromine.
- Backside attackThe nucleophile comes in opposite the leaving group, so Bondline checks the geometry too.
- Transition stateFive groups around carbon, partial bonds to O and Br. That's the ‡ peak on the energy diagram.
- InversionThe three hydrogens flip like an umbrella in the wind. Bromide leaves, methanol forms.
In Bondline you draw this once, press 3D, and watch it play.
Everything in one notebook
Eleven tools.
One place to revise.
IUPAC naming
Lessons and a naming quiz with progress for each topic. Type a name and Bondline draws the structure; draw a structure and it gives the name, with R/S and E/Z.
Reaction predictor
Give it a starting material and reagents. It weighs SN1, SN2, E1 and E2, draws major and minor products, and explains the choice.
Spectra practice
Lessons on IR, ¹H NMR, ¹³C NMR and mass spectrometry, plus hundreds of practice questions built from real compounds.
Orbitals in 3D
MO diagrams with bond order and magnetism, Hückel π orbitals for conjugated and aromatic systems, and orbitals you can rotate.
Glossary of 300+ terms
Solvents, reagents, abbreviations and named reactions are highlighted in your notes. Hover or tap for a definition and structure.
Flashcards
Turn any line into a card, with maths or a structure on either side. Spaced repetition decides what to show you next.
Shared notebooks
Invite classmates by email or link. Edit together live, or let people view and comment.
Synthesis problems
Plan a route from starting material to target. Pick the reagents for each step; wrong choices tell you what they'd make instead.
Classes
Lecturers set naming quizzes, spectra, mechanisms and synthesis problems. Students join with a code and scores come back automatically.
Present and export
Turn a note into slides: present it full screen, stepping through curly arrows one at a time, or export a PowerPoint file.
300+glossary terms highlighted in your notes
34reactions with every mechanism step drawn
4kinds of spectroscopy to practise
$0no ads and no subscription
Made for how you actually study.
Works offline
Install it on your laptop, tablet or phone like an app. Notes, drawings and quizzes keep working without a connection.
Syncs when you sign in
Sign in with Google or an email to keep notes and quiz progress in step across devices. Or don't: everything still saves on your device.
Exports cleanly
Print or save notes as PDFs with selectable text and sharp vector drawings, ready to hand in or revise from.
Free guides
Stuck on something? Start here.
Questions
Is Bondline free?
Yes. Bondline is free to use, with no ads and no subscription.
Do I need an account?
No. Without an account, your notes and progress are saved in your browser on that device. Signing in with Google or an email and password lets you sync across devices and use shared notebooks.
Does it work on phones and tablets?
Yes. Bondline runs in any modern browser and can be installed to your home screen. Drawing works with a finger, mouse or stylus, and the pen is pressure-sensitive.
Who is it for?
Students taking organic chemistry at school or university (A-level, IB, AP, STPM, foundation and first- or second-year courses) and anyone revising curly-arrow mechanisms, IUPAC nomenclature or spectroscopy.
Can teachers and lecturers use it?
Yes. Make a class, share its code, and set naming quizzes, spectra practice, mechanisms or synthesis problems. Scores come back to you automatically, and you can download them as a spreadsheet. You can also present any note full screen or export it to PowerPoint.
What happens to my notes?
They stay yours. Read the privacy policy for what is stored, where, and how to delete it.
Ready when you are