Arrow Lab

Opening Arrow Lab…

Organic chemistry, one arrow at a time

Master mechanisms by drawing the arrows yourself.

An interactive organic-chemistry mechanism tutor: draw curved arrows step by step and get instant feedback on every move. Photograph a reaction from lecture notes or a textbook to practice its mechanism.

Take the interactive tourSolve a real mechanism now. No account needed.

Scan Standard: every mechanism and homework scans, at half the price

  • Feedback on every arrow in all mechanisms
  • Guided arrows, worked solutions, quizzes
  • 3D models, plus R/S and E/Z labels
  • Photograph a reaction from your notes or textbook and practice its mechanism, arrow by arrow

Cancel anytime

No account needed to pay. Secure checkout by Stripe.

HO C H H H Br
Correct: the oxygen lone pair attacks carbon from the back as the C–Br bond breaks.
  • interactive mechanisms
  • practice problems
  • topics with core lessons

Teaching a course? , and you can build your own mechanisms in the reaction editor.

Create your account

We will email you a 6-digit code to choose your password, then you can subscribe for full access.

  1. Snap
  2. Confirm
  3. Draw

Reaction scans

Scan a reaction

Snap it. Draw it. Every arrow checked.

Subscribe to scan your own

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1 free scan now, no card or sign-up; 1 more with a free account. After that, Scan Standard is $15 / month. Scan Standard and Scan Lite include a monthly allowance of scan credits. A credit is a unit of work, not a problem: a typical scan uses about 1 credit, working backwards from a product about 2, and a long or tricky mechanism 2–4. You see the estimate before you build and the exact amount once it is built. Below is a real scan, start to finish.

Snap one reaction from your notes or textbook. Arrow Lab reads it and turns it into a mechanism you practice, arrow by arrow.

Your homework photo in, the mechanism out, arrow by arrow.

Draw the arrow first — this is how every scan comes back.

  • A forward reaction with reagents
  • Working backward from a product
  • One reaction per photo

1 free scan now: no card, no sign-up. 1 more with a free account.

Then Scan Standard is $15 / month.

Your scans

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    Scan Lite

    Your receipt and the code to open your account go here. No password needed to pay.

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    Administrator

    Instructor invites

    Anyone can create an account; students subscribe monthly or join through their instructor’s classroom invitations. Instructor access is invite-only: invited instructors create their account with the invited email and get a 30-day free trial, during which they can also share private problem sets with their students through a join link.

    No email is sent. Tell them to create their account at this site with this address.

    Requests

      Invited

        Gift access

        Gift access grants
        EmailDaysStateEnds/expiresNoteManage
        Shareable gift links
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        Private problem sets

        Listed students see the set’s published problems on their dashboard, with or without study access; membership opens only these problems. Choose problems in the reaction editor under Sharing.

        Feedback

        How is Arrow Lab working for you?

        How useful is it so far? (1 = not yet, 5 = very)

        Administrator

        Feedback

        Administrator

        Scan reports

        Students' reports of failed or wrong scans, open ones first. Photos are only here when the student ticked the box, and are deleted 90 days after they were sent. Re-run sends the photo through the reader again as a scan of your own.

        Administrator

        Scans

        Every user's reaction scans, newest first. Scans a student deleted are not listed. Open mechanism shows the published reaction in the learner, in a new tab, exactly as the student sees it; any progress you make there is saved to your own account.

        Subscribers

        Each paying account in its current credit window (its billing period). Collected is Stripe's US-dollar net, after fees, of the charges in the window. Black / red is collected minus model cost; at window end projects the current pace of credit use, capped at the allowance, at the account's own model cost per credit. As JSON: /api/admin/subscribers.

        Spend this month

        Model spend per user this UTC month (failed and deleted scans included) against the plan's Stripe net in US dollars. The rule: spend at most half of net.

        Report this scan

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        Your photo (optional)

        Your photo is only sent if you tick the box. How we handle reported photos

        Administrator

        Visits (last 14 days)

        Administrator

        Content review

        New or changed exercises stay hidden from students and instructors until an administrator approves them. An approval covers the current version only; any later edit brings the exercise back here. Preview opens the exercise here, with Approve and Next beside it; anything you do in it saves to your own progress.

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            Classroom tools

            My classroom

            1Name your class

            2Choose seats and pay for the term

            Prefer an invoice for your department? Email support@arrowlabchem.com.