Pricing
Pick the plan that fits how you study.
Start with a free scan, then keep going with Scan Standard. New here? Try the interactive tour free, or read the free lesson for every topic.
Start here
Free scan + library
Free
Then Scan Standard, $15/month
- 1 homework scan now, no sign-up
- 1 more scan with a free account
- Question Bank: every mechanism and practice problem in Orgo 1 and Orgo 2
- Feedback on each arrow, worked solutions and quiz mode
Most popular
Scan Standard
$15 / month
or a 30-day pass for , one payment
Pay the pass by card, or in cash at OXXO
- 40 scan credits a month, about 36 problems
- Snap a reaction from your homework and draw its mechanism, every arrow checked
- The whole practice library, Orgo 1 and Orgo 2
- A scan that fails uses no credits
Not sure yet? Scan 1 problem free now, no sign-up; 1 more with a free account.
Most credits
Scan
$30 / month
- 80 scan credits a month, about 73 problems
- Everything in Scan Standard, with twice the credits
- Refill credits whenever you run out
- Advanced lane (beta) for reactions beyond the syllabus
3-day money-back guarantee on your first payment (14 days in the EU and UK).
More ways to pay
30-day pass
Everything in Scan Standard for 30 days: the library and homework scans with Scan Standard's monthly credits. One payment, nothing renews. Your local price is shown before payment.
Pay by card, or in cash at OXXO: checkout gives you a voucher, and your pass starts once you pay it at the store.
Scan Lite
20 scan credits a month, about 18 problems, plus the practice library.
$12 / month
À la carte
One reaction for $3 (US; your local price is shown before payment): four scan credits, no subscription.
Refills
Refills: credits for $8 whenever you run out, metered like the plan’s credits.
Greatest hits
Yours to keep: the 30 greatest hits of Ochem 1 & 2 as interactive mechanisms on your account and as an offline file. One payment, nothing renews; 14-day refund.
$5 one-time
Teaching a course?
Class plans per student, with a free instructor account.
Class plan: $45 per student per term (6 months). Your instructor account is free: build and share problem sets, run live naming sessions, follow progress. Included: a custom sequence of mechanism problems built with you from your syllabus. Students who want to scan their own problems add Scan individually.
Compare plans
| Feature | Free | Scan Standard | Scan |
|---|---|---|---|
| Library: every mechanism with lessons, guided arrows, worked solutions, quiz mode, 3D models and R/S labels | Included | Included | Included |
| Homework scans | 2 free scans: 1 without sign-up, 1 with a free account | 40 credits a month, about 36 problems | 80 credits a month, up to 20 credits a day; a typical scan uses about 1 credit, a long one 2–4 |
| Advanced lane (beta) for reactions beyond the syllabus | With a free scan, while beta seats are open | Included | Included |
| Need more credits? | Get Scan Standard | Upgrade to Scan and pay only the difference | Buy more credits whenever the month’s run out |
| Billing | Free | Monthly, cancel anytime | Monthly, cancel anytime |
Monthly plans: the details
What is a credit, and how many do I get?
Scan is priced for your country, and its monthly credit allowance follows the price. A credit is a unit of work, not a problem. Each scan is metered by the work its build takes: a typical mechanism uses about 1 credit, working backwards from a product about 2, and a long or tricky mechanism 2–4. Before you build you see the estimate; once it is built the scan shows the exact amount, to one decimal. A build never uses more than you have left, and a scan that fails uses none. Scan includes up to 20 credits a day.
Includes 80 credits a month, up to 20 credits a day. 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. Reactions beyond the OChem 1 & 2 syllabus can use the advanced lane (beta), usually 3–6 credits; we say so before you build.
| Monthly price | Credits a month | Credits a month on Scan Standard |
|---|---|---|
| $30 | 80 | 40 |
| about $24 | 64 | 32 |
| about $18 | 48 | 24 |
| about $12 | 32 | 16 |
| about $9 | 24 | 12 |
Prices outside the US are set in your local currency at about these amounts. Scan Standard includes half of Scan’s monthly credits.
How does billing work?
- One account, full access to every available course.
- Billed monthly at the price above, which Stripe checkout also shows before you pay. Renews automatically each month until you cancel.
- Local prices at checkout. Need more? Upgrade to Scan any time and pay only the difference for the month.
- The Question Bank is free with an account, no card. Paid plans: secure checkout by Stripe, no account needed to pay; your account is set up from the email you use there.
Can I cancel or get a refund?
- Cancel anytime from Manage subscription in your account; access continues until the end of the month you already paid for.
- Money-back guarantee: a full refund of your first monthly payment if you ask within 3 days of it, once per person and payment card. EU and UK residents also have a legal 14-day right to cancel for a full refund.
Not sure yet? Take the free interactive tour, or create a free account and scan a reaction free.