Free practice problems for organic chemistry, with spaced repetition built in. No account needed.
Answer a question, and the app remembers whether you got it right. Reactions you miss come back sooner; ones you've already got down show up less often — so your practice time goes to your actual weak spots instead of reactions you've already learned.
Reviews reactions on a schedule, bringing back the ones you keep missing.
This app quizzes you on organic chemistry reactions: pick the major product, then see whether you were right and why. Every question you answer gets scheduled for review — miss it and it comes back tomorrow, get it right and it comes back further out each time, so your practice time goes toward what you actually need. Practicing for an exam? Exam Prep Mode skips the schedule entirely and lets you drill chosen topics or simulate a timed exam instead.
Foundational Challenging Advanced
Copy a short code here, then paste it into "Restore progress" on the other device.
Pick where your course is. Each choice ticks its topics in the list below, so you can untick any your course hasn't reached yet. This never touches your saved progress.
With all three on, each topic starts easy and harder problems unlock as you master it. Turn some off to choose for yourself.
Untick any topic your course hasn't covered yet.
Ignores your daily schedule and pulls straight from the topics below — foundational problems first, harder ones later, your weakest material surfaced first within each.