Free
Try the loop on your next 15 mistakes.
$0forever
- 15 mistakes
- Choose 1–4 drills per mistake
- Built-in drill mixes
- Spaced-repetition scheduling
- Keep your drills after the period ends
MCAT prep that learns from every question you miss.
Turn every miss into original drills that target the underlying concept you got wrong, backed by spaced repetition so it sticks.
Trusted by students now at…
Step 1
Add a mistake
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practice-question-32.png
182 KBQuestion 32
A competitive inhibitor is added to an enzyme obeying Michaelis-Menten kinetics. How does this affect Km and Vmax?
A. Km ↓, Vmax =B. Km ↑, Vmax =C. Km =, Vmax ↓D. Both ↓
Why you think you missed it
Knowledge gap
Answer you picked (optional)
ABCD
Correct answer (optional)
ABCD
CancelAdd mistake
The Mistake Loop
Don't just review. Target the concept instead.
Add the question you got wrong
Paste a screenshot or the text, then tell us why you think you missed it. A guess works.
We tell you where the gap is
We pinpoint the specific micro-skill behind the mistake, not just the broad topic, so you know what to fix.
Practice variants that target the gap
Fresh multiple-choice drills built around that skill, spaced out over time so the fix sticks.
See it in action
A two-minute walkthrough.
Watch a missed question turn into a targeted drill, get a real feel for the full loop in under two minutes.
What students say
Built for the test. Trusted by the people who beat it.
“This app completely changed how I study. Instead of just reading explanations, I actually practice until I master the concept.”
“The spaced repetition is genius. I used to forget what I got wrong last week, but now it comes back right when I need it.”
“Finally an error log that actually works. It takes ten seconds to add a mistake and the drills are way better than re-reading.”
Pricing
Start free. Upgrade when the loop clicks.
Choose 1–4 drills per mistake. Access to your drills and analytics doesn't expire.
Monthly
Most popularFor the month of a full-time study sprint.
$25/ month
- 250 mistakes / month
- Choose 1–4 drills per mistake
- Save custom drill mixes (up to 20)
- Full analytics on weaknesses and trends
- Cancel anytime; keep access through the period
Yearly
For the full prep cycle and retakes.
$169/ year
- 3,000 mistakes / year
- Choose 1–4 drills per mistake
- Save custom drill mixes (up to 20)
- Full analytics on weaknesses and trends
- Best $ per mistake of any plan
Also available: a 4-month plan for $89. See all plans.
FAQ
Questions people ask before they sign up.
How is this different from Anki?
Anki flashes the exact card you created, so you end up memorizing the question instead of the concept. We generate brand-new multiple-choice drills that target the underlying skill, so you're practicing understanding, not recall of a specific card.
How many drills do I get per mistake?
Roughly four original drills per mistake you add. Each is a full multiple-choice question with stem, options, and explanations, scheduled with spaced repetition so you see them again right before you would have forgotten.
Do I have to upload screenshots?
No. You can paste the question as plain text, upload a screenshot, or both. We parse either.
Does my access expire if I stop paying?
No. Your existing drills and analytics stay available after your period ends. You just can't add new mistakes until you're on a paid plan again.
Is there a free trial?
The free plan is permanent, not a trial. You get 15 mistakes (~60 drills) to decide whether the loop works for you before you pay.