Keen
24,322+ questions · 77 courses · every AP

You already know
half of what you
keep revising.

Keen learns which topics you actually get wrong, then spends your study time there. Pick your real classes, unit by unit, and stop re-reading the chapters you already had down.

Free forever. No card. Takes about a minute.

Re-reading is not studying

Most study apps give you a pile of cards and let you shuffle them. You end up drilling the easy ones because they feel good, and quietly avoiding the three topics that will actually cost you the grade.

A practice exam answer sheet, a notebook of worked-through problems, and a stack of index cards on a desk
3 topics usually account for most of a dropped letter grade
0 other apps that ask which classes you are actually taking
159 courses mapped down to individual units, not vague subjects

What makes this different

◎

It knows your actual timetable

Add AP Biology, Honors Algebra 2 and English 11 and you get those courses, broken into the units your teacher is actually teaching. Other tools make you search a library and hope someone made a decent set.

↻

It hunts your weak spots

Every answer moves a rating for that specific topic. Get Mendelian genetics wrong twice and it comes back tomorrow, then next week, then only once it has stuck. You do not choose what to revise; the gaps choose.

✎

Real AP exam practice

Section timings, question counts and weightings taken from the official exam pages, plus free-response prompts with the real scoring rubrics. Where an exam has not been verified yet, it says so rather than inventing a format.

⚡

Five ways to study one set

Adaptive practice, flashcards, a timed match game, full practice tests and a queue of only the questions you have missed. Same content, different pressure.

Free, properly

Not a trial. The free plan has no expiry and no card. Premium removes the daily caps and unlocks the timed modes.

Free

$0
  • ✓ 15 Learn questions a day
  • ✓ 10 Review questions a day
  • ✓ Unlimited flashcards
  • ✓ One subject at a time
  • ✕ Match, practice tests, AP exams
Most popular

Premium

$4.99/mo

or $29.99 a year — works out at $2.50 a month

  • ✓ Unlimited questions
  • ✓ Every class you are taking
  • ✓ Match, practice tests and AP exam practice
  • ✓ Full mastery dashboard
  • ✓ Weak-topic review queue

Study Group

$3.99/seat/mo

Three people or more

  • ✓ Everything in Premium, each
  • ✓ Cheaper per person than going solo
  • ✓ Shared channels per shared class
  • ✓ Leaderboard ranked on improvement

Start with your worst subject

That is where the fastest gains are.

Common questions

What does Keen do differently from Quizlet or Anki?

Quizlet and Anki both wait for you to decide what to study. Keen maps the actual courses you are enrolled in, unit by unit, and tracks which units you keep missing. Practice is then routed at your weakest unit automatically, so you stop re-studying material you already know.

Is Keen free?

Yes. The free plan gives you practice every day in one subject, with no card required. Premium is $4.99 a month or $29.99 a year for unlimited questions across every subject. A Study Group costs $3.99 per seat per month from 3 people, and one payment upgrades everyone in the group.

How does Keen stop me memorising the answer instead of the material?

When you get a question wrong it comes back later reworded rather than identical. Recognising a familiar sentence is not the same as knowing the concept, so changing the wording forces you to re-derive the answer. Repeats are spaced out over increasing intervals as you get them right.

Which courses does Keen cover?

AP, honors, standard high school, and introductory college courses across science, maths, English, social studies, computing, and electives. Every course is broken into its real units, and each course page lists exactly how many questions each unit currently has.

What age do I need to be to use Keen?

Keen is for students aged 13 and over. Accounts require a birth year at signup, and anyone under 13 cannot create one.

Looking for a specific class? See all 77 courses with questions, each broken down by unit.