Learn from every answer
Every choice comes with an explanation. See why the correct answer works and why each distractor falls short.
Digital SAT® Reading & Writing
Aptitude,
applied.
Aptimetry gives you more than a score. Work through 13,000+ questions, read an explanation for every answer choice, and return to the skills that need the most attention.
Available on iPhone and iPad. Try everything for seven days. You will not be subscribed automatically.
Full Reading & Writing coverage.
Every domain and all ten question types.
13,000+practice questions
10question types covered
2,500+vocabulary words
0accounts or ads
Built around feedback
Review the result, then practice the right skill.
Aptimetry shows what you missed and why. Your next drill uses that information instead of starting from scratch.
Work on what needs attention
Adaptive drills mix new questions with review. Missed questions and older material return when they are most useful.
Cover the full exam
Practice all four Reading & Writing domains and all ten question types, with enough depth to build real familiarity.
Try a real Drill question
Choose an answer. See exactly why.
This question comes from Aptimetry. Choose any answer to see immediate grading, inspect the explanation for every choice, and preview another way the on-device tutor can teach the same idea.
- Immediate feedback while the reasoning is still fresh
- Every choice explained so distractors become useful practice
- Optional tutoring generated privately on supported devices
Interactive preview · Choose an answer
DrillAdaptive questions
1 / 10
In a 2018 study, Alejandra Dawson found that the ion-product constant of water, Kw, calculated from activities of hydrogen and hydroxide ions in pure water at 25 °C, ______ 1.0 × 10−14.
Which choice completes the text so that it conforms to the conventions of Standard English?
Not quite
Form, Structure, and Sense
Why B misses
On-device AI Tutor preview
In Aptimetry, this is AI-generated on your device. Use the verified explanation above for the answer.
Progress you can use
Know what to study next.
The mastery map tracks the skills you have practiced, the ones you have learned, and the ones due for review. Focus Next recommends a specific place to begin.
- Skill-by-skill mastery across every exam domain
- Spaced review resurfaces material before it fades
- Reminders and streaks help you keep a steady routine
Interactive preview · Open a skill group
Learning Map
Your Progress
Updates as you answer questions.
2558
Seen
2130
Mastered
512
To review
Mastery Map
Your current level in each skill.
Progress toward mastery
Four ways to study
Choose the right kind of practice.
Learn a concept, run an adaptive drill, review at the right interval, or take a realistic timed set.
Build the concept
Review words, grammar rules, examples, pronunciation, and word parts before testing your recall.
Target the gap
Choose a broad adaptive mix, one exam domain, or a single question type.
Return at the right time
Use spaced review to revisit material just before it starts to fade.
Take a timed set
Choose a timed set, including a 27-question module, then flag questions and review your results.
Realistic timed practice
Practice with a real countdown.
The countdown keeps running if you leave the app. On supported devices, you can also see it in the Dynamic Island or on the Lock Screen. When time runs out, the set closes automatically. Flag questions, review them before submitting, and see which skills need more work.
Interactive preview · Answer or flag
TestTimed questions
11:41
Even in fading evening light, the veteran birdwatcher could tell a distant hawk from a crow by the faint barring on its wings. Her visual _____, sharpened over decades of patient observation, let her pick out tiny details that others, squinting at the very same sky, simply failed to notice.
Which choice completes the text with the most logical and precise word?
Question review
Answered0
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Private by design
Your study data stays yours.
No account is required. Aptimetry has no ads and does not send your study activity to us. Your questions, progress, learning model, and supported AI tutoring stay on your device. Optional progress sync uses your private iCloud account.
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Start practicing with a clearer plan.
Try the complete app free for seven days. No subscription begins automatically. After the trial, you can still use one adaptive drill a day and complete all of your scheduled reviews.
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