Adaptive diagnostic
Built on the methods behind modern adaptive testing
Three well-studied ideas from educational measurement, working together after every answer.
1 · Pick the next questionItem response theoryThe most informative questionEvery question has a known difficulty. Nebular asks the one closest to the student’s current level, where the answer tells us the most.
2 · Update after each answerBayesian knowledge tracingA probability for every skillEach answer moves the estimate for that skill and the skills linked to it. We stop asking about a skill once we’re sure.
Quadratic equationsP(knows) 0.18
FactoringP(knows) 0.35
Linear equationsP(knows) 0.94
3 · Trace the causePrerequisite graphBack through earlier gradesWhen a Grade 9 skill fails, the next question checks the skills it depends on, up to three grades back.
20 vs 48Fewer questionsSame certainty about what each student knows.
FewerQuestions far too hardStudents mostly see questions near their level, so fewer give up halfway.
Per skillNot just a scoreA mastery estimate for every skill, for each student, class and school.
20 vs 48 was measured on 300 simulated students using our Grade 9 curriculum map.
Learning analytics
Answers to the questions you ask every week
AnswerReteach quadratic equations. 11 of 27 students are stuck on it.It’s a Grade 8 skill. Most of them set up the substitution correctly, then stopped at the quadratic.
Biggest gaps · Grade 9 «В»
Solve a quadratic equation Grade 811 / 27
Factor a quadratic trinomial Grade 89 / 27
Add algebraic fractions Grade 77 / 27
Getting started
From first call to first results in a week
Nothing to install. We set up the school, teachers work in the browser, students join on their phones.
1Day 1We set up your schoolClasses, teachers and what to turn on: practice, homework or both.
2Day 2Teachers get a 30-minute walkthroughEach teacher gets a class code and sees the dashboard.
3First lessonStudents join and take the diagnosticA 6-digit code on the board, then about 20 minutes of questions.
✓Same dayThe class gap map is readyYou see what to reteach and who needs a different approach.
Made for schools in Kazakhstan
National curriculum
Skills are mapped to the ministry’s learning objectives.
Kazakh, Russian and English
Students and teachers can switch language at any time.
Teachers have the final word
Any grade can be changed or re-graded.
Students see what teachers see
A teacher can’t see anything about a student that the student can’t.
No rankings
Students aren’t ranked against classmates.
It says when it isn’t sure
A skill is only marked mastered once the app has enough evidence.