Two engines. One exam.
A personal engine that knows your gaps and a cohort engine that compounds with every student in your course. Upload your material, join your cohort, and onbridger your way through exam season.
Built at Bocconi · Compounds across cohorts
The cohort engine
Compounding moat
One cohort, many students, one engine.
Every student answering questions in your course sharpens the same engine. Concept identity persists across cohorts. Misconceptions aggregate at three or more observers. Item difficulty refits weekly to real responses. By your second exam term, the bank is calibrated by everyone who came before you.
47 students · Prof. Rossi
Cohort confusions
Canonical concepts
Re-extractions and new students bind to the same concept identity. No drift. Years stack.
Aggregated misconceptions
When three peers get a concept wrong the same way, the engine teaches the next student differently.
Empirical calibration
Question difficulty refits weekly to real cohort responses. Synthetic estimates retire as the cohort answers.
Onbridger your weakest link first
Daily Study Briefing
Open the app and know exactly what to study. Three priorities, ranked by urgency. Under a minute to read; the plan recalculates after every session you complete.
Mastery you've earned
Five tiers, no raw percentages. You progress through Building, Developing, Proficient, Strong, Mastered. Earned, not assigned.
Building
Developing
Proficient
Strong
Mastered
Each tier is earned, not assigned.
Personalized Spaced Review
Mistakes resurface at the exact moment your retention is about to drop. The system learns your forgetting curve and queues each topic across all your courses, oldest first.
Risk Alerts
If you're drifting off pace, you'll know early. The exam date is always a load-bearing input. No surprises the night before.
Built for retention
Chapter Coverage Map
A live heatmap of where you stand across the syllabus. Onbridger uses it to choose what to ask next, and walks you back to a foundation topic when an answer reveals a gap. Click any chapter, anywhere; the map is a view of your progress, not a wall.
Interleaved Practice
Once you've cleared a chapter, topics rotate every few questions. Mixing related concepts forces you to distinguish between them, which research consistently shows strengthens long-term retention.
When you fail, you see the passage that fills the gap
When a wrong answer points to a specific gap, you don't just get a corrected answer. You see the actual paragraph from your own textbook that explains the underlying idea, with the page number, before you try again. No more “go re-read chapter 4 and figure it out yourself.”
From your textbook · p.184
“The value-added approach avoids double-counting by including only the value each producer adds at their stage, not the total revenue, so intermediate goods aren't counted twice.”
In your professor's own words
Every question, every explanation, every remediation excerpt pulls from the lectures, notes, and past exams you uploaded. Not a generic tutor pretending to know your syllabus, the actual material your professor teaches from.
“If the central bank raises the policy rate by 50bps while inflation expectations remain anchored, what is the expected effect on...”
Teach to Learn
Every few questions, explain a concept as if teaching a classmate. Teaching forces you to organize what you know. Onbridger grades you on coverage, accuracy, coherence, and depth.
Mastery, not memorization
You can't pass a topic by guessing or by speed-clicking through. The system reads consistency, depth, and time-on-topic. Every concept must be covered before mastery advances.
Insights & control
Personal engine surface
See what's actually stuck.
Every session updates a personal model of what you know. Per topic, per concept. The forecast tells you when something is about to slip, before it does. Cohort signals appear alongside, gated when at least three peers contribute.
Insights
Macroeconomics · 24 topics
Real GDP vs Nominal GDP
Inflation Targeting
Phillips Curve
Fiscal Multipliers
IS-LM Model
Real GDP vs Nominal GDP
StrongTrend
Accelerating
Last seen
2d ago
Concepts
3 / 4
Retention forecast
Holds 8 days. Review queues automatically before recall slips.
Concepts covered
3 / 4Definition
Base-year calc
Deflator
Index comparison
Recurring confusion
Often confuses index vs deflator on application questions
Four tabs: Overview for the big picture, Topics for the per-concept drill-down, Calibration for confidence-vs-accuracy honesty, Activity for the engine's daily log.
Partial & Final Scoping
When your syllabus has midterms and a final, Onbridger detects them automatically. Briefing, reviews, and readiness scope to the active exam. No manual switching.
Partial 1
Mar 15
Active scopeFinal
Jun 5
Auto-activates after Mar 15
Mock Exam Mode
A timed, full-length simulation drawn from your past-exam uploads. Reserved questions you've never seen in regular sessions, scored under exam pressure.
Maintenance Mode
Once you've cleared the exam-practice phase, toggle Maintenance Mode. The agenda hides; spaced reviews still queue when due. Stop the noise without losing the safety net.
Ask Anything
Confused mid-session? Ask a clarification question grounded in your uploaded material. Onbridger answers, then turns substantive questions into a future review item so the gap gets tested later.
Share a Course
Studying with a classmate? Generate a share link. They preview the course material before signing in, then import a clean copy into their own account. Your mastery and study history never leave your account.
Surface details
Sources Sidebar
Every uploaded file is tracked. See how many questions came from each source, and remove a file cleanly. Its questions, reviews, and lesson cache go with it.
Code-Bearing Courses
Upload Jupyter notebooks, R scripts, or Python files alongside your slides. Onbridger reads the code, generates questions that ask you to write, debug, predict output, and explain it, and gives you an in-page editor with syntax highlighting.
Fatigue-Aware Sessions
Long sessions trigger a softer mode: break suggestions at round boundaries, gentler difficulty, softened mastery penalties. Marathon sessions don't hurt your progress.
Exam Readiness Band
Know where you stand without obsessing over a number. Five course-level bands (Getting Started, Developing, On Track, Strong, Exam Ready), honest about the worst topic, not just the average.
We commit to publishing how often we are right.
Onbridger predicts your grade before the exam, then records what you actually got. The delta is the only honest measure. Predictions improve as the cohort grows. The live record is on a public page.
See accuracy & methodologyCreated by students at Bocconi University and KTH Royal Institute of Technology
who wanted a smarter way to prepare for exams.