Foundations
Learning to Think
Build foundations of reasoning: notice patterns, ask questions, compare ideas, and explain choices.
Future learning direction
Reasoning & Judgment Training Platform
Build judgment
in the age of answers.
ZigZagUp is developing a reasoning and judgment training platform that looks beyond answers to how learners think. Choices, confidence, and explanations help identify gaps in knowledge and reasoning and guide targeted learning and practice. The aim is to help learners think critically, apply what they know, and make informed decisions on their own.
A More Capable Future
- Intuition
- Knowledge
- Critical Thinking
- Judgment
Our platform vision
One Platform. Three Pathways. One Goal.
Stronger Reasoning. Better Judgment.
ZigZagUpReasoning & Judgment Training Platform
Shared IKCJ foundation
IntuitionKnowledgeCritical ThinkingJudgment
Academic Opportunity
Learning to Master
Deepen subject understanding and apply knowledge in coursework, assessments, and unfamiliar situations.
KuEraFirst product · In development
Independent Life
Learning to Decide
Make real-world decisions when priorities compete, information is incomplete, and choices have consequences.
Personal FinanceFirst product · In development
Our first products · In development
Two products.
One shared approach.
Independent Life
Personal Finance
Judgment for real financial decisions.
What it develops
Financial understanding and judgment: weighing goals, constraints, risks, and consequences. Financial knowledge meets real-life decisions.
How learning works
Start with a topic
Learning Library
13 planned chapters covering California’s high-school personal finance topics.
Start with a goal
Life Lab
Connected missions put financial concepts to work through goals, changing circumstances, and decisions with consequences.
Start in either. Move between both.
Product video coming soon
Where learning applies
Three missions. Real-life decisions.
- Achieve financial stability.
- Reach a goal by a deadline.
- Build your financial future.
Apply financial concepts as goals, constraints, and circumstances change.
Academic Opportunity
KuEra
Find your words. Own your thinking.
What it develops
Language understanding and reasoning: interpreting meaning, examining evidence, and explaining ideas. Vocabulary, comprehension, inference, and reasoning work together.
How learning works
Start with your own understandingChoice · Confidence · Explanation
Words & Thought
One connected learning experience.
WordsMeaning · Context
Nuance · Relationships
Nuance · Relationships
ThoughtComprehension · Inference
Evidence · Interpretation
Evidence · Interpretation
Identify gapsTargeted learning & practice
Demonstrate independent understandingApply learning to a new challenge without assistance.
How KuEra responds to the learner
Choices, confidence, and explanations help distinguish unfamiliar language from gaps in comprehension or reasoning.
Support is designed around that gap. A new challenge then examines understanding without hints or assistance.
Where learning applies
One learning engine.
Multiple test formats.
KuEra is designed to develop language understanding that extends beyond any single test. Planned preparation for SAT, ISEE, and other assessments will build on that foundation with test-specific content, question formats, and practice.
Planned language-focused applications include SAT Reading and Writing and ISEE Verbal Reasoning and Reading Comprehension.
How ZigZagUp trains reasoning
See the Reasoning. Find the Gap. Train for Judgment.
An answer alone cannot show how a learner reached it.
IKCJ: from a first idea to a decision the learner can explain.
Intuition
What do I think?
Begin with an independent choice, confidence rating, and explanation to reveal the learner’s starting point.
Knowledge
What am I missing?
Identify missing concepts and misconceptions, then build understanding through targeted instruction, examples, and practice.
Critical Thinking
What supports my conclusion?
Examine evidence, compare alternatives, and test assumptions through questions and practice that address reasoning gaps.
Judgment
Can I decide independently?
Apply learning to a new situation, explain the decision, and assess confidence—without hints.
Revisit and calibrate: Later challenges check what learners retain, what they can apply, and how closely confidence matches performance.
In development. Learning effectiveness has not yet been validated.
From the founder
Why I’m Building ZigZagUp
I am building ZigZagUp because I believe technology should expand our capacity to think, not replace the practice of thinking.
The next frontier of AI isn't just what machines can do. It's what humans can become.
Inna Arbo · Founder & CEO
Read the founder’s letter
As AI becomes increasingly capable of generating answers, our ability to question, reason, and exercise judgment matters more than ever.
When computers transformed how we process information, humanity adapted. Now AI is reshaping how we learn, think, and make decisions. This transformation presents an extraordinary opportunity—not just to make technology more intelligent, but to strengthen human intelligence alongside it.
I am building ZigZagUp because I believe technology should expand our capacity to think, not replace the practice of thinking.
Intuition has an essential place in that vision. It gives us a starting point: an idea, an instinct, a question. But intuition alone is not enough. By bringing together intuition, knowledge, and critical thinking, we can develop judgment that is thoughtful, informed, and our own.
We are developing a reasoning and judgment training platform designed to work across different learning contexts. Our first two product concepts—Personal Finance and KuEra—apply the same framework to real-world financial decisions and language understanding. In both, the aim is to make learners’ reasoning visible, provide support that responds to their needs, and return the thinking and decision-making to the learner.
My ambition reaches beyond any one subject. I want to use technology to help people better understand how they think, strengthen their reasoning and judgment, and unlock the full potential of human intelligence.
The next frontier of AI isn't just what machines can do. It's what humans can become.
Our opportunity is not simply to keep pace with increasingly intelligent machines, but to become more capable human thinkers—architects of our own reasoning and judgment.
Inna ArboFounder & CEO, ZigZagUp, Inc.
Built with educators
Help shape
what comes next.
Help shape our first learning experiences, explore collaboration, or discuss the platform’s next stage.
ZigZagUp is in development.
A conversation with the founder
Inna ArboFounder & CEO, ZigZagUpSan Francisco Bay Areainna@zigzagup.appInna brings more than 15 years of leadership experience at Visa. In 2025, she led a team recognized among the Top 10 in Visa’s Global GenAI Hackathon, with over 6,200 participants.