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AI-Powered Learning

TSUNAGI

つなぎ — The Art of Connection

Transform any link into a full learning experience. Summaries, flashcards, roadmaps, and quizzes — generated in seconds by AI.

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See What Tsunagi Creates

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Example Output
Introduction to Neural Networks
AIdeep-learningmath
Neural networks are computational models inspired by the human brain. They consist of layers of interconnected nodes (neurons) that process information and learn patterns from data through a process called training.
Flashcard 1 of 5
What is backpropagation?
An algorithm that computes gradients backward through the network to update weights and minimize the loss function during training.
Roadmap
01Linear algebra & calculus basics
02Perceptrons and activation functions
03Backpropagation & gradient descent
04Build a simple classifier with PyTorch
05Deploy your first model to production
Example Output
Mastering React Hooks
javascriptreactfrontend
React Hooks let you use state and lifecycle features in functional components. Introduced in React 16.8, they eliminate the need for class components and make logic reuse clean and composable.
Flashcard 1 of 5
When should you use useCallback?
Use useCallback to memoize a function so it keeps the same reference between renders — preventing unnecessary re-renders of child components that receive it as a prop.
Roadmap
01useState and basic state management
02useEffect and the dependency array
03useRef, useCallback, useMemo
04Custom hooks — build your own
05Context API + advanced patterns
Example Output
Climate Change & Global Policy
sciencepolicyenvironment
Climate change refers to long-term shifts in global temperatures and weather patterns. Since the Industrial Revolution, human activities — primarily burning fossil fuels — have been the main driver of accelerating climate change and rising CO₂ levels.
Flashcard 1 of 5
What is the Paris Agreement's main goal?
To limit global warming to well below 2°C above pre-industrial levels, and pursue efforts to limit the increase to 1.5°C, by reducing greenhouse gas emissions worldwide.
Roadmap
01The greenhouse effect explained
02Key data — CO₂ levels and temperature trends
03International agreements and frameworks
04Renewable energy transition strategies
05Individual and policy-level action plans

The Team

builders behind tsunagi
RH
Ren Hayashi
林 蓮
Founder & CEO
Former researcher at Tokyo University. Obsessed with the intersection of language, memory, and machine intelligence.
AM
Aoi Mizushima
水島 葵
CTO & Lead Engineer
Full-stack engineer with a background in NLP. Built AI pipelines at scale across two previous startups.
KS
Kaito Sakamoto
坂本 海斗
Head of Design
Trained in Kyoto. Brings Japanese design philosophy — ma (間), wabi-sabi — to every pixel of Tsunagi.
YN
Yuki Nakamura
中村 雪
AI Research Lead
PhD in cognitive science. Designed Tsunagi's spaced repetition and knowledge extraction architecture.
HT
Hana Takeda
武田 花
Community & Growth
Community builder and educator. Runs Tsunagi's learner network and manages partnerships with universities.
SI
Sora Ishikawa
石川 空
Product Manager
Ships fast. Previously PM at a leading EdTech platform in Tokyo. Believes great products feel inevitable.
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About Tsunagi

Tsunagi (つなぎ) means "connection" in Japanese. We connect scattered knowledge from the web into structured learning paths — giving you the understanding, not just the information.

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How to Use

1

Paste 1–5 links or topic keywords into the input

2

Click Generate — AI creates a summary, flashcards, and roadmap

3

Study with interactive Learning Mode or test yourself in Quiz Mode

4

Save sessions to your personal Feed for later review

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Vision & Whitepaper

Tsunagi builds a learning layer on top of the internet. We believe every piece of content should be learnable — not just readable. Our AI analyzes structure, extracts key knowledge, and creates personalized study paths adapted to spaced repetition principles.

The more you learn, the smarter your feed becomes.

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Why It Works

The Ebbinghaus forgetting curve shows we forget 70% of new information within 24 hours. Tsunagi combats this with structured recall — converting passive reading into active learning with flashcards and quiz challenges built directly from your sources.

Learning Mode

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