STEM
From algebra to robotics
Math, science, engineering, and coding in one orbit.
AlgebraGeometryCalculusPhysicsRobotics
The one app for every learner in your family.
Ages 3 to college. Math, reading, science, art, music, and 20 languages — all in one safe, ad-free subscription that adapts to each child.
No credit card required · Cancel anytime
Ages 3–7
Mathematics
Ages 8–10
Science
Ages 11–13
Reading
Ages 14–18
Coding
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323
Games
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20
Languages
COPPA CompliantFERPA CompliantChild SafeNo Ads EverNo TrackingTrusted by families worldwide
How does your family learn?
Koydo All-in-One
AI tutoring, 300+ games, art studio, music, and full K-12 curriculum in one app.
From Free→
Homeschool
Complete K-12 curriculum, gradebook, transcripts, and 50-state compliance.
From $20/mo→
Languages
20 languages with AI pronunciation grading and CEFR levels.
From $9/mo→
Test Prep
SAT, AP, and exam prep with adaptive AI coaching and score tracking.
From $9/mo→
Why families love and trust Koydo
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Subjects
From phonics to AP Calculus — one platform covers it all.
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Modules
Structured learning modules across every grade level and domain.
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Lessons
Measured lesson inventory from the live catalog, not a marketing estimate.
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Practice Types
Quizzes, flashcards, short answers, debate, coding, and more ways to learn.
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Lab Tracks
Hands-on science pathways keep experiments interactive instead of passive.
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Games
Play is how kids learn best — every game maps to standards.
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Activities
Distinct activity formats across practice, creation, and analysis.
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Languages
Full content and AI in every language — not just translated menus.
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Ads & Trackers
No ads, no tracking, no data sold. COPPA-compliant by design.
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Lessons served to date
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Try it right now
Explore what's inside Koydo — quiz, draw, trace, color, and more.
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Koydo Playground
Quiz Arena
Koydo Playground
Quick Picks
Everything your child needs to love learning
🎮
Games
323 games
Math, reading, science — disguised as play
Educational games that feel like real games. Each one is mapped to curriculum standards and adapts to your child's skill level.
- Covers math, reading, science, coding, and more
- Difficulty adjusts automatically as your child improves
- Progress tracked across every game session
Learn languages through music
Bilingual songs that teach real vocabulary. Pick a language to start.
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EN \u2194 KO
Warm Stairs Song
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Tap play to start learning
Listen and read along \u2014 vocabulary sticks through melody
8 languages · More coming soon · Vocabulary through melody
Subject families
Just some of what we teach
8,372 learning modules across 179 subjects, organized into clear families from early learning through graduate-level study.
Health
How bodies work and how we care for them
Body systems, wellness, care, and public health.
AnatomyNutritionNursingPublic Health
Humanities
Ideas, stories, and the shape of history
History, literature, and the ideas that shape culture.
World HistoryLiteraturePhilosophyCreative Writing
Business
Money skills with real-world context
Money, markets, entrepreneurship, and practical life skills.
EconomicsAccountingFinancial LiteracyEntrepreneurship
Languages
Conversation, grammar, and fluency practice
Reading, listening, and conversation across major languages.
SpanishFrenchMandarinArabicJapanese
Early Learning
The first building blocks
Foundations for young learners, built to feel approachable.
PhonicsCountingColors & ShapesSocial-Emotional Learning
Test Prep
Practice built for big milestones
Focused practice for SAT, AP, and high-stakes milestones.
SAT MathSAT ReadingAP CalculusAP Biology
...and 179 more subjects across STEM, health, humanities, business, languages, arts, and beyond.
New · 2026
Koydo Meridian™
One curriculum for every stage of study.
From first phonics through doctoral research — built on Koydo's own teaching and the best openly-licensed academic sources in the world.
104
gold concepts
peer-reviewed & cross-corroborated
14
domains
math → languages → arts
9
age bands
ages 2 through 100
111+
CC-licensed sources
MIT OCW · Open Yale · OpenStax · Khan · more
- ✓918 concepts spanning 10 major fields — the same classification used by UNESCO and world university rankings
- ✓7 learner stages — foundation, bridge, specialization, advanced, research, lifelong
- ✓6 core pillars every learner starts with — critical thinking, quantitative literacy, scientific literacy, history & culture, communication, sustainability & citizenship
- ✓10 cross-cutting real-world challenges — AI & society, climate, health, cities, democracy, markets, culture, food & agriculture, education, security
- ✓998 content items across 19 kinds (lesson, flashcard, MCQ, lab sim, Socratic dialog, song, story, project, and more)
- ✓135 graduate + 126 lifelong/certification concepts bridged from Koydo's own Medicine, Law, MBA, CS and Humanities tracks
- ✓118 sources registered · 7 actively ingesting
- ✓879 semantic embeddings — find the right concept in under a second
Built for trust
Every concept records its license, source, and revision history. Koydo's own teaching is labelled. External content is openly licensed.
Built for access
Public REST API + an MCP server so AI agents can query Meridian directly. Weekly bulk exports for researchers and partners (external sources only).
Koydo Cortex™ Adaptive Intelligence
Your child's brain is unique.
Cortex learns how it works.
Built on Bloom's 2-Sigma research — the proof that one-on-one tutoring moves students from the 50th to the 98th percentile — Cortex delivers that same advantage to every learner, at scale.
Koydo Cortex™ — Adaptive Intelligence
Real-time adaptive learning, guided by Cortex intelligence
46 Cortex behavioral signals
Hesitation time, tap rhythm, focus patterns, hint usage, time-of-day concentration — Koydo Cortex™ observes what worksheets and videos cannot.
7-band spectral learning model
Every concept flows through seven learning dimensions — from provocation to discovery, practice to mastery, spaced retrieval to long-term recall. Cortex orchestrates the sequence.
Adapts mid-lesson, not after
Difficulty, pacing, and content shift in real time. Every child gets a learning path shaped by their own mind — not a one-size-fits-all sequence.
Meridian — Global Curriculum Engine
Content aligned to your school, your language, your world
Meridian maps national frameworks across 195 countries so your child learns content aligned to your school, your language, and your world. Translation changes words — Meridian adapts mental models.
20Languages
195Countries mapped
179Subjects
Koydo Cortex™ Adaptive Intelligence
Koydo grows with your learner.
The interface adapts to each child's age — playful for little ones, confident for tweens, minimal for teens. Same powerful tools, different visual maturity.
Behind every visual is Koydo Cortex™ collecting 46 behavioral signals, orchestrating the learning path, and adjusting lesson difficulty, pacing, and content in real time.
Meet Your AI Study Companion
A friendly face that listens, encourages, and adapts to how you learn.
Voice interactions, emotional awareness, and adaptive encouragement — all in one friendly face that grows with your learner.
Start in 30 seconds
No complicated setup. No learning curve for parents.
1
✨Sign up free
30 seconds, no credit card.
2
🎯Pick an activity
Games, labs, music, or adaptive lessons.
3
📈Watch them learn
AI adapts. You see the progress.
One subscription that grows with your family
Family plan: 4 profiles at different ages. Each gets their own adaptive experience.
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Koydo Jr.
Ages 3–7
First letters, counting, colors, shapes, and phonics. Big buttons, warm voice, gentle pacing.
⭐
Koydo Kids
Ages 8–10
Multiplication, reading comprehension, science experiments, and creative coding. Achievement-oriented.
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Koydo Learn
Ages 11–13
Pre-algebra, essay writing, study skills, and deeper science. Productivity tools and peer collaboration.
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Koydo Academy
Ages 14–18
SAT prep, AP courses, college readiness, career exploration. Data-rich, minimal, earns respect.
Designed for kids. Trusted by parents.
Safety isn't a feature — it's the foundation everything is built on.
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100% Ad-Free
No ads, ever. Not in the free tier, not anywhere. Your child's attention is for learning, not advertisers.
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COPPA & FERPA Compliant
Full regulatory compliance for children's privacy. We follow the strictest standards in the industry.
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No Data Tracking
We don't track, profile, or sell children's data. Memory-based analytics only for users under 13.
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Expert-Curated Content
Every lesson and activity is reviewed by educators and child development specialists. No algorithm-generated content.
Simple, honest pricing
Start free. Upgrade when your family is ready.
Koydo Free Limited
Free
Start free- No credit card required
- Up to 10 free lessons each day
- Selected educational games
- 1 included language
- Ad-free, safe learning environment
Koydo Plus
$9/mo
- 8,372 learning modules across 179 subjects (Elementary-Graduate)
- AI Everyday Tutor included
- 323+ educational games
- 4 included languages with pronunciation grading
- Adaptive practice shaped by learner progress
- Offline lesson access
Best for Families
Koydo Family
$17/mo
- Everything in Plus
- Up to 4 learner profiles
- All 20 languages unlocked
- Parent dashboard & family insights
- Stronger parental controls & routines
- Best value — one plan for the whole family
Homeschool
Koydo Homeschool
$20/mo
- Everything in Plus
- Gradebook & report cards
- Lesson planner & curriculum builder
- State guidance & deadlines (50 states)
- Document vault & transcripts
- Attendance logging & co-op support
Homeschool
Koydo Homeschool Family
$30/mo
- Everything in Homeschool
- Up to 4 learner profiles
- All 20 languages
- Family gradebook & report cards
- Data export & portfolio
- Best value for homeschool families
What we're building
We keep building for the long run.
Families choosing Koydo today should feel that Koydo is being built for decades, not release cycles. The roadmap shows how we plan to compound the product with creators, partners, and communities around the world.