STEM
From algebra to robotics
Math, science, engineering, and coding in one orbit.
AlgebraGeometryCalculusPhysicsRobotics
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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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334
Games
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20
Languages
COPPA CompliantFERPA CompliantChild SafeNo Ads EverNo TrackingTrusted by families worldwide
How does your family learn?
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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Courses
Structured learning paths across every grade level.
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Lessons
Adaptive practice that adjusts to each child in real time.
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Questions
Spaced repetition keeps concepts fresh — research shows it works.
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Hrs of Content
Ebooks, audiobooks, video, and interactive modules.
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Music Tracks
Original educational music for every age group.
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Ebooks
Read-along stories and curriculum-aligned texts.
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Audiobook Hrs
Listen and learn on the go.
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Games
Play is how kids learn best — every game maps to standards.
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Activities
Quiz, trace, draw, build, code, and more.
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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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Everything your child needs to love learning
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Games
334 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
Subject families
Just some of what we teach
1.2M learning modules across 3,456 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 3,456 more subjects across STEM, health, humanities, business, languages, arts, and beyond.
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
3,456Subjects
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.
Start in 30 seconds
No complicated setup. No learning curve for parents.
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✨Sign up free
30 seconds, no credit card.
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🎯Pick an activity
Games, labs, music, or adaptive lessons.
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📈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.
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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
- 1.2M learning modules across 3,456 subjects (Elementary–Graduate)
- AI Everyday Tutor included
- 334+ 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
Phased roadmap
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.
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
Frequently Asked Questions
- Yes. Koydo Free gives you up to 10 lessons per day, 334 educational games, and learning in 20 languages — no credit card required. Paid plans ($9/mo Plus, $17/mo Family) unlock unlimited lessons, AI Tutor, and family profiles.
- Koydo covers ages 3 through adult. Koydo Jr. (3-7), Koydo Kids (8-10), Koydo Learn (11-13), and Koydo Academy (14-18) each have age-appropriate content, voice, and interface design. College and professional courses are also available.
- Koydo Cortex reads 46 behavioral signals in real time — including hesitation time, tap rhythm, hint usage, and time-of-day focus patterns. It adjusts question difficulty, content pacing, and learning path mid-lesson, not after. Every child gets a different experience because every child learns differently.
- Yes. Koydo is COPPA and FERPA compliant. There are zero ads, zero behavioral tracking for children under 13, and zero data sale. All AI interactions are moderated with a fail-closed content safety system, and parental consent is required before any child data is collected.
- Koydo has 1,200,000 learning modules and 3,700,000 individual lessons across 60+ subjects — from Pre-K phonics to college calculus, music theory to CDL license prep.
- Yes. Koydo includes a complete homeschool suite with gradebook, state-aligned report cards, portfolio transcripts, curriculum planner, co-op management, attendance tracking, and compliance documentation for all US states.
- Yes. The mobile app supports offline access after initial content download. Your progress syncs when you reconnect.
- Koydo supports 20 languages: English, Spanish, French, German, Arabic, Hindi, Chinese, Japanese, Korean, Russian, Polish, Portuguese, Italian, Turkish, Vietnamese, Thai, Indonesian, Ukrainian, Bengali, and Urdu. Each includes AI pronunciation grading.
Is Koydo really free?
What ages does Koydo cover?
How does Koydo Cortex adaptive learning work?
Is Koydo safe for children?
How many subjects and lessons does Koydo have?
Can I use Koydo for homeschooling?
Does Koydo work offline?
What languages does Koydo support?
Start your family's learning journey today.
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