Learn to code.
Read the charts.
Pass your CDL.
50 interactive coding lessons with a live in-browser editor, chart-reading & risk-management practice, and a full CDL prep bank with instant feedback. Free to start, no account required.
Or start speaking fluent charts →Live demo — this is the same sandbox that runs code in every lesson.
8
of 15 subjects live
130+
CDL questions
50
Coding lessons
$0
To start
Pick a subject
What do you want to learn?
8 subjects are live right now. More are in development for 2026 — previewed below.
Coding
Python, JavaScript, C++, Java
12 modules · 50 lessons
Trading & Charts
Chart reading, candlesticks, risk management
44+ practice questions
Mathematics
Algebra through calculus and statistics
44+ practice questions
Science
Physics, chemistry, biology
46+ practice questions
Chess
Openings, tactics, strategy
40+ practice questions
CDL Test Prep
General knowledge, air brakes, hazmat, pre-trip
131+ practice questions
AI Tools
Claude, ChatGPT, Grok — hands-on guides
46+ practice questions
Web Development
HTML, CSS, JavaScript — build real websites
50+ practice questions
Coming soon
In development for 2026. No lessons yet — each card previews the planned topics.
Artificial Intelligence
Coming 2026Machine learning, neural nets, prompt engineering
See what's planned
History
Coming 2026Ancient civilizations to the modern era
See what's planned
English
Coming 2026Grammar, vocabulary, writing
See what's planned
Spanish
Coming 2026Vocabulary, grammar, conversation
See what's planned
Thai
Coming 2026Alphabet, tones, phrases
See what's planned
Russian
Coming 2026Cyrillic alphabet, grammar, conversation
See what's planned
Chinese (Mandarin)
Coming 2026Pinyin, characters, tones, conversation
See what's planned
How it works
Three steps. That's it.
Every subject follows the same simple format.
Pick your subject
Coding, CDL test prep, AI tools, chess, math, languages — choose what matters to you.
Learn by doing
Run code in your browser, take practice tests with instant feedback, play study games.
Track and repeat
See progress, build streaks, and review what you missed. Detailed explanations every time.
Coding
Our flagship subject. 12 modules across four languages, from printing “Hello World” to designing scalable systems.
- Write and run code in your browser — no installs
- Build up to hash tables, BFS & binary search (Modules 4–5)
- Finish with caching, load balancing & queues (Module 11)
Real screenshot — Module 1, Lesson 2. Every lesson ships this editor: 12 modules · 50 lessons · 4 languages.
CDL Prep
Pass your Commercial Driver's License exam on the first try. Real practice questions with detailed explanations and visual study guides.
- 130+ practice questions across 6 categories
- Instant feedback with detailed explanations
- Visual diagrams: inspection, air brakes, hazmat
Try 3 real questions
CDL sample test
The total stopping distance is made up of:
Straight from the 130-question bank. The full test tracks your score per category with an 80% pass threshold — same as the real exam.
Blog
All posts →Explore more
CDL Test Prep
New130+ real practice questions with sign images — air brakes, hazmat, pre-trip
Study Games
Play nowSpeed typing, flashcards, memory match, and code puzzles
Quizzes
InteractiveTest your Python, JavaScript, and AI knowledge with instant feedback
All Courses
8 liveBrowse every subject — coding, AI, math, CDL, languages, and more
Coding Curriculum
12 modulesFrom fundamentals to system design across 4 languages
Learning Blog
22 articlesGuides on Claude, ChatGPT, Grok, coding, CDL, and study tips
Start right now.
No sign-up. No credit card. No installs. Just pick what you want to learn and go.