Simple pricing
All courses, all lessons, one price. Cancel anytime.
Monthly
$12/month
Billed monthly.
Yearly
$99/year
Save $45/year (31%) vs monthly.
Lifetime
$299 one-time
No subscription needed. Includes downloadable PDFs for every course.
Everything is included
- All 15 courses, 36,000+ lessons
- AI-tutored micro-lessons (~300 words each)
- On-demand examples and quizzes
- Progress tracking across every course
- Ask AI Tutor to explain any lesson
- Cancel anytime
What's in the catalog
15 courses · 36,441 lessons · 58,053 pages of downloadable PDFs (Lifetime).
| Course | Sections | Lessons | PDF pages |
|---|---|---|---|
| Mathematics | 24 | 3,121 | 4,472 |
| Computer Science | 23 | 2,872 | 4,298 |
| Web Development | 18 | 2,892 | 4,632 |
| JavaScript | 22 | 2,723 | 4,215 |
| Python | 24 | 1,289 | 2,096 |
| TypeScript | 23 | 1,796 | 3,029 |
| React | 25 | 2,396 | 3,732 |
| Java | 23 | 2,870 | 4,394 |
| Software Engineering | 31 | 1,933 | 3,052 |
| Data Science | 26 | 2,145 | 3,276 |
| Cloud and Infrastructure | 20 | 2,989 | 4,790 |
| Security | 21 | 3,052 | 5,033 |
| System Design | 26 | 1,919 | 3,049 |
| Machine Learning and Deep Learning | 23 | 3,538 | 5,445 |
| AI Engineering | 24 | 1,886 | 3,040 |
Frequently asked questions
Are these video courses?+
No. Every lesson is text-based and designed to be read in a few minutes (~300 words each). There are no videos to watch — just focused, skimmable explanations you can move through at your own pace.
Who writes the lessons?+
Lessons are AI-generated on demand using carefully tuned prompts and curated course outlines, then rendered as bite-sized text chapters. This lets us cover 36,000+ lessons across 15 in-depth courses while keeping a consistent voice and structure.
How does the AI Tutor work?+
Inside any lesson you can ask the AI Tutor follow-up questions, request another example, or get a concept re-explained in simpler terms. It uses the lesson context so answers stay on-topic.
What's the difference between Monthly, Yearly and Lifetime?+
Monthly and Yearly are subscriptions with full access to every course and the AI Tutor — Yearly saves ~31%. Lifetime is a one-time payment that includes everything plus downloadable PDFs for every course.
Can I try before I subscribe?+
Yes. The first 10 lessons of every course are free, no credit card required. You can browse the full catalog and sample any course before deciding.
Can I preview a course's curriculum before subscribing?+
Yes. Open any course from the Courses page to see its full curriculum — every lesson title, grouped by phase and section — before you commit. The first 10 lessons of each course are also unlocked for free so you can read the actual content, not just titles.
Is there a glossary of key terms for each course?+
Yes. Every course has its own glossary of key terms, each linked to the lesson that introduces it. You can browse all course glossaries from the Glossary link in the footer (or visit /glossary), or open a specific course and click 'Glossary' to see just that course's terms.
Can I cancel anytime?+
Yes. Monthly and Yearly plans can be cancelled from your account at any time and you'll keep access until the end of the current billing period.
Do I get a refund if I cancel?+
Monthly plans aren't refunded, but you keep access through the end of the paid period. Yearly plans are refundable within 7 days if you've used fewer than 20 paid lessons. Lifetime purchases are refundable within 14 days if you've used fewer than 50 paid lessons and haven't downloaded any course PDFs. Email us via the contact page to request a refund.
Want to try before you buy? The first 10 lessons of every course are free — browse courses.