Measurable typing improvement in minutes a day.
A minimal, ad-free typing test with detailed accuracy and consistency stats. Going from 45 to 90 words per minute compounds across every hour you spend at a keyboard.
Thousands of hours of coding lessons and certifications.
Interactive course · BSD / open
The best introduction to computer science, free to audit.
Video course · Creative Commons
Maths, science and economics from basics to advanced.
Course platform · Free tier — no card required
Real MIT course materials, openly published.
Course materials · Creative Commons
How valid tests are actually built and validated.
Open textbook · Creative Commons
Free courses, frequency lists and spaced repetition.
App + decks · AGPL / open source
High-resolution photography, free for commercial use.
JPEG downloads · Unsplash License
Free photos plus 4K stock footage in one library.
JPEG + MP4 · Pexels License
1,400+ consistent open-source SVG icons.
SVG + npm package · ISC / open source
