Free version · Open source · MIT

showhow

Explainer reels drawn in code. Every move lands on a spoken word, and every render is checked before it ships. Turn the sound on.

Get the code → Join tein →

Full examples

Complete reels, made with the same engine and checks, with voice and music.

How a wing really makes lift

airplanes · 65 s

The myth, the Cambridge smoke test, pressure, speed and flaps. A Boeing 737 drawn in code, every part on its word.

What if the Earth were flat?

world · 58 s

On a disc built from Earth's own rock, gravity pulls toward the pole: balls roll, oceans pool, and the walk to the edge is all uphill.

The demos in the repo

Each one ships with its voice and timing, and renders with no key.

demo

8 s

A block falls under real gravity, lands on its word, and the camera circles it.

pendulum

12 s

Big and small swings keep the same time. A string a quarter as long swings twice as fast.

gears

14 s

10 teeth turn 30 a third of a turn, the other way, with three times the force.