Is Bartosz Ciechanowski free?

Yes. Bartosz Ciechanowski is free and does not ask you to register or hand over an email address before you can use it.

How long does Bartosz Ciechanowski take?

Clear your evening. We warned you. We file it under "Rabbit hole" — the best interactive explainers anyone is making.

Does Bartosz Ciechanowski work on a phone?

Bartosz Ciechanowski really wants a mouse and a wide window. It will load on a phone, but the experience is built for desktop.

Explain Everything

Bartosz Ciechanowski

The best interactive explainers anyone is making

Visit ciechanow.ski More Explain Everything

ciechanow.ski

Rabbit hole · Best on desktop

Free, no sign-up · online since 2017

What Bartosz Ciechanowski actually is

Long articles on how a single physical thing works, covering GPS, gears, cameras, internal combustion, sound and the Moon's orbit. Each is built around dozens of custom diagrams you drag, spin and scrub through. Nothing here is a video; every figure is a live model responding to your input.

Why it is worth your time

The diagrams are constructed so that the second you drag the slider yourself, the equation stops being notation and becomes something you have watched happen.

Common questions

Is Bartosz Ciechanowski free?: Yes. Bartosz Ciechanowski is free and does not ask you to register or hand over an email address before you can use it.
How long does Bartosz Ciechanowski take?: Clear your evening. We warned you. We file it under "Rabbit hole" — the best interactive explainers anyone is making.
Does Bartosz Ciechanowski work on a phone?: Bartosz Ciechanowski really wants a mouse and a wide window. It will load on a phone, but the experience is built for desktop.
What kind of site is Bartosz Ciechanowski?: We list it under Explain Everything — hard things, made suddenly obvious. The diagrams are constructed so that the second you drag the slider yourself, the equation stops being notation and becomes something you have watched happen.

Keep going

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Explain Everything

Bartosz Ciechanowski

The best interactive explainers anyone is making

Visit ciechanow.ski More Explain Everything

ciechanow.ski

Rabbit hole · Best on desktop

Free, no sign-up · online since 2017

What Bartosz Ciechanowski actually is

Why it is worth your time

The diagrams are constructed so that the second you drag the slider yourself, the equation stops being notation and becomes something you have watched happen.

Common questions

Is Bartosz Ciechanowski free?: Yes. Bartosz Ciechanowski is free and does not ask you to register or hand over an email address before you can use it.
How long does Bartosz Ciechanowski take?: Clear your evening. We warned you. We file it under "Rabbit hole" — the best interactive explainers anyone is making.
Does Bartosz Ciechanowski work on a phone?: Bartosz Ciechanowski really wants a mouse and a wide window. It will load on a phone, but the experience is built for desktop.
What kind of site is Bartosz Ciechanowski?: We list it under Explain Everything — hard things, made suddenly obvious. The diagrams are constructed so that the second you drag the slider yourself, the equation stops being notation and becomes something you have watched happen.