The cat flap does not have a single confirmed inventor, but it is widely (and probably mythically) attributed to Sir Isaac Newton , while historical evidence shows cat doors existed centuries before him.

Quick Scoop

  • The popular story is that Isaac Newton cut holes in his door so his cat and her kittens could come and go without disturbing his light experiments.
  • Historians classify this as folklore: the anecdote appears in sources written long after Newton’s death and is considered “unlikely,” even if the door at Cambridge really did have plugged cat-sized holes.
  • Cat doors and cat holes are much older; records show purpose‑made cat openings in buildings (like Exeter Cathedral in England) from at least the late 16th century, and simple “cat holes” in doors in Europe from the 14th–16th centuries.

So who really invented it?

  • No named individual is credited with the original “cat door”; it evolved as a practical solution in barns, granaries, churches, and homes to let cats in for rodent control.
  • The modern idea of a flap covering the hole is often folded into the Newton legend (cloth over the opening), but again this is anecdotal rather than documented invention.

Myth vs. history (at a glance)

Aspect Isaac Newton story Historical evidence
Role Alleged inventor of the cat flap for his lab cat(s). One of many later users of a long‑existing idea, if the story is true at all.
Evidence timing Written accounts appear decades to ~70+ years after his death. Documented cat holes in doors from the 1500s and physical examples still visible in old European buildings.
Certainty Generally treated as a charming myth or anecdote. Archival records and surviving doors show cat doors pre‑date Newton.
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“Latest news” and forum chatter

  • Modern explainers and science/history sites now emphasize that the cat flap is “surprisingly ancient” and not really Newton’s invention, even while repeating the story as fun trivia.
  • Forum and social posts still love the Newton tale, usually phrased as “legend says” or “allegedly Isaac Newton invented the cat flap,” reflecting how sticky the myth is in online discussion.

TL;DR: If someone asks “who invented the cat flap,” the safest answer is: No one knows for sure; cat doors are centuries old, but legend credits Isaac Newton even though historians doubt he truly invented it.

Information gathered from public forums or data available on the internet and portrayed here.