# HAT vs pHAT vs wHAT

**URL:** <https://forums.pimoroni.com/t/hat-vs-phat-vs-what/26579>\
**Category:** Raspberry Pi\
**Created:** [November 18, 2024, 7:00pm UTC](https://forums.pimoroni.com/t/hat-vs-phat-vs-what/26579 "2024-11-18T19:00:49Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Kiwi](https://avatars.discourse-cdn.com/v4/letter/k/e5b9ba/32.png) [@Kiwi](https://forums.pimoroni.com/u/Kiwi)\
**Post date:** [November 18, 2024, 7:00pm UTC](https://forums.pimoroni.com/t/hat-vs-phat-vs-what/26579/1 "2024-11-18T19:00:49Z")

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I know what a HAT is but what is a wHAT or a pHAT. Is it something to do with size?

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**Author:** ![Shoe](https://avatars.discourse-cdn.com/v4/letter/s/e36b37/32.png) [@Shoe](https://forums.pimoroni.com/u/Shoe)\
**Post date:** [November 18, 2024, 8:15pm UTC](https://forums.pimoroni.com/t/hat-vs-phat-vs-what/26579/2 "2024-11-18T20:15:19Z")

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So the HAT specification is written by the Raspberry Pi team, and you have to do certain things to call your product a HAT (officially, anyway).

There’s no official specification for a Pi Zero-sized addon, so Pimoroni created their own pHAT term (might be partial hats?), whereas Adafruit uses terms like Bonnets for add-ons which are that size.

wHAT I think is just “wide-HAT”, a Pimoroni thing.

So pHAT and wHAT are unofficial terms for differently sized addons the Pi company hasn’t created anything official for.

EDIT: It looks like the newer HAT+ specification is less choosy about HAT size, so technically something Pi Zero-sized could officially be a HAT+ if it complied with the other requirements.

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**Author:** ![Kiwi](https://avatars.discourse-cdn.com/v4/letter/k/e5b9ba/32.png) [@Kiwi](https://forums.pimoroni.com/u/Kiwi)\
**Post date:** [November 27, 2024, 1:19am UTC](https://forums.pimoroni.com/t/hat-vs-phat-vs-what/26579/3 "2024-11-27T01:19:42Z")

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> [@Shoe](#):
>
> EDIT: It looks like the newer HAT+ specification is less choosy about HAT size, so technically something Pi Zero-sized could officially be a HAT+ if it complied with the other requirements.

I see some stuff on the Pimoroni store that is Pi 5 size and called “HAT+”, but some stuff, like the [Clipper HAT **Mini**](https://shop.pimoroni.com/products/clipper-hat-mini?variant=53509959876987) is called “Mini”. It’a pHAT sized, but it’s called “mini”?

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**Author:** ![hel](https://sea2.discourse-cdn.com/flex016/user_avatar/forums.pimoroni.com/hel/32/6075_2.png) [@hel](https://forums.pimoroni.com/u/hel)\
**Post date:** [November 27, 2024, 8:52am UTC](https://forums.pimoroni.com/t/hat-vs-phat-vs-what/26579/4 "2024-11-27T08:52:52Z")

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mini HATs and pHATs are the same size - we switched to ‘mini HAT’ for recent products as it’s a bit more descriptive :)