Do girls use the word "pal" to each other? Or is it usually used among boys?

No one uses it anymore. Try “dude” instead. Some people use dude regardless of gender, some don’t.

It's quickly falling out of favor, but is still sometimes used in a sarcastic manner. On the other hand, you will sometimes hear the term "gal pals."

I don’t use it and I’ve personally never heard other women use it. Never really heard men use it either. I think it’s used on TV and in movies far more than in real life.

It's an old fashioned word. I'm not sure even boys would use it anymore? It just makes me think of Mickey Mouse calling his dog Pluto "Pal."

I don’t really think I ever use it with my female friends or have it used with me. Honestly to me (mid 20s, white, female, General American speaker) it sounds kinda weird and old fashioned. I can only really imagine one man using it to another when he’s trying to be condescending and confrontational

I mean, there's a website called PayPal which uses the same name format.

I would never use the word “pal” with anyone. If I were to use it, it would be me calling a beloved pet or a little boy “pal,” although I personally would use the word “buddy” for that, instead. It would be very unusual and frankly odd for a woman to call a woman “pal.”

I wouldn’t use it in actual conversation to refer to a person, as it’s a bit outdated, but for your plans of naming an app it sounds good. I would use an app called BakePal without hesitation. It sounds friendly and approachable.

"Pal" is uncommon if you're being sincere, though on its own it's neutral. Depending on context, you'd probably just want "friend", even in more casual contexts.

It usually sounds more masculine, but it also wouldn't sound too weird if it were used for a girl. I think "BakePal" is a very cute name. It makes me picture a little robot friend who helps you with baking. 🙂

Nobody really says pal anymore unless it’s in a sarcastic degrading manner to make a person seem less than, like in a verbal confrontation, for example, “What are you gonna do about it pal?” Here it is used to belittle the person, like calling someone “little guy.” Personally I’ve never heard someone say “gal pal” in my life. Although, I like it in the context of the app name. The use of “pal” in this context makes it sound like it’s a baking companion app. For example, if there was an app named TaxPal, I would presume it’s a tax companion to help you complete your taxes. So while pal may usually hold a negative connotation in conversation, in this context it does indeed come across as friendly.

You are getting US English-centric answers because most Brits are asleep. In British English "pal" is a common word but is generally used by Northeners more often than people from the South. It is generally gendered - used by men to refer to their male friends.

In Scotland, some women would, more likely working class women I'd say. In England, some women will say “mate” to each other -  I would say that is less class associated, but not actively posh. In Scotland, generally, and among men, “pal” is very common and used a lot more than “mate”. But sarcastic or aggressive usage of “pal” among men is probably more common than similar usage of “mate” in England, although that certainly does go on as well. 

Regardless of whether people really use the word pal I still think it's fine for your app name for the very fact that PayPal exists and is very popular.

Used a lot in Scotland by working-class people as a generic term of address to a stranger.

I would call the app “BakingBuddy” or something similar. “Pal” is seen by most English speakers as something an old person would say, and is not widely used by the majority of speakers.

"pal" is a bit old fashioned. It's not in common usage among younger people. And mostly men use it. I have never heard a girl use this to refer to one of her girl friends. With all that said BakePal is not a bad name for an app and can be gender neutral as the "pal" is the name of the app.

"Pal" is a normal casual way to refer to friends in Scotland for any gender - e.g. "I went to the park with my pals at the weekend", "My pal's house is huge" etc

I think 'pal' is good in an app name, even though people don't use it much anymore in daily conversation. It has good connotations that will help people understand what the app is.

By calling the app BakePal, it sounds more like the app itself is your “baking buddy/pal” rather than the app calling you pal. But, I think it works perfectly for an app!

No one really says Pal anymore although it's gender neutral.

Will depend on region, yes here in Scotland.

Just in the UK. In America they use "NTSC". Sorry, bad joke.

Bakepal sounds like an amazing name for a baking app it fits great even though people don’t use it in actual speech much anymore names get a lot of leeway and bakepal sounds super natural for an app name.

Overall I’d say pal isn’t particularly common, but if it’s used it’s more likely referring to men, with the exception of gal pal as you mentioned. Alternatives (in the US) - men might refer their “buddy” or their “boys” to talk about male friends. Women usually just say friend (though I guess straight women say “girlfriend” too). In the UK I think mates is gender neutral, but Brits feel free to correct me. 

If I had to guess, probably not. Not a girl, though, so I wouldn't know.

You will get dozens of contradictory answers, because English is spoken widely around the world, in all kinds of dialects. I'm sure some girls call their friends "pal", and I'm sure lots don't. A lot of men avoid using the word "pal" in England, because it's so often used in an aggressive way, leading up to a fight. But others use it all the time. You'll never get a simple and direct answer about any colloquial word, because it simply varies *enormously.*

I've never personally used either pal or gal pal, and I've never heard either one among other women I know, either. Most girls I know of would probably call each other girlfriend, bestie, or dude. If you're talking to someone else about your friend, you would usually just refer to them as your friend, or best friend if you're super close.

“Penpal”, maybe. Used unironically, or not for humorous effect, “pal” is used mostly by older people. “Gal pal”, maybe, in a tabloid newspaper. I don’t think you’re going to hear it from any actual kids.

The word "pal" can refer to men or women, and sometimes the phrase "gal pal" is used, however the word is falling out of favor. In the US you aren't likely to hear someone under 50 use it, and it was mostly popular with their parents. Native speakers know the word because it is still in use and you find it in popular media (particularly older media), but it's much less frequently used today.

I'd say mostly males use it but I frequently see it used in a condescending way rather than positively

BakePal is a sensible name. People don't really use the word pal in casual conversation anymore, but product names are a good example of where it's still used (e.g. MyFitnessPal, PayPal). It's also not a super gendered word.