Nothing. None of the experts who reviewed it raised a problem.
What the gurus are saying
This brush applies foundation seamlessly without streaking, and its soft, dense fibers let you use a light hand so you won't disturb sunscreen or other products underneath. Gurus praise how evenly it lays down coverage compared to beauty sponges, and note it works especially well for mature skin. The tapered, domed shape and stippling motion mean even application without the aggressive buffing that can shift your skincare.
Synthesized from 5 expert reviews · most recent take June 2026
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"Brush wise this is the BK Beauty 101, it's like their foundation brush. The brushes you use to apply your makeup really do make a difference and I'm obsessed with these brushes. I like it because you don't have to put a lot of pressure on the skin to get a really even, flawless application. So one, dummy proof, but two, you don't have to worry about like breaking up your sunscreen or your other skincare that's sitting underneath your makeup."
"This amazing perfect foundation brush is from BK Beauty, it's the 101. Look how flawless my face looks already, so good. As a pro makeup artist, my number one tip is always light layers because that equals longevity. A lot of people go in with way too much makeup from the get-go, right, and it's like oh it's not lasting on my skin, it's like because nothing can grip to your skin."
"I'm going to set it [...] with my 101 Brush by BK Beauty just by tapping it in. I just find setting it in just makes it look slightly less glowy and gives it more of a natural look."
"One of my all-time favorite BK Beauty brushes is the BK 101, a foundation brush. This is what I used today to put on my makeup."
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"This is the BK Beauty 101 brush. This is such a great foundation brush because it's got this domed shape here and the length of the hairs are tapered, so they're longer here on this side and shorter here on this side. It's very dense, but the fibers are very, very soft on this. And that is what I think makes this a perfect foundation brush."
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"The BK 101 which is the best foundation brush for mature skin. I use this every time I put on my foundation. I absolutely love it."
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"The BK 101 has been a favorite brush of mine for years because of how perfectly and smoothly it puts on my foundation. I never get a streak mark with my foundation, it always comes out looking great and it gives me such a natural finish. So whether you use it in a swiping motion or if you prefer to stipple on your makeup, that'll make a difference in how much coverage you get. Just having this brush against my skin, I just love how it feels."
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"If you want just one brush, I recommend the BK Beauty 101, my favorite foundation brush. It is [...] so soft and luxurious and puts your foundation on perfectly every time."
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"The BK 101 foundation brush is my holy grail foundation brush, and you also get it as a shrunken down version in my travel brush set."
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"This is a full-size version of the foundation brush that's included in my travel set, the BK101, which is the first foundation brush I ever loved."
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"One of my all-time favorite BK Beauty brushes is the BK 101, a foundation brush. This is what I used today to put on my makeup."
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"If you're looking for a great foundation brush, the BK 101 is amazing. It is my favorite. It puts on my makeup better than a beauty blender sponge, never a streak, works it into the skin, so it looks so natural. I love this brush."
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"This is my all-time favorite hands down foundation brush this is such a beautiful brush. I had always used a sponge to put on my Foundation before but now I use the BK 101 almost exclusively and it just lays my foundation so perfectly. [...] It's soft and luxurious and it's not too dense and it's not too stiff."
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"This is my favorite foundation brush. With these I think they make a great little bundle and these two together give you just about everything that you need to do your full face of makeup."
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"The BK 101 is my holy grail foundation brush. This literally changed how I put on foundation for the better forever. I stopped using a sponge when I started using this. Makeup just goes on so beautifully with this brush. It's gorgeous. You can get ten percent off on that one."
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"The BK 101 is the foundation brush that changed it all for me. I had never met a foundation brush that I liked before this one and it was just revolutionary. I couldn't believe the difference in how my makeup went on with this brush. It's just beautiful and soft and luxurious and great to use."
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"The BK Beauty 101 is their foundation brush and I use this brush constantly. It doesn't ever leave a streak mark, it's so soft, so luxe, it's just fantastic."
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"The BK Beauty 101 brush is hands down my absolute favorite foundation brush that I've ever used. It applies foundation so seamlessly and beautifully. That's why I based the A506 concealer brush on it, just shrunk down into a smaller size."
"I have to shout out the BK Beauty 101 brush. It's become, especially recently, one of my favorite foundation brushes. It's what I used today to blend out my foundation, it's so nice."
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"I'm going to apply that with the BK Beauty 101 brush. I'm so thankful for Lisa J and the BK Beauty team. BK Beauty is her brand and she's literally killing it with her brushes and her team is amazing."
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"For foundation I of course brought my BK Beauty 101 brush and that's what I used to apply this foundation."
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"I have to shout out the BK Beauty 101 brush. It's become, especially recently, one of my favorite foundation brushes. It's what I used today to blend out my foundation, it's so nice."
What the evidence says.
Independent of what the gurus think, this is what
the published research supports about the main active ingredients here.
Frequently asked.
What is BK Beauty 101/A101 Foundation Brush?
A dense, tapered foundation brush with a domed shape designed to apply base makeup smoothly without streaking or disturbing underlying skincare.
Is BK Beauty 101/A101 Foundation Brush worth it?
Yes. All 5 gurus who reviewed it give it their stamp of approval, for a Guru Score of 85%.
What is BK Beauty 101/A101 Foundation Brush's Guru Score?
BK Beauty 101/A101 Foundation Brush holds a Guru Score of 85%. That is our read on how warmly the experts talk about it, based on the verdicts of 5 expert reviewers we have collected.
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