Do you remember when we first wrote about ThirdLove back in August? It’s an app that’s hoping to solve the “perfect bra” problem once and for all by allowing you to measure your chest size right from your phone. Wait… what? Yeah, we had that reaction, too.

Good news, ladies! Now’s your chance to try this one out yourselves. ThirdLove launched this morning in the iOS App Store. We gave it a spin, and here’s what we learned.

After downloading the app, you’ll be prompted to create an account. Once that’s done, you can start shopping or you can get fitted. Using a patented computer vision technology, the app takes two selfies from the front and the side, then turns the 2D images into 3D images which it uses to figure out exactly what size bra you need. And don’t worry, you don’t have to be naked. You’ll be instructed to take the photos with a tank top on and a basic, supportive bra underneath. No push-ups or sports bras — those paint an inaccurate portrayal of your true chest size.

Alright, how easy is it to snap these pics? Thanks to a long product testing period (as in, about a year long), ThirdLove developed a surprisingly user-friendly video tutorial that instructs you as you go. A woman in the video models each pose, and a Siri-like voice tells you when you have the angles just right. Note that it does take a few tries to get your phone positioned correctly—you’ll be instructed to tilt the phone towards the mirror or raise the right or left end of the phone until you’re in place.

Once you’ve smiled for the camera, you’ll be sized and ready to shop.

Here’s the somewhat genius part: the ThirdLove team has figured out that about 60% of women are actually somewhere in between a cup size. Meaning, some might be between an A and a B, even though they typically wear a B. This app uses a proprietary sizing system to tell you if you are a “half size” to ensure that those cups fit just right.

After the sizing is complete, the app will direct you to a gallery of beautiful lingerie in a variety of colors, fabrics, and styles that has been filtered to match your perfect size. Bonus: Since every item in the collection is sized for you, you’ll never have to worry about a product being out of stock. Only bras currently available in your size will be shown.

All in all, we’re digging this high-tech foray into the lingerie world. The whole sizing process takes 5-10 minutes and then you can get to the fun part—shopping! Any downfalls? The sizing process can be a bit tricky—be sure to watch the video tutorial closely. Also, since ThirdLove has developed their own unique sizing system, you won’t be able to measure here and purchase elsewhere. You’re relegated to buying a bra from ThirdLove and can’t shop anywhere else.

Our conclusion: the computer vision technology on this app is super cool, and we can’t wait to see how their bras fit. Their collection is also beautifully designed—we’re big fans of the mesh plunge style. With bras starting at $45, it’s definitely a great option, but it likely won’t be the only place we ever shop for a good bra.

Will you try ThirdLove? Let us know in the comments below!