99Dresses is e-commerce “crack for women”

99Dresses co-founder Nikki Durkin describes her company as an enabler to one of the world’s most powerful drugs: shopping.

“I have created crack for women,” said Durkin at today’s Y Combinator Demo Day.

The company allows women to upload items …

Matterport’s scanner can create a 3D model from anything

3D printing is turning heads these days, especially with do-it-yourselfers. Y Combinator startup Matterport has invented a small scanner, pictured above, that can scan any space or object and create a 3D model.

“We turn reality into 3D models and …

Ark’s cute penguin knows who you are, and is letting people search for you

There a new search engine in town to freak out about: Ark, a “people” search engine that scrapes social networks to compile its own profile of you.

Ark found that over 30 percent of searches were for individuals. The startup …

Hackpad aims to build a better wiki with real-time updating

Creating and managing a wiki can take work. It requires a special syntax to format your text and build out the wiki how you’d like it. Hackpad is trying to make the wiki fresh again, with real-time updating and no …

Shoptiques pulls boutiques, a traditionally offline industry, into the e-commerce world

Boutiques are the last type of store you’d expect to get technical, but Shoptiques co-founder Olga Vidisheva is confident she can bring the tiny shops to your digital doorstep.

“The type of inventory boutiques sell is produced in small batches,” …

Pair lets you kiss your lover with your thumb, share private moments of love

If your friends are sick of seeing lovey-dovey status updates meant only for your significant other, it might be time to take your love to a new private social network.

Pair is an iOS app for couples to share pictures, …

Kyte uses an Android app to protect your kids from smartphone evils

The problem with kids these days is … actually a problem with smartphones. Parents are hard-pressed to find a safe way let kids have the smart-gadgets they really want. Kyte, however, believes it has found a solution for Android phones.…

Priceonomics is a price search engine for all the stuff you want to buy

Priceonomics wants to be the service to tell you how much anything you want to buy will cost you. Following in the footsteps of FindTheBest, Priceonomics searches for prices on consumer goods so you can compare sellers and find the …

Walkie talkies are the future of communication, according to TiKL

Where much of technology tries to push new ideas into the hands of consumers, TiKL is putting an old stand-by on smartphones: the walkie-talkie.

“We created TiKL with the vision of redefining the way we communicate,” said co-founder Zafir Ahmed …

Luma stabilizes mobile video as you shoot it

Midnox wants to help maximize the iPhone’s great camera to shoot awesome video. Its app, Luma, stabilizes video as you record in real time to give it a more clean and professional look.

Typically, you have to use an editing …

Crowdtilt lets you pool money among friends

Crowdtilt wants you to take the pool of money your friends gather for a vacation and put it online. The company does crowdfunding for small groups of people who already know each other; friends and family looking to pool their …

“Airbnb for car repair” Your Mechanic brings a mechanic to you

Waiting in a mechanic shop while your car gets a new set of brakes can be incredibly boring. Your Mechanic takes the auto shop out of the equation and brings a mechanic to wherever you are, instead of you going …

Sonalight wants to be a Siri that “saves lives”

Apple’s virtual-assistant Siri isn’t available on Android phones, so copycat apps are popping up all over the Android Marketplace. Sonalight, however, promises to not just be another voice-activated assistant app, but rather a life-saving voice-activated assistant app.

“I’m from the …

Movin’ on up: 42Floors helps tenants find the perfect office space

42Floors is breaking into the commercial real estate world, helping new tenants find office spaces in an otherwise broker-run industry.

“This process is really broken,” said 42Floors co-founder Jason Freedman. “We have the determination and the talent … we’re going …

Coderwall spices up resumes for coders with “geek cred”

Old-fashioned paper resumes are starting to disappear, and Coderwall has a plan to replace them. The startup creates resumes for coders and developers that show off how great they are at the jobs they already have. Using gamification, developers can …

Invest alongside your favorite celebrities with Givespark

Celebrity investors are on the rise, with Justin Timberlake, Ashton Kutcher, Selena Gomez, Lady Gaga, and a number of other big names throwing money into hot new startups. But what if they took advantage of their influence to boost crowdfunding …

Control your music like a ninja with Flutter

You’re jamming out to your favorite track on Spotify, and then all of a sudden a song that makes your want to scream starts playing. Instead of running over to your computer and frantically pressing keys and clicking at your …

PlanGrid takes an antiquated product mobile: Blueprints

There was once a time when blueprints existed as big spools of paper, spread out across an architect’s desk. Despite computer-aided design, architects on the job still lug that paper around. PlanGrid is making the obvious and needed move to …

Y Combinator shows off 39 companies at Demo Day

Y Combinator’s semi-annual Demo Day is taking place today, and 66 companies are pitching their products at the Computer History Museum in Mountain View, California. Twenty seven of the presenting companies are still in stealth mode.

Twice a year, the …