"The city moves at... at its own speed, right? And we always want to maximize our time."

Busy New Yorkers would readily agree with CJ Bertram, who is at the recent Tech Day event in New York city.

Over 500 tech startups were on hand.

Many of them like Bertram's startup "Looop" displayed a distinctive New York sensibility.

"We build in coffee shops and we, hey, look at this, we couldn't find seats or we watched people come in and the line was long we saw them left."

Looop lets users know how crowded restaurants and bars in the city are at any given time.

"We integrate sensors on that part stereo scopic and it's set overhead
 and it basically gets integrated by the entrance of the venue.

So we're able to understand when people are approaching or people are leaving."

Running out of battery power is another common problem for on-the-go New Yorkers, so Leo Tawilian and his team developed Hoplite Power.

"We are building a network of hubs like this one you see here that dispense portable battery pats."

Hoplite batteries are 299 (cents) for the day and can be returned to any hub kiosk around the city.

"For New Yorkers and others around, mobility is key.

So we figured if there're bike-sharing systems and car-sharing systems, why can't we create a power-sharing system."

New York neurosurgeon Osamah Choudhry is also harnessing technology to shake up his industry.

"Our vision is to bring holographic visualization to medicine."

Using Microsoft's HoloLens, a wearable holographic computer, his start-up MediVis allows doctors, medical students and patients to interact with 3-D models.

"As physicians and surgeons we operate and we take care of patients who have a three dimensional body.

Patients deserve to see and know about their medical issues in a way that's most intuitive to them.

They cannot read CAT scans or MRIs."

Choudhry believes holographic visualization can ultimately save hospitals money and improve safety.

At New York Tech Day, the ideas were as diverse as the city these entrepreneurs call home.