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Re:Show HN: Density – The Heartbeat of a City by jsprogrammer on Tuesday April 21, 2015 @07:31PM (#9417878)
Looks like the business has to purchase (proprietary?) hardware to install on-premises.

Usefulness will depend on whether the location you are interested in has the required hardware.

Re:Show HN: Density – The Heartbeat of a City by jordanmessina on Tuesday April 21, 2015 @08:16PM (#9417953)
Generally, we give the hardware away for free (circumstance dependent). We'd prefer to monetize the data. We don't really want to build a company on $49.99 / mo. There are a lot of other players in that game. Here's a picture of the sensors if you're interested: http://i.imgur.com/zLUMAG8.jpg?1