This company is ranked #175 on the 2016 Inc 5000 list!
Inc Magazine says this about them:
Provides Web-based software that helps real estate brokers manage customer relationships, properties, listings, deals, and back-office tasks.
Located in Denver, CO, Apto saw a 2079% growth in 2015 and generated $2.3 M in revenue.
Check out their website: apto.com