Entrada's mobile app

Every year Inc. Magazine manages to convince thousands of private companies to divulge their otherwise closely held financial data to the publication in exchange for a chance at placing on the annual Inc 5,000 and Inc 500 fastest growing private companies in America lists.

While we're not in the habit of reporting on awards, Inc's is based on hard data, albeit self-reported: the percent change of annual revenue in a three-year period. Using this metric Inc placed nearly 400 health-related companies among its top 5,000, and a good number of them were digital health companies.

MobiHealthNews rounded up the top 10 private digital health companies on the list (along with Fitbit, which went public a few months ago). There are many other digital health companies profiled, (including Vitals, Dimagi, MedTouch, and more) so be sure to check out Inc's full list over here.

Read on for the top 10 private digital health companies willing to divulge their annual revenue figures. These are ordered as Inc ordered them -- by percent growth.

53. Fitbit. 2014 revenue: $745.4 million. San Francisco-based Fitbit, which went public in May, posted more than 5,000 percent growth over the past three years, according to Inc. During that same period it added 499 of its 579 employees. Fitbit offers wearable activity trackers and companion software. Site

57. Clinical Ink. 2014 revenue: $5.9 million. Horsham, PA-based Clinical Ink's revenue grew more than 4,600 percent over the past three years. The company added 90 of its current 98 employees during the period too. Clinical Ink offers mobile-enabled software for point-of-care, clinical trial data capture. Site

205. RxWiki. 2014 revenue: $2.4 million. Austin, Texas-based RxWiki's revenue grew more than 2,000 percent over the past three years and the company added 38 of its 44 employees during those years as well. The company offers a consumer site with medication information intended to help patients connect to pharmacists. Site

235. Welltok. 2014 revenue: $10.1 million. Denver, Colorado-based Welltok's revenue grew more than 1,800 percent in the past three years and added 189 of its 210 employees during that time too. Welltok works with insurers and others focused on population health management through tracking apps, connected devices, online communities, and other digital tools. Site

269. Patagonia Health. 2014 revenue: $3.2 million. Cary, North Carolina-based Patagonia Health grew more than 1,600 percent in the past three years and added 15 of its 21 employees. The company offers mobile-enabled, cloud-based tools for medical practices and public health organizations that integrate EHRs, billing, and practice management into one platform. Site

285. Live Free. 2014 revenue: $3.9 million. Pocatello, Idaho's Live Free, which offers the cellular-enabled LifeBeacon mPERS device and service, grew its revenues more than 1,600 percent over the past three years and added 21 of its 23 employees. Site

357. drchrono. 2014 revenue: $5.2 million. Mountain View, California-based drchrono grew its revenue more than 1,300 percent over the past three years and added 33 of its 46 employees during that period too. The company offers a tablet-centric medical practice management app. Site

358. Wellness IQ (Vitality). 2014 revenue: $2.4 million. Independence, Ohio's Wellness IQ grew its revenues more than 1,300 percent over the past three years and upped its headcount from two to 295 during the same period. The company offers the Vitality wellness program to employers. Site

469. MobileHelp. 2014 revenue: $28.8 million. Boca Raton, Florida's MobileHelp offers a mobile personal emergency response device and service. It grew its revenue almost 1,000 percent over the past three years and added 129 employees during that time too. Site

531. Connexion Point. 2014 revenue: $23.5 million. Salt Lake City-based Connexion Point added 1,015 of its 1,215 employees in the past three years, and grew its revenues by more than 800 percent during the same period. Connexion Point works with health plans and providers to engage members and patients. Site

695. Entrada. 2014 revenue: $7.9 million. Brentwood, Tennessee-based Entrada has developed an app that helps physicians dictate their notes. Through the app, physicians can organize patient notes, pictures, and other information in one place, and also send that data to an electronic health record. The company added 44 of its 64 employees in the past three years and grew its revenue more than 600 percent during the same period. Site