The Electronic Frontier Foundation has suggested the app - which is owned by Amazon - was "packed" with third-party tracking and sending out personally identifiable information.
The organisation said: "The danger in sending even small bits of information is that analytics and tracking companies are able to combine these bits together to form a unique picture of the user's device.
"This cohesive whole represents a fingerprint that follows the user as they interact with other apps and use their device, in essence providing trackers the ability to spy on what a users is doing in their digital lives and when they re doing it."
However, Ring - which is said to have sent information to Facebook, Google's Crashalytics, ApplsFyler, Branch and MixPanel - has said it limits the amount of data shared.
The firm told Gizmodo: "Like many companies, Ring uses third-party service providers to evaluate the use of our mobile app, which helps us improve features, optimise the customer experience and evaluate the effectiveness of our marketing."