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Medical App for Real-time EKG Sensor Data Visualization

R-Style Lab developed an iOS data visualization app for an American digital health company. The application works in sync with a custom heart monitor, which enhances diagnosis and therapy of heart disease.

R-Style Lab developed an iOS data visualization app for an American digital health company. The application works in sync with a custom heart monitor, which enhances diagnosis and therapy of heart disease.
Technologies & tools
OpenGL, CoreData, Restkit, iOS SDK (Objective-C), Bluetooth
Project team
2 iOS developers, 1 PM, 1 QA


The custom heart monitor was enhanced with EKG sensors, which measured the electrical signals of a human body, providing a detailed picture of a patient’s condition. The client wanted to create an app to easily get access to incoming sensor data.

R-Style Lab created a front-end part of the solution and paired the app with the heart monitor via Bluetooth. The main challenge was to find a way to process sensor readings and visualize the data as medical heartbeat graphs at the speed of 300 dots per second.

The most obvious implementation option for this task from the get-go was the Core Plot library. However, the amount of incoming data was that large that it would have resulted in the lag in data processing and rendering, and the app wouldn’t have been able to comply with the 2-second speed requirements. Since fast real-time data visualization was critical for the healthcare device, R-Style team came with the idea of using OpenGL instead.

In order to enable real-time data visualization, our team had to segment Objective-C data into separate data units (raw C), transfer some of the workload to GPU and render C-data using OpenGL line primitives. Another requirement was to render some graphs with dotted lines, so we implemented OpenGL Fragment Shaders, which took each fragment (a rasterized pixel) as input and produced a single fragment as output. Thanks to OpenGL, the app was able to produce high-quality (300-500 dpi per second) solid and dotted line graphs with a delay of only 1/60 second.

The application can be used by both cardiologists and patients with heart disease. It has been approved by the US Food and Drug Administration.

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Hunter Jensen, CEO
Barefoot Solutions, Inc.
"Having worked with a lot of USA and non US-based development teams, R-Style Lab software development company is hands down the best I've seen. They have a high level of professionalism, excellent communication skills, thorough quality assurance practices, and superb technical expertise. I have been very satisfied with the quality of the software products that they have delivered, and everything has been delivered on time, on budget, and to spec."
Bolatbek Ospanov, Founder, CBDO
Smart Satu
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Marc Zirka, CEO
Telcovision Group
"Working with R-Style is a pure example of software development outsourcing. It was a great pleasure working with a competent and flexible team, where the focus is on the quality and the timeliness of the deliverables. R-Style developed for us the backend for FROGO our new Dating Mobile Application where the outcome was more than satisfactory. Moreover, R-Style team and leadership were providing us at all times their support and were available to answer any questions we had. Working with them gave us a great level of comfort and trust"  
Sergey Kiruschin, Head of IT department
“Work of R-Style Lab's specialists is a classic example of successful IT-outsourcing. We’ve been fully satisfied with the professional level of the work done.”  
Anton Karzhavin, Project Manager
Rive Gauche, perfume and cosmetics chain
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Mark Valentini, CIO of “Red Square” Ltd.
Eurovision, Song Contest 2009 in Moscow
“The project on the deployment of “Eurovision-2009” IT-infrastructure has been undoubtedly large-scale and labour-intensive. Its realization demanded for engaging a huge part of the company’s resources in a very limited time. Moreover, the project required for maximum focus as well as consolidation of all the company’s potentials. R-Style Lab specialists have fulfilled the task assigned to the full extent of their power. All the works were completed on a very high professional level.”  
Alexander Arikainen, Administrative Director
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