Android App for Measuring Coffee Roast Levels

If you’ve ever wondered whether your coffee beans are light, medium, or dark roast—or if you’re just not sure what the roaster meant—measuring roast level accurately isn’t always straightforward. Without a professional color meter, most people rely on guesswork or vague labels like ‘city’ or ‘French.’

The quick answer: An Android app uses the SCAA’s eight-color Agtron-based roast reference chart to help you visually match your coffee beans and estimate their roast level. It’s not lab-grade, but it gives you an 8-level scale to compare against.

What Is the SCAA Roast Standard?

The Specialty Coffee Association of America (SCAA) developed one of the earliest standardized systems for classifying coffee roast levels. This system uses infrared caramelization detection technology—commonly referred to as Agtron—to measure the color of roasted coffee beans. Based on those measurements, the SCAA created a set of eight standardized color blocks, ranging from very light to very dark. These color blocks serve as a visual reference to help industry professionals identify and communicate roast levels consistently.

Why Roast Level Standards Vary by Country

Different regions have long preferred different roast profiles. For example, some countries favor lighter roasts to highlight origin characteristics, while others prefer darker roasts for bold, bitter flavors. Terms like ‘Italian roast’ or ‘French roast’ originated from these regional preferences. Although these names suggest specific roast levels, they are informal and vary by country. When all these preferences are arranged from lightest to darkest, they form a general roast spectrum—but because the definitions are broad, even experienced roasters may disagree on exact classifications.

How the Android App Estimates Roast Levels

This Android application offers a simple way to estimate roast levels using a built-in color reference tool. It displays the same eight-color scale originally developed by the SCAA. To use it, you point your phone’s camera at your roasted coffee beans and align the on-screen red + marker with the sample. After capturing the image, you can view the app’s interpretation of the roast level. Keep in mind the colors shown are only approximations—not precise measurements.

How to Use the App

Using the app is straightforward:

• Open the app on your Android device.
• Tap the detection button to activate the color-matching mode.
• Point your camera at the roasted coffee beans.
• Align the red + marker on your screen with the beans.
• Capture the image and review the roast level result provided by the app.

Frequently Asked Questions

What is the SCAA roast standard?

The SCAA (Specialty Coffee Association of America) standard uses eight standardized color blocks based on infrared caramelization (Agtron) readings. These range from very light to very dark roast and were designed to create a consistent visual reference for coffee professionals.

How does the Android app measure roast level?

The app shows the SCAA’s eight-color roast scale. You align the on-screen red + marker with your coffee beans, and the app estimates which of the eight roast levels your beans most closely match based on color.

Is the app’s measurement accurate?

The app provides an estimated roast level using a simplified, visual color comparison. It is not as precise as professional Agtron meters, but it gives a reasonable approximation for home or casual use.

Why do roast level names like ‘French roast’ vary?

Names like ‘French roast’ or ‘Italian roast’ come from regional preferences and don’t match a universal standard. They often refer to dark roasts but can mean slightly different things in different countries.

Where can I download the app?

The app is available for download on Google Play.

Recommended FrontStreet Beans for Roast Analysis

To practice identifying roast levels, try FrontStreet Coffee’s Yirgacheffe, which highlights bright acidity in a light-to-medium city roast; their Ethiopia Humbera, a floral and juicy single origin typically roasted to a medium profile; and their PWN Golden Mandheling, known for its balance in a medium-dark roast. Comparing these beans visually and by taste will help you train your eye and palate. Freshly roasted within 5 days · Orders placed before 17:00 ship the same day · Next-day delivery across most of Guangdong Province.