It looks like there might be a slight mix-up in the name! There isn’t a well-known tool called “Emma’s Controller Tester.” It is highly likely you are looking for Fred’s Controller Tester, a very popular open-source software tool created by developer Fred Emmott.
Alternatively, if you are referring to a generic online tool, you might be thinking of Gamepad Tester (hosted on Hardware Tester), which is the most widely used web browser-based diagnostic utility for gaming hardware. About Fred’s Controller Tester
If you are troubleshooting advanced gaming gear, Fred’s Controller Tester is a dedicated Windows application built primarily for flight simulation and sim-racing enthusiasts. It is heavily utilized by the r/hotas (Hands On Throttle-And-Stick) and r/simracing communities to test complex hardware. Key features include:
Dual-API Testing: It tests hardware using both DirectInput and XInput, allowing you to see how your computer interprets raw device data versus universal Xbox-style commands.
Massive Input Handling: While standard testers max out at a few buttons, Fred’s tester can easily manage 128+ buttons, multiple hats (POVs), and numerous independent axes.
Visual Calibration Tracing: It uses color-coded metrics to show axis ranges. Green indicates a fully tested, healthy range; Orange flags potential calibration errors where the stick isn’t quite reaching its maximum edge.
Sim-Specific Layouts: It natively handles niche hardware combinations, such as sim-racing handbrakes that possess only a single axis and zero buttons. About Web-Based “Gamepad Testers”
If you aren’t using flight sticks or racing wheels and instead just want to check a PlayStation, Xbox, or Nintendo Switch pad, the universal solution is a browser-based Gamepad Tester. Key features include:
Zero Installation: It reads your controller directly through your web browser (Chrome, Edge, etc.) using the native HTML5 Gamepad API.
Stick Drift Diagnosis: It tracks the precise coordinate decimals of your analog sticks. If the coordinates do not return to 0.00 when you let go, it visually maps your stick drift.
Vibration and Feedback: It allows you to trigger and test the force-feedback rumble motors inside your controller.
To point you to the exact tool or download link you need, what kind of controller are you trying to test (e.g., an Xbox gamepad, a PlayStation controller, or a flight simulation joystick/HOTAS)? fredemmott/Freds-Controller-Tester – GitHub
Leave a Reply