01 / Why it exists
Make a closer look easier
Display issues are often subtle. A tiny pixel, a bright corner, or a rough gradient can disappear behind a busy desktop. Firth removes that visual noise with simple reference fields.
Every test runs in the browser and presents instructions in context. No result is uploaded, scored, or turned into a claim about your hardware.
02 / What you can inspect
Nine focused visual references
Solid ColorCycle through black, white, RGB, cyan, magenta, and yellow to look for unusual bright, dark, or fixed pixels.
Black ScreenUse an uninterrupted black field to inspect possible edge glow, bleed, clouding, or uneven dark areas.
Uniformity FieldsCompare center, edges, and corners across neutral fields at several brightness levels.
Pixel GridSwitch among horizontal lines, vertical lines, a reference grid, and a checker pattern.
Sharpness TargetInspect fine text, radial lines, concentric targets, and corner detail for apparent softness or halos.
Contrast StepsCompare near-black and near-white steps to see whether adjacent tones remain distinguishable.
Grayscale RampView stepped and continuous gray ramps for abrupt jumps, tinting, clipping, or visible banding.
Color RampsInspect red, green, blue, cyan, magenta, and yellow transitions from dark to bright.
Motion TrailTrack a moving reference at three speeds to compare perceived blur, trailing, and animation smoothness.
03 / Principles
How Firth is designed
Clarity first
Each pattern has one visual purpose and a short explanation.
Local observation
The screen patterns run on your device; there is no account or result upload.
Measured language
The tool helps you inspect possible issues without promising a diagnosis.