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Dev tools · September 4, 2026

HandleKit

Free, private vision & hearing screening in your browser

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What it does

Free browser-based screening labs & tools: Clinical Pelli-Robson contrast sensitivity, high-frequency hearing age test, tinnitus sound therapy, safe zone visualizer, and precision digital utilities. 100% private, no sign-up.

Scientifically validated sensory screening tools and sharp digital utilities. 100% private client-side processing, instant browser calibration, and zero registration required. Screen for subtle contrast loss, night driving glare, and visual pathway fatigue using the official clinical Pelli-Robson Log CS benchmark. Determine your biological ear age by evaluating your upper auditory limit (8 kHz - 20 kHz). Test high-frequency presbycusis and mosquito tones. Pinpoint the exact pitch of your ear ringing (250 Hz - 16 kHz) and generate customized notched sound therapy maskers to soothe phantom audio perception. Scientific Delta-E color perception benchmark. Measure your visual cone photoreceptor…from handlekit.com

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