Hearing Test

A one-off web app for checking your own hearing and measuring a frequency response curve (ACH) — with the ability to compare your hearing against that of another person.

Features

• Test using a 3-AFC scheme (three blocks): pick where the tone played.
• Staircase 2-up / 1-down — adapts to your hearing threshold.
• Frequency range: 20–20000 Hz.
• Frequency-response plotting (Chart.js): each person's curve + the ISO 226 reference.
• Compare against another person's hearing: any profile can be set as the reference.
• Auto-save to localStorage + JSON export.
• Resume an unfinished test after a page reload.

How to run

Just open index.html in a browser — no server needed now that it is a plain script. Chart.js loads from a CDN, so an internet connection is needed on first load.

You can still run a local server (e.g. python -m http.server 8000); it keeps working fine with plain HTML.

How to use

1. Press ▶ on the person you want (or "+ Add person" to add one).
2. When you hear a tone, click the block where it played. Three blocks = choose one of three.
3. "Didn't hear anything" — when there was no tone at all (always the wrong answer).
4. ↻ — replay the current trial.
5. "ISO base" (the circle by a profile) — set that person as the reference for comparison.

Tech

• Plain html / css / js, no build step.
• Chart.js — loaded from a CDN.

Structure

• index.html — markup.
• style.css — styles.
• app.mjs — logic.
• ear.svg — icon.

Data

• Everything is stored in browser localStorage.
• "Download JSON" exports all results to a file.
• Moving to another device — copy this browser's localStorage.

License

MIT — see LICENSE.