FreqFinder
Hear a tone. Find it again by ear.
5 rounds. A pure tone plays for 3 seconds — then drag across the waveform to find it. The tone follows your finger and stays on until you lock it in. No replays.
About FreqFinder
FreqFinder is a pitch-matching ear-training game. A pure sine tone plays for three seconds (one second in Hardcore), then disappears, and you have to recreate the same frequency on a logarithmic waveform control. Default range is 80–1200 Hz, a comfortable middle band that covers most of the human voice and the lower octaves of music. Optional High-Frequency mode opens it up to 8 kHz for a tougher challenge. Five rounds, scored on absolute Hz difference from the target — so smaller delta always means a higher score.
How to play FreqFinder
Listen carefully — there are no replays. After the tone disappears, drag across the animated waveform to scrub through frequencies. The tone follows your finger and stays on after you release, which lets you mentally compare it to the target you remember. Lock in your guess with the Submit button. Arrow keys nudge by ±2% (or ±0.5% with Shift held) for fine adjustment. Submit plays a small click, the score reveal plays a chime.
Tips for higher scores
Use a fixed reference: middle A is 440 Hz, the start of the human voice's comfortable range is around 200 Hz, and a high-pitched whistle sits around 2000 Hz. The waveform's cycle density is a visual cue — more cycles drawn across the canvas means a higher frequency — but trust your ears, not your eyes. The tolerance band gives you a perfect 100 within ±1 Hz of the target, so chasing sub-Hz precision is wasted effort.