Hertzle (HalfQuiz)

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Listen to three tones and guess each one's frequency in hertz.

on halfquiz.com

Hertzle #277 on HalfQuiz: round 1 with a Stop button for the tone, a guess of 440 Hz marked Sounds like an A, and scores for three rounds out of 600

Hertzle is a daily listening game on HalfQuiz. You hear a tone, guess its frequency somewhere between 150 Hz and 2,500 Hz, and score up to 200 points by how close you are; three rounds make a maximum of 600 points.

About Hertzle (HalfQuiz)

Hertzle tests your ear with plain tones. Each round plays a sound, and you set your guess in hertz with a number box; on the easier settings the game also tells you what note your guess sounds like, such as 440 Hz sounding like an A. Your score for the round depends on how close your guess lands to the real frequency, up to 200 points, and three rounds add up to a total out of 600.

Difficulty changes how much help you get: Easy lets you play your guess back to compare, Medium shows the approximate note, and Hard gives no help at all. You can also choose a sine or triangle waveform.

The Daily mode is one numbered quiz per day, the same for everyone, and signing in puts your score on a leaderboard. Free Play generates unlimited random quizzes. HalfQuiz hosts other quiz games beside it. It suits musicians and anyone curious how well they can judge pitch.

How to play Hertzle (HalfQuiz)

Choose a difficulty and waveform, keep Game Mode on Daily, and press Start Game (mind the volume).
Listen to the round's tone.
Enter your guess in hertz, between 150 and 2,500, and press Guess.
Play all three rounds for a total out of 600.

Tips

Learn a few anchors: concert A is 440 Hz, and each octave doubles the frequency.
On Easy, play your guess back and compare it with the tone before submitting.
Low tones are harder to judge on small speakers; use headphones.