Tune first. Trust the reading.
TuneToy is a free instrument tuner designed around a simple promise: identify the string you intend to tune, measure it accurately, and keep the microphone signal on your device.
Why TuneToy exists
A basic chromatic tuner reports the nearest musical note. That is useful for identifying arbitrary pitches, but it can be misleading when a guitar string is badly flat: the wrong note may appear nearly centered. TuneToy's instrument modes compare the sound with the strings in the selected tuning instead. The display keeps guiding you toward the intended string, and a manual string lock is available when a string starts far away.
How accuracy is checked
The pitch detector uses the YIN method and is exercised against pure tones, harmonically rich plucked-string models, noise, and missing-fundamental signals that can cause simpler detectors to jump an octave. The current automated browser battery measures worst-case synthetic error below six tenths of a cent, including 0.04 cents on its pure-tone sweep. In everyday use, microphone quality, background noise, string attack, and instrument setup matter far more than the detector's numerical limit. The test method and limitations are published so this claim can be checked rather than taken on faith.
Privacy is part of the architecture
Microphone access begins only after you press Start tuning. The browser supplies short audio buffers directly to the pitch detector; TuneToy does not record, upload, transmit, or store them. There is no account system or database of tuning activity.
Built to remain a small, useful tool
TuneToy is an independent collection of browser utilities rather than an app-install funnel or lesson subscription. Its focus is deliberate: fast access, clear guidance, practical tools for musicians, and dependable behavior on the device already in your hand.
Publisher and editorial responsibility
TuneToy is independently operated. Its tools, tuning guides, privacy explanations, and test documentation are written and reviewed for this site rather than assembled from syndicated articles. TuneToy does not accept payment for favorable coverage. Corrections, browser-compatibility reports, and questions about the published test method go directly to hello@tunetoy.com.
From tuning to playing
TuneToy Beat Box brings the same local-first approach to rhythm. Its drum sounds are synthesized on the device with the Web Audio API, and its 16-step sequencer can be used for practice, songwriting, or quickly sketching a groove without an account or an install.
Jam Along supplies a synthesized backing band and a live fretboard map for exploring scales in any key. TuneToy Piano turns the browser into a colorful, polyphonic keyboard that works with touch, mouse, or computer keys. Both tools create their sound locally.
A separate family area
TuneToy Play and Little Lessons form a separate, grown-up-guided family area. Those pages do not load advertising or analytics. When a family activity opens one of the music tools in kids mode, that visit also disables advertising and analytics and returns to the family area rather than the general tuner.