About the author: Harlow founded VoiceRangeTest.com and runs it independently: they build and test the tools, research and edit the guides, and handle corrections. This page explains what that work involves and how to check it.
What Harlow does on VoiceRangeTest.com
- Plans, builds and tests every browser tool, from the main voice range test to the practice tools.
- Researches, writes and edits the guides and singer vocal-range analyses, and approves every page before it goes live.
- Keeps the trust pages (editorial rules, testing method, privacy) in line with what the site actually does.
- Reads correction reports and fixes errors, including in tools that are already live.
Topics Harlow covers
Vocal range and voice types
How range is measured, how it differs from comfortable working range, and how the classic voice types compare. Start with the types of vocal ranges, the human vocal range, tessitura and the vocal range chart. One idea runs through all of them: a measured range is useful, but it does not decide your voice type on its own.
Pitch, notes and frequency
How a note name relates to hertz and cents, and how the site’s Pitch Detector, Note Identifier and Voice Hz Test turn microphone input into those numbers.
Practice and ear training
Singing in tune and hearing intervals, with tools such as the Pitch Accuracy Test and Interval Ear Training, and guides like how to improve pitch accuracy.
Singer vocal ranges
Articles such as the highest vocal ranges look at what singers actually sing on recordings and live, and separate a usual range from rare extreme notes, effects and transposed performances. All articles are listed on the blog.
How Harlow tests the tools
Each tool version is tested before release in a clean WordPress install, in a headless browser with a simulated microphone. The test audio has known answers, so the tool’s output can be compared with the truth: for example, the Pitch Detector read a 220 Hz tone as 220.0 Hz, a tone set 20 cents above A4 as 445.1 Hz (+20 cents), a low E1 at 41.2 Hz as 41.2 Hz and a C7 within 1 cent. Silence, noise and a blocked microphone are tested too, and each layout is checked at phone widths.
The suites for the main tools passed between 27 and 52 checks each with no failures, and they also recorded what was not covered: Safari (desktop and iPhone), Firefox, a physical Android phone and real human voices. The Voice Range Test, for example, passed 32 checks, and the Voice Type Test 33.
Testing is where problems show up. Examples Harlow fixed before release: the Note Identifier named only one “most frequent note” when two notes tied, the Voice Type Test’s headline could disagree with its own chart when two types matched equally, and form fields overlapped on themes that change box sizing. The method is written up in our testing methodology.
Recent work
In September 2026 Harlow rebuilt the site’s main microphone tools as version 2.0.0. The older versions used plain autocorrelation, a simple pitch method that can jump an octave on a sung note, and one of them reported a “confidence” figure that meant little. The new versions share one engine based on the YIN method, add a clarity check and a median of three readings, and the range tools only accept a note once it is held steadily. Each rebuild shipped with its own test report.
The same month, the trust pages were rewritten so that every privacy and accuracy statement matches the live code. That check found older wording which suggested some tools might record or upload audio; none do, and the wording was corrected.
How Harlow researches and writes
- Music theory and acoustics facts are checked against established references, not copied from other tool sites.
- Voice and health topics lean on official health sources and are kept general: the site does not diagnose.
- Singer ranges are built from recordings and credible references; a single viral number is not accepted as proof.
- Estimates, reported values and disputed points are labelled, so readers know how firm each statement is.
- AI software may help with outlines or proofreading, but facts are checked against sources and Harlow approves the final text.
The full rules are in the editorial guidelines, and the limits of browser measurement are in accuracy and limitations.
What Harlow does not claim
Harlow is not presented as a voice clinician or a medical professional, and this site lists no qualifications for them. Please judge the work by the evidence on these pages: the test results, the stated limits and how errors are handled. For voice pain, lasting hoarseness or a sudden change, see a qualified health professional; the disclaimer explains why.
Contact Harlow
Corrections, tool problems and questions go to contact@voicerangetest.com, or use the contact page. You can read more about the site itself on the about page.
Last reviewed: 27 September 2026