Written by Amelia Foster | Last updated: June 2026
Purpose of This Website
VoiceFrequencyTest.com is a free, browser-based tool and educational resource for measuring and understanding the fundamental frequency of the human voice. The site is operated by Amelia Foster, acoustic phonetics researcher and voice analysis educator.
By accessing or using any page or tool on VoiceFrequencyTest.com, you agree to be bound by these Terms and Conditions. If you do not agree to these terms, please do not use this site.
These terms apply to all visitors and users of VoiceFrequencyTest.com, regardless of how you access the site or which device you use.
Use of the Voice Frequency Test
Microphone access The Voice Frequency Test requires microphone access to capture live voice audio for real-time fundamental frequency analysis. By granting microphone permission when prompted by your browser, you authorise the site to capture a live audio stream for the sole purpose of performing frequency analysis. This audio stream is processed entirely within your browser, is never transmitted to any server, and is never stored in any form. Full details of how voice audio is handled are documented on the Data Security page.
Permitted use You may use the Voice Frequency Test and all content on VoiceFrequencyTest.com for personal, educational, and professional reference purposes. You may share links to pages on this site freely.
Prohibited use You may not:
- Scrape, copy, reproduce, or republish the content of this site without written permission from Amelia Foster
- Use automated tools to access the site in a manner that places unreasonable load on the server
- Attempt to interfere with, disable, or circumvent any security feature of this site
- Misrepresent the source of this site’s content or present it as your own work
- Use this site in any way that violates applicable local, national, or international law
Tool Accuracy and Limitations
The Voice Frequency Test produces a real-time fundamental frequency estimate using browser-based FFT analysis and autocorrelation-based F0 detection. The practical accuracy of the tool is ±2–5 Hz under typical conditions — a quiet environment, a sustained voiced sound, and a functional consumer microphone.
This tool is provided as an educational and diagnostic reference resource. It is not a certified measurement instrument. Results should not be used as the sole basis for any clinical, professional, contractual, or safety-critical decision without independent professional verification.
A full account of the tool’s technical methodology, accuracy figures, and known limitations is available on the How It Works page. Known sources of measurement variation — including OS audio processing, consumer microphone low-frequency response, and breathy phonation — are documented on that page and on the Troubleshooting page.
No Professional Advice
Nothing on VoiceFrequencyTest.com constitutes professional voice coaching, singing instruction, speech-language pathology, laryngology, audiology, or any other form of regulated or certified professional service.
Content on this site is provided for educational and informational purposes only. Amelia Foster does not accept professional responsibility for decisions made on the basis of information or tool results obtained from this site. Where certified professional voice assessment, clinical diagnosis, or vocal health guidance is required, you should engage a qualified professional.
Acceptable Use
You agree to use VoiceFrequencyTest.com only for lawful purposes and in a manner that does not infringe the rights of others. In particular, you agree not to:
- Use this site to facilitate any activity that is unlawful in your jurisdiction
- Transmit any content through the contact form that is threatening, abusive, defamatory, or otherwise objectionable
- Attempt to gain unauthorised access to any part of this site or its underlying infrastructure
- Submit false or misleading information through the contact form
Amelia Foster reserves the right to restrict access to this site for any user who violates these terms.
Intellectual Property
All original content on VoiceFrequencyTest.com — including written text, tool design, technical documentation, educational articles, and page structure — is the intellectual property of Amelia Foster and is protected by applicable copyright law.
You may not reproduce, distribute, modify, or create derivative works from any content on this site without prior written permission from Amelia Foster. Brief quotations for the purposes of commentary, criticism, or educational reference are permitted provided the source is clearly attributed and a link to the original page is included.
The Web Audio API, browser technologies, and acoustic analysis algorithms referenced on this site are the intellectual property of their respective owners and standards bodies.
Privacy and Cookies
Your use of VoiceFrequencyTest.com is also governed by the site’s Privacy Policy and Cookie Policy, which are incorporated into these Terms and Conditions by reference.
- Privacy Policy — what data this site collects and how it is used
- Cookie Policy — what cookies this site uses and how to manage them
By using this site, you acknowledge that you have read and understood both policies.
Limitation of Liability
To the fullest extent permitted by applicable law, Amelia Foster and VoiceFrequencyTest.com shall not be liable for any direct, indirect, incidental, consequential, or special damages arising from:
- Use of or inability to use this site or its tools
- Reliance on any frequency reading, scientific information, or educational content published on this site
- Any decision — clinical, professional, commercial, financial, or personal — made on the basis of content or tool results obtained from this site
- Interruption, suspension, or termination of access to this site
- Any security incident affecting data voluntarily submitted through the contact form
As VoiceFrequencyTest.com is a free service, the maximum liability of Amelia Foster to any user shall not exceed zero.
External Links
VoiceFrequencyTest.com contains links to external websites for reference purposes — including acoustic phonetics literature, vocal health resources, browser documentation, and audio technology publications. Amelia Foster does not endorse, control, or accept responsibility for the content, accuracy, privacy practices, or availability of any external site. Accessing external sites via links on this site is entirely at your own risk.
Governing Law
These Terms and Conditions are governed by and construed in accordance with applicable law. Any dispute arising from your use of VoiceFrequencyTest.com shall be subject to the exclusive jurisdiction of the courts in the territory in which Amelia Foster operates this site. If any provision of these terms is found to be unenforceable, the remaining provisions shall continue in full force and effect.
Changes to These Terms
Amelia Foster reserves the right to update these Terms and Conditions at any time. The current version is always published at this URL with the “Last updated” date shown above. Continued use of VoiceFrequencyTest.com after an update constitutes acceptance of the revised terms. Material changes — such as the introduction of advertising or paid services — will be announced on the site homepage before taking effect.
Contact
If you have questions about these Terms and Conditions or wish to request permission to reproduce content from this site, contact Amelia Foster directly:
Email: contact@voicefrequencytest.com Contact form: voicefrequencytest.com/contact/
These Terms and Conditions apply to all pages and tools on VoiceFrequencyTest.com. Written by Amelia Foster. Last updated: June 2026.