Terms of Use

App: Spectrum Analyzer – Audio FFT
Developer: Josef Dave Reyes Llorente
Effective date: August 23, 2026

Agreement

These Terms of Use (“Terms”) govern your use of the iOS application Spectrum Analyzer – Audio FFT (the “App”) provided by Josef Dave Reyes Llorente (“we,” “us,” or “our”). By downloading, installing, or using the App, you agree to these Terms, Apple’s Licensed Application End User License Agreement (or any custom EULA presented in the App Store), and the App’s Privacy Policy and Content Rights notice.

If you do not agree, do not use the App.

The App

The App provides on-device, real-time spectrum analysis using the device microphone, including FFT visualization (roughly 20 Hz–20 kHz), spectrogram display from a short in-memory buffer, peak frequency detection, tap-to-probe readout, peak hold and freeze, approximate input-level metering, multi-band energy meters, display and smoothing controls, and optional Pro tools such as higher FFT resolution, additional band meters, A/C/Z weighting, reference tones, fullscreen spectrum, peak-flash/haptic alerts, approximate THD estimation, and howl/feedback detection. Optional Pro features are unlocked through a one-time Apple In-App Purchase.

The App is a consumer visualization and estimation tool. It is not a calibrated professional sound-pressure-level meter, laboratory instrument, medical device, or safety-certified measurement system. THD, howl detection, weighting, and level readouts are approximate and not certified for professional, regulatory, or safety-critical use.

Eligibility and Accounts

You must be able to form a binding agreement under applicable law and comply with App Store age and account requirements. The App does not create a separate developer account; access is through your Apple ID and device as managed by Apple.

Microphone Permission

Core analysis features require microphone access. You control permission in iOS Settings. If you deny microphone access, features that depend on live audio will not function. Audio is processed on-device as described in the Privacy Policy.

Acceptable Use

You agree not to:

• Use the App for unlawful purposes or in violation of others’ rights
• Interfere with or disrupt the App’s normal operation
• Attempt to circumvent Pro purchase or restore mechanisms except through Apple’s supported restore flows
• Misrepresent measurements produced by the App as certified professional readings
• Copy, reverse engineer, or redistribute the App except as allowed by law or Apple’s terms

Purchases

Optional Pro unlocks are sold as a one-time In-App Purchase processed by Apple. Pricing, billing, taxes, refunds, and restores are handled under Apple’s App Store terms and policies. We do not operate a separate payment processor for the App.

Intellectual Property

The App and related materials are protected by intellectual property laws. Ownership and usage limits are described in the Content Rights notice. These Terms do not transfer ownership of the App to you.

Disclaimer of Warranties

To the maximum extent permitted by law, the App is provided “as is” and “as available,” without warranties of any kind, whether express, implied, or statutory, including implied warranties of merchantability, fitness for a particular purpose, accuracy, and non-infringement.

Frequency readouts, spectrum and spectrogram displays, band meters, level indications, THD estimates, and howl/feedback alerts are approximate and may vary by device microphone, environment, iOS audio routing, and settings. Do not rely on the App as the sole basis for professional audio engineering, hearing safety decisions, regulatory compliance, or emergency response.

Limitation of Liability

To the maximum extent permitted by law, Josef Dave Reyes Llorente will not be liable for any indirect, incidental, special, consequential, or punitive damages, or any loss of data, profits, or business, arising from or related to your use of the App, even if advised of the possibility of such damages.

To the maximum extent permitted by law, total liability for claims relating to the App will not exceed the amount you paid for Pro features in the App during the twelve (12) months before the claim, or zero if you only used free features.

Some jurisdictions do not allow certain limitations; in those cases, the limitation applies to the fullest extent permitted.

Apple Relationship

These Terms are between you and Josef Dave Reyes Llorente, not Apple. Apple is not responsible for the App or its content. Apple has no obligation to provide maintenance or support for the App. In the event of any failure of the App to conform to an applicable warranty, you may notify Apple, and Apple may refund the purchase price of the App (if any) as required by Apple’s policies; to the maximum extent permitted by law, Apple has no other warranty obligation. Apple is a third-party beneficiary of these Terms and may enforce them against you regarding your use of the App.

Changes

We may update these Terms by posting a revised version on this page and updating the effective date. Continued use of the App after changes become effective constitutes acceptance where permitted by law.

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