Last Updated: May 26, 2026
Frequency Analyzer ("the App") is provided by Ertuğrul Sarı. By downloading, installing, accessing, or using the App, you agree to the following terms and conditions. If you do not agree with these terms, you should not use the App.
The App is designed to perform real-time audio analysis, including frequency spectrum and spectrogram visualization, sound pressure level (SPL) metering, octave-band analysis, waveform display, and noise dose calculation against NIOSH, OSHA, or user-defined criteria. The App is available for personal, non-commercial use and is intended for informational and educational purposes only.
The App is not a Class 1 or Class 2 sound level meter under IEC 61672 and is not a certified occupational noise dosimeter. Readings depend on the iPhone microphone, the device model, environmental conditions, the calibration values you provide, and the surrounding acoustic field. The App must not be used as the sole basis for workplace exposure documentation, regulatory compliance with OSHA, NIOSH, ISO, or other occupational health standards, hearing-protection decisions, environmental noise reports submitted to authorities, legal proceedings, or any other situation that requires a certified measurement instrument. For regulated measurements, use a properly calibrated, type-approved instrument operated by a qualified professional.
The App is intended for users who are at least 13 years of age, or 16 in the European Economic Area. By using the App, you represent that you meet this requirement.
The App offers optional premium purchases that unlock additional features. Purchases and subscriptions are managed through Apple's App Store and RevenueCat, and are subject to Apple's terms and conditions.
Subscriptions, if any, automatically renew at the end of each billing period unless canceled at least 24 hours before the renewal date.
You can manage or cancel your subscription at any time through Settings → [Your Name] → Subscriptions on your iPhone.
All purchases are processed by Apple. Refund requests must be submitted directly to Apple via https://reportaproblem.apple.com/. We do not process refunds directly.
We reserve the right to modify which features are available under any tier at any time, including the free tier and any premium tier.
As a user, you agree to the following:
Lawful use: You agree to use the App only for lawful purposes and in compliance with all applicable laws, including laws on recording audio and video. You are solely responsible for obtaining any consent required to record audio or video of people, premises, or events.
Non-commercial use: The App is intended for personal, non-commercial use only. You may not resell, sublicense, or commercially redistribute measurements, exports, or reports generated by the App as a standalone product or service.
Prohibited activities: You agree not to reverse engineer, decompile, or disassemble the App; attempt to circumvent subscription checks or entitlement gates; use automated systems, bots, or scripts to interact with the App; or engage in any activity that disrupts the App's operation or infrastructure.
Intellectual property: You agree not to copy, distribute, modify, or create derivative works from the App's content, code, design, or branding without express written permission from the App owner.
The App integrates with third-party services including Apple's App Store and RevenueCat. You agree that:
We are not responsible for the availability, performance, accuracy, or data practices of any third-party service.
Third-party services may be changed, discontinued, or altered at any time, potentially affecting App features.
Your use of any third-party service is subject to that service's own terms and privacy policies.
The App is provided "as is" and "as available" without any warranty, express or implied, including but not limited to warranties of merchantability, fitness for a particular purpose, accuracy, or non-infringement. We do not guarantee that the App will be error-free, uninterrupted, or secure, or that any sound level, frequency, spectrogram, dose, time-weighted average, or other reading produced by the App will be accurate or suitable for any specific purpose, including regulatory, medical, legal, or workplace safety purposes.
To the fullest extent permitted by applicable law, Ertuğrul Sarı shall not be liable for any direct, indirect, special, incidental, consequential, or exemplary damages arising from your use of or inability to use the App. This includes but is not limited to:
Hearing damage, occupational injury, regulatory penalties, or workplace consequences resulting from reliance on readings generated by the App.
Decisions about hearing protection, exposure limits, equipment selection, or workplace safety made on the basis of App output.
Inaccurate spectral, level, dose, or time-weighted-average readings caused by device variability, microphone limitations, calibration errors, environmental factors, or software defects.
Loss of recordings, exports, calibration values, session metadata, or preferences.
Issues with subscriptions or payments processed through Apple.
Failures, downtime, or data loss caused by RevenueCat or any other third-party service.
Any decision you make based on the App's features or output is done entirely at your own risk. We are not responsible for any errors, inaccuracies, or consequences that result from using the App.
All rights, title, and interest in the App (including its design, code, graphics, algorithms, and branding) remain the sole property of Ertuğrul Sarı and are protected by applicable intellectual property laws. You are granted a non-exclusive, non-transferable, revocable license to use the App for personal use only. This license does not grant you any rights to copy, distribute, or modify the App's content or assets without express permission.
We reserve the right to update, modify, or discontinue the App or any of its features at any time, with or without notice. We are not liable for any modification, suspension, or discontinuation of the App. In the event of discontinuation, unused subscription periods will be subject to Apple's refund policies.
We reserve the right to terminate or suspend your access to the App at any time if we have reason to believe you are in violation of these Terms. Termination does not entitle you to refunds unless required by Apple's policies or applicable law.
By using the App, you also agree to our Privacy Policy, which explains how we handle data and third-party integrations. The Privacy Policy is accessible within the App and on our official website.
The following terms apply to your use of the App on Apple devices and are required by Apple's Developer Program License Agreement:
This Terms of Use agreement is concluded between you and Ertuğrul Sarı only, and not with Apple Inc. ("Apple"). Apple is not responsible for the App or its content.
Your license to use the App is limited to a non-transferable license to use the App on any Apple-branded device that you own or control, in accordance with the Apple Media Services Terms and Conditions.
Ertuğrul Sarı, and not Apple, is solely responsible for providing any maintenance and support services for the App.
In the event of any failure of the App to conform to any applicable warranty, you may notify Apple, and Apple will refund the App's purchase price (if any) to you. To the maximum extent permitted by applicable law, Apple will have no other warranty obligation whatsoever with respect to the App. Any other claims, losses, liabilities, damages, costs, or expenses attributable to any failure to conform to any warranty are the sole responsibility of Ertuğrul Sarı.
Ertuğrul Sarı, and not Apple, is responsible for addressing any claims relating to the App, including product liability claims, claims that the App fails to conform to any applicable legal or regulatory requirement, and claims arising under consumer-protection, privacy, or similar legislation.
In the event that any third party claims that the App or your possession and use of the App infringes that third party's intellectual property rights, Ertuğrul Sarı, and not Apple, will be solely responsible for the investigation, defense, settlement, and discharge of any such intellectual property infringement claim.
You represent and warrant that you are not located in a country that is subject to a U.S. Government embargo, or that has been designated by the U.S. Government as a "terrorist supporting" country, and that you are not listed on any U.S. Government list of prohibited or restricted parties.
Apple and Apple's subsidiaries are third-party beneficiaries of this Terms of Use agreement, and upon your acceptance of these Terms, Apple will have the right (and will be deemed to have accepted the right) to enforce this agreement against you as a third-party beneficiary thereof.
Any disputes arising in connection with these Terms will be subject to mediation or arbitration as per the laws of Turkey. These Terms are governed by the laws of Turkey, and any unresolved disputes will be subject to the exclusive jurisdiction of the competent courts in Turkey. Users may have additional rights under applicable local laws, including the GDPR in the EU, the CCPA in California, the KVKK in Turkey, or other regional laws.
We may update or modify these Terms at any time. Any changes will be reflected by an updated "Last Updated" date at the top of this document. Your continued use of the App after changes constitutes your agreement to the updated Terms.
If you have any questions or concerns about these Terms of Use, please contact us at:
Email: estifieapps@gmail.com