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VSTSABest Engineering Calculators Suite
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Terms of Service

VSTSABest Service Terms.

These Terms of Service govern your individual license to use VSTSABest — a one‑time purchase, offline‑capable engineering calculator suite. Please read them carefully before using the app.

Last updated: November 2025 Applies to: VSTSABest for personal and professional use
Summary (not a substitute for the full terms)

VSTSABest is licensed to you as a one‑time purchase. You may use it for engineering calculations, teaching, and internal business purposes, but you may not resell the app or its outputs as a hosted service. All calculations run locally on your device.

  • One-time license per purchaser or organization.
  • No subscriptions, no ads, no forced cloud storage.
  • You remain responsible for validating results against your own standards and requirements.
  • Liability is limited to the maximum extent permitted by law.

1. Acceptance of Terms

By downloading, installing, or using VSTSABest, you agree to be bound by these Terms of Service and any additional terms referenced herein. If you do not agree, you must not use the app.

2. License Grant

Subject to your compliance with these terms, we grant you a limited, non‑exclusive, non‑transferable license to install and use VSTSABest on your personal devices, or on devices owned or controlled by your organization, solely for engineering, educational, and internal business purposes.

The license does not permit you to resell, rent, or sublicense VSTSABest, or to operate it as a publicly accessible hosted service. You may, however, incorporate calculation outputs into your own reports, documentation, and teaching materials.

3. Acceptable Use

You agree not to reverse engineer, decompile, or otherwise attempt to access the source code, except where such restrictions are prohibited by law. You may not circumvent technical limitations, remove copyright or attribution notices, or use VSTSABest in a manner that violates applicable laws or regulations.

You remain solely responsible for how you apply results obtained from VSTSABest in real‑world projects and for ensuring that all engineering decisions satisfy your organization's safety, regulatory, and quality standards.

4. Calculation Results and No Warranty

VSTSABest uses verified industry‑standard formulas with documented assumptions, but it is ultimately a support tool. It does not replace professional judgment, peer review, or regulatory approval. All results should be cross‑checked against your own design criteria and, where appropriate, independent calculations or simulations.

VSTSABest is provided "as is" and "as available," without any express or implied warranties, including but not limited to warranties of accuracy, fitness for a particular purpose, or non‑infringement. To the maximum extent permitted by law, we do not guarantee that the app will be free from errors, defects, or interruptions.

5. Limitation of Liability

To the fullest extent permitted by applicable law, we shall not be liable for any indirect, incidental, special, consequential, or punitive damages, or for any loss of profits, revenue, data, or use, arising out of or in connection with your use of VSTSABest.

Where liability cannot be excluded, our aggregate liability arising from or relating to your use of VSTSABest shall be limited to the amount you actually paid for your license to the app.

6. Data Storage and Privacy

VSTSABest is designed to operate offline. Calculation inputs, history, and favorites are stored locally on your device and are not transmitted to our servers by default. Please refer to the Privacy Policy for details on how we handle any optional feedback or diagnostic information you may choose to share with us.

7. Updates and Changes

We may release updates that improve performance, add calculators, or refine existing functionality. Where platform policies allow, updates will be available as part of your one‑time purchase. We may also update these Terms from time to time; the "Last updated" date above indicates when they were most recently revised.

8. Termination

We may suspend or terminate your license if you materially breach these Terms. Upon termination, you must cease using VSTSABest and remove it from your devices. Sections relating to intellectual property, disclaimers, and limitations of liability survive termination.

9. Contact and Legal Notices

If you have any questions about these Terms, or if you need to provide formal legal notice, you can contact us at:

Email (general support): [email protected]
Email (legal): [email protected]

Key concepts at a glance

VSTSABest is sold as a one‑time license. You own a license to use the app; we retain intellectual property rights in the software and its design.

  • Local‑first storage and calculations.
  • No subscriptions or advertising networks embedded.
  • Designed to complement, not replace, engineering judgment.
Jurisdiction & enforcement

These Terms may be governed by the laws of your country or region, subject to applicable consumer protection and platform rules. In case of conflict between these Terms and mandatory local law, the latter will prevail.

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Precise, documented engineering calculators for oil & gas, aerospace, optics, and electronics.

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