Privacy Policy

1. Zero-Knowledge Client-Side Computation (Deterministic Math Isolation)

The foundational engineering principle of Homecalpro is complete local execution. Every calculation across our 126+ specialized modules—including concrete yardage, loan amortization schedules, payroll net pay, drywall square footage, compound interest growth, and sleep cycles—is computed strictly by deterministic TypeScript running locally in your browser's V8 or JavaScript runtime environment.

• No Server Transmission of Calculation Inputs: When you type a $650,000 mortgage loan balance, an annual salary, or personal room dimensions, that numerical data is processed purely in client-side RAM. No HTTP POST requests, WebSocket packets, or background telemetry streams transmit your parameters to Homecalpro servers or any cloud database.
• No Runtime Generative AI or LLM Intermediaries: Homecalpro never routes user inputs to third-party artificial intelligence APIs, generative language models, or external neural networks at runtime. Arithmetic is solved deterministically through hard-coded algebraic equations, preventing any leakage of your financial, architectural, or personal parameters into machine learning training corpuses.
• Offline Resiliency: Once loaded, our calculation engines execute calculations independently of whether your network connection is active or severed.

2. Browser Storage & Local Persistence (`localStorage`)

To deliver an efficient, frictionless user experience without forcing user account registration, Homecalpro utilizes your browser's native client storage mechanisms (specifically window.localStorage):

• Visual Theme Preferences: Storing your preference between Day (Light) and Night (Dark) mode (theme: 'light' | 'dark').
• Saved Calculation Workspaces: If you explicitly click "Save Calculation" or "Bookmark Tool," the snapshot parameters are serialized as a JSON string within your browser's local sandbox.
• Recent Blog Category & Timeline Filters: Saving your active chronological filter states (such as Year and Month sorting preferences) for seamless navigation across sessions.

User Control: Data stored in localStorage remains exclusively on your physical machine. Homecalpro cannot access or inspect this storage remotely. You can permanently erase all stored keys at any moment through your browser's developer tools or by executing "Clear Browsing Data / Site Data."

3. Google AdSense, Cookies & Advertising Compliance

Homecalpro partners with Google AdSense to display non-intrusive advertisements that fund the continuous research, server hosting, and engineering maintenance of our free universal calculator hub. Google and its certified advertising partners operate as third-party vendors on our site in strict compliance with the official Google AdSense Program Policies and Google Publisher Policies.

A. Use of Advertising Cookies & Identifiers

Google uses cookies, web beacons, and mobile device advertising identifiers to serve ads based on your prior visits to Homecalpro and other websites across the Internet. For complete details on how Google deploys advertising technologies, consult How Google Uses Cookies in Advertising and How Google Uses Information from Sites or Apps That Use Our Services. These identifiers allow Google and its ad network partners to evaluate ad performance, prevent invalid traffic/fraud, and serve contextually relevant advertisements.

B. Google Consent Mode v2 & IAB Europe TCF v2.2 Compliance

We strictly enforce the Google Certified Consent Management Platform (CMP) standard and abide by the Google EU User Consent Policy. For visitors in the European Economic Area (EEA), United Kingdom, and Switzerland:

• Explicit Granular Consent: No advertising cookies, personalization signals, or non-essential tracking scripts execute until you provide explicit affirmative consent via our interactive CMP modal.
• Consent Mode Signals: Our platform dynamically broadcasts Google Consent Mode v2 signals (ad_storage, ad_user_data, ad_personalization, and analytics_storage). If consent is rejected, Google tags operate in restricted, cookieless ping mode without storing personal identifiers.
• Right to Revoke: You can modify or withdraw your consent at any time via the consent settings link in our site footer.

C. Opting Out of Targeted Advertising

Users globally can inspect and control how third-party advertising cookies are deployed on their devices:

• Google My Ad Center & Ad Settings: Customize or disable personalized Google ads at Google My Ad Center and Google Ads Settings.
• Google Publisher & Partner Disclosures: Review official documentation on How Google uses information from sites that use our services and the Google Publisher Policy Directory.
• Digital Advertising Alliance (DAA): Opt out of participating multi-vendor tracking cookies via AboutAds Consumer Choices.
• Network Advertising Initiative (NAI): Manage network opt-outs at NAI Opt-Out Tool.
• European Interactive Digital Advertising Alliance (EDAA): EEA users can manage advertising preferences via Your Online Choices.

4. Standard Web Server Log Files & Operational Telemetry

Like virtually all commercial web properties hosted on secure edge infrastructure (including Cloudflare), Homecalpro automatically records standard, non-personally identifiable server access logs. These records are collected solely for infrastructure integrity, DDoS mitigation, and edge routing optimization:

• Internet Protocol (IP) addresses (truncated and anonymized for geographic edge caching).
• Browser user-agent string, operating system architecture, and verified search engine indexers (such as Googlebot, operating in accordance with Google Search Central Crawler Documentation).
• Uniform Resource Identifier (URI) requested, HTTP response status code, and referer URL.
• Timestamp of the edge request and volume of bytes transferred.

Log file records are never cross-referenced with calculation data, never merged into identifiable consumer profiles, and are automatically purged in accordance with standard edge retention policies (typically within 30 to 90 days).

5. CCPA & California Privacy Rights (CPRA Notice)

Under the California Consumer Privacy Act (CCPA) as amended by the California Privacy Rights Act (CPRA), California residents are afforded specific statutory rights regarding their personal information:

• Right to Know & Access: You have the right to request disclosure of the categories and specific pieces of personal information collected, sources of collection, business purposes, and third parties with whom data was shared over the preceding 12 months.
• Right to Deletion: You have the right to request the deletion of any personal information collected from you, subject to legal compliance exceptions.
• Right to Opt-Out of Sale or Sharing: Homecalpro does not sell, rent, or monetize personal information for financial compensation. Where third-party advertising cookies are construed as a "sale" or "sharing" under California law, you may utilize the "Do Not Sell or Share My Personal Information" link in our footer or signal your preference through the Global Privacy Control (GPC).
• Non-Discrimination: We will never discriminate against you, diminish calculator accuracy, or restrict tool access because you exercised your statutory CCPA rights.

6. GDPR & UK Data Protection Rights (EU/UK Residents)

For individuals residing within the European Economic Area (EEA) and the United Kingdom, data processing conforms to the General Data Protection Regulation (Regulation (EU) 2016/679) and the UK Data Protection Act 2018. The legal basis for processing essential server logs is our legitimate interest in maintaining site security (Article 6(1)(f) GDPR); for advertising cookies and analytics, the legal basis is explicit consent (Article 6(1)(a) GDPR).

EU and UK users possess the following statutory rights:

• Right of Access (Article 15): Obtain confirmation of whether your data is processed and request certified copies.
• Right to Rectification (Article 16): Request correction of inaccurate or incomplete personal records.
• Right to Erasure ("Right to be Forgotten", Article 17): Request deletion of personal records under statutory conditions.
• Right to Restrict Processing (Article 18): Restrict active processing while disputes or verification are resolved.
• Right to Data Portability (Article 20): Receive your personal data in a structured, machine-readable format.
• Right to Object (Article 21): Object to processing based on legitimate interests or direct marketing.

To exercise any GDPR right, contact the Homecalpro Data Protection Liaison via our Contact Portal. We respond to verified statutory requests within thirty (30) calendar days.

7. Global Privacy Control (GPC) & Browser Signals

Homecalpro respects the Global Privacy Control (GPC) browser specification. When your browser transmits a valid GPC signal, our client-side systems automatically interpret this as an affirmative opt-out request under the CCPA/CPRA and applicable state privacy statutes, preventing the activation of non-essential third-party advertising cookies.

8. Protection of Children's Online Privacy (COPPA & Age Restrictions)

Protecting the safety of children online is of paramount importance. Homecalpro is designed as a general-audience educational and computational resource and does not target or knowingly collect personally identifiable information from children under the age of 13 (or under 16 in applicable European jurisdictions) in compliance with the Children's Online Privacy Protection Act (COPPA). If a parent or guardian believes that a minor has submitted personal contact information through our contact form, please notify us immediately so that we can expeditiously purge such records.

9. Third-Party External Hyperlinks

Homecalpro may contain hyperlinks to external reference repositories, government building code portals (e.g., ICC), financial institutions (e.g., Federal Reserve), standards boards (e.g., NIST, ASTM), or retail material suppliers. Homecalpro holds no control over the privacy practices, content, or cookie policies of third-party websites. We encourage you to inspect the privacy notices of any external site you choose to visit.

10. Policy Amendments & Institutional Governance

The Homecalpro Engineering & Standards Board periodically reviews this Privacy Policy to ensure continuing alignment with evolving international privacy regulations, advertising network specifications, and web browser security enhancements. Any revisions will be published on this page with an updated "Last Updated" timestamp. Continued use of our universal calculator platform following the publication of amendments constitutes acceptance of the revised terms.