Frequently Asked Questions

Yes, 100% free. There are no hidden fees, no signup walls, no premium tiers, no credit card requirements. Every tool, calculator, and article is accessible to everyone at no cost. We support the site through non-intrusive advertising placed outside the tool interface, never inside it.

No account is needed. You can use every tool anonymously, instantly. We do not collect your name, email, or any personal information when you use a calculator or converter.

We make significant effort to ensure accuracy. Each tool uses formulas and methodologies from authoritative sources (official documentation, peer-reviewed research, government publications). Where applicable, we cite the source on the tool page itself. However, no calculator is perfect — always verify critical results with a professional.

No. Most of our tools run entirely in your browser using JavaScript. The numbers, text, or files you enter never leave your device. We do not log, store, or transmit your inputs.

We review every tool at least once per year for accuracy and clarity. Tax calculators and currency converters may be updated more frequently to reflect regulatory or rate changes. Each tool and article page displays a "Last updated" date.

Absolutely — we welcome suggestions. Use our contact form or email us at contact@ht99.icu. We cannot guarantee every suggestion will be built, but we read every one and prioritize based on demand and our editorial roadmap.

Please report it immediately via our contact form or by emailing contact@ht99.icu. Include the tool URL, your inputs, and what you expected vs what you saw. We will investigate within 1–2 business days and fix confirmed bugs within 24 hours, crediting you on the page if you wish.

No. Our financial tools (loan, EMI, mortgage, retirement, ROI, etc.) are educational estimators. They use simplified formulas and standard assumptions. They do not account for fees, taxes, regulatory specifics, or your personal financial situation. Always consult a licensed financial advisor before making important financial decisions.

No. Our health and fitness calculators (BMI, BMR, body fat, calorie, pregnancy, etc.) are based on standard formulas and statistical averages. They are not a substitute for evaluation by a qualified healthcare provider. Always consult a physician before making decisions about your health, diet, or treatment.

Yes, we use essential cookies (for site security and your cookie preference) and, with your consent, analytics and advertising cookies. You can decline non-essential cookies at any time via the consent banner or your browser settings. See our full Cookie Policy for details.

Yes. Our entire site is mobile-responsive and touch-friendly. Every tool works on phones, tablets, and desktops. Mobile-first design is a core principle — we test on real devices, not just desktop browsers.

Not currently. Our tools are designed for human use through the website. If you need programmatic access for a specific use case, contact us and we may consider building it.

Not currently. Our tools are designed to be used on our domain. If you have a use case for embedding, please reach out via our contact form.

We display non-intrusive advertisements outside the tool area (typically in the sidebar or below the FAQ). We never place ads inside the tool interface, above the fold, or as intrusive pop-ups. We do not sell user data. We may add affiliate links in the future, always with clear disclosure.

Currently the site is in English only. We plan to add additional languages in the future based on demand.

HT99 Tools is run by a small editorial team of engineers, finance enthusiasts, and writers. See our About page for more details about the team, our mission, and our editorial standards.

You can reach us via our contact form at /contact.php or by emailing contact@ht99.icu. We respond to all messages within 1–2 business days.