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Have questions, found a bug, or want to suggest a feature? We'd like to hear from you.

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Frequently Asked Questions

Are your calculators really free?

Yes, completely free for personal use. No ads, no subscriptions, no hidden fees. If you want to embed our calculators in your commercial product, contact us for licensing.

Do I need to create an account?

No. All calculators work without any signup or registration. Your data stays private in your browser.

How accurate are the calculations?

We run 1,000+ automated tests on every calculator to ensure accuracy. Our results are validated against independent Python implementations and match within $0.01 in most cases. See our methodology for details.

Can I save my calculations?

Currently, we don't offer saving functionality (to preserve your privacy). You can use the Export features to download your results as PDF, CSV, or Excel files for your records.

How do I report a bug?

Email bugs@thy.finance with:

• Which calculator you were using
• The input values you entered
• What result you got vs what you expected
• Screenshots if possible

We investigate all bug reports and usually respond within 24-48 hours.

Can you add a calculator for [X]?

We're always looking to expand our offerings. Send feature requests to features@thy.finance. We can't promise to build everything, but we do review all suggestions.

Do you provide financial advice?

No. thy.finance provides educational tools, not financial advice. Our calculators help you understand your options, but you should consult with qualified financial professionals before making major financial decisions. See our disclaimer.

Response Time

We aim to respond to all inquiries within 48 hours (business days). Bug reports affecting calculation accuracy get priority attention.

Note: We're a small team. During high-volume periods, responses may take longer. Thank you for your patience.

Last updated: October 2025