Mortgage calculator widget for sites — payments, early repayment, leads
White-label mortgage calculator widget for realtor, broker, developer or bank websites: one script tag — a live calculator in your brand that generates leads.
Zero dependencies. Shadow DOM — your site styles never clash with the widget. Light and dark themes, brand color via attribute. A phone field after calculation sends the lead to your webhook (CRM, n8n, TG-bot via backend).
📦 FORMAT · VERSION · GUARANTEE
• Contents: ZIP — mortgage-widget.js (widget + math core), demo.html, React wrapper MortgageWidgetReact.jsx, Excel workbook with live formulas, tests/, docs/THEMING.md, GUIDE.pdf, README, LICENSE (white-label allowed)
• Version: September 2026
• Requirements: any website (vanilla, WordPress, Tilda HTML block, Next.js) — no build step, no deps
• Delivery: automatic e-mail right after payment
• Guarantee: reproducible bugs fixed in 24–72h (6 months of support)
WHAT THE WIDGET DOES
• Annuity payment by S·i·(1+i)^n/((1+i)^n−1) — monthly payment card
• Comparison with differentiated payments: first/last payment and scheme saving
• Full amortization schedule with dates: payment, interest, principal, balance
• Early repayment in both modes (reduce payment / reduce term)
• Open MortgageMath core: insurance, 2026 tax deduction (2M/3M caps), family-mortgage check — 12 automated tests
HOW TO EMBED (2 minutes)
All" class="spanlink">https://your.api/lead">
All parameters optional. React/Next.js — ready component included.
LEADSAfter calculation a phone field appears → POST JSON to your endpoint: {phone, page, S, rate, months, at}. Sent with no-cors — works with any receiver, network errors never break the widget. docs/THEMING.md has a 5-line PHP receiver and an n8n variant.
EXCEL WORKBOOK FOR ANALYTICSLive formulas (not pictures): 360-month schedules, a Comparison sheet (annuity vs differentiated), early-repayment simulator, tax deduction with caps. Recalculated with the formulas engine and verified against an independent computation — figures match the widget to the kopeck.
QUALITYnode --test tests/math.test.js — 12 checks: payment formula, schedule sums = loan + interest, monotonic balance decay, early repayment correctness, deduction caps. The widget was exercised in a browser on a live demo page (screenshots are the real UI).
FOR WHOM• Realtors and brokers — keep visitors and collect leads on your own site
• Developers and banks — a branded calculator without custom development
• Web studios — offer embedding as a service
SEE ALSO: offline mortgage calculator for personal use; PHP SaaS Starter Kit for subscription platforms.
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