Homeowners get bombarded with refinance spam mail showing misleadingly low payments (excluding taxes, insurance, closing costs) and can't easily determine if refinancing, recasting, or staying put is the best financial move.
User inputs current loan details (balance, rate, term remaining, taxes, insurance) and the tool models refinance vs recast vs status quo scenarios with real closing costs, break-even timelines, and total interest paid over the life of the loan. Connects to current rate APIs for live comparisons.
Freemium: free basic comparison, paid tier ($5-10/month or $29 one-time) for rate monitoring alerts, lender matching, and detailed amortization scenarios. Affiliate revenue from lender referrals.
The pain is real but episodic. Homeowners feel it acutely when they get spam mailers or when rates move, but it's not a daily problem. The Reddit thread shows genuine confusion about refi vs recast vs staying put, and frustration with misleading mailer claims. However, most people make this decision once every 3-7 years, limiting urgency.
TAM is enormous. ~50M U.S. mortgages, roughly 10-15M homeowners actively considering refinancing in any rate-shift period. Even capturing 0.1% = 10-50K users. The addressable market for a tool like this is realistically $50-200M when you include affiliate revenue potential. Mortgage is one of the largest financial decisions people make.
This is the weakest link. Free calculators are everywhere. NerdWallet and Bankrate have trained consumers to expect this for free. The $5-10/month subscription is a tough sell for something used episodically. The $29 one-time fee is more realistic but still faces resistance when free alternatives exist. Real money is in affiliate/lender referrals, not direct consumer payments.
Very buildable as a solo dev MVP in 2-4 weeks. Core is math (amortization formulas, break-even calculations) plus a clean form UI. Rate APIs exist (Mortgage News Daily, Freddie Mac PMMS). No complex infrastructure needed. Could start as a static site with client-side calculations. The recast comparison is a genuine differentiator and trivial to implement.
The gap exists but it's narrow. The recast comparison angle is genuinely underserved — no major calculator includes it. The opinionated recommendation ('here's what you should actually do') is also missing. However, the core refinance calculator space is saturated with free tools from well-funded players. Your differentiation is real but not a moat.
Mortgage decisions are inherently episodic, not recurring. Rate monitoring alerts add some subscription justification, but users will cancel once they refinance or decide not to. The natural usage pattern is: use intensely for 2-4 weeks, then never again. This fights subscription economics. Affiliate revenue is the more natural recurring model (per-transaction, not per-user-per-month).
- +Genuine gap in recast vs refi vs status quo comparison — no existing tool does this well
- +High-intent audience that is actively making a major financial decision (high affiliate conversion potential)
- +Technically simple MVP with clear differentiation from day one
- +Large addressable market with cyclical demand spikes that are predictable
- +The opinionated advisor angle (telling users what to DO, not just showing numbers) is a real UX differentiator
- !Free calculator saturation from NerdWallet, Bankrate, Zillow makes user acquisition expensive via SEO
- !Willingness to pay directly is low — business viability depends heavily on affiliate/lender referral revenue which requires scale
- !Episodic usage pattern kills subscription retention; most users churn after making their decision
- !Mortgage affiliate programs have strict compliance requirements and can be difficult to get approved for as a small operator
- !Google could add this as a featured snippet / calculator and kill organic traffic overnight
Free online calculator that compares current mortgage vs refinance scenario, estimates monthly savings and break-even point. Part of a larger personal finance content site.
Simple refinance calculator showing monthly payment difference, total interest savings, and break-even timeline. Embedded in Bankrate's content ecosystem.
Detailed amortization calculator with extra payment scenarios, refinance comparison, and printable schedules. Long-standing independent tool.
Refinance and purchase calculator integrated into Zillow's property platform. Shows estimated payments with taxes and insurance included.
Comprehensive mortgage calculator suite including refinance, amortization, and affordability tools.
Single-page web app with three inputs: current loan details, potential refi terms (auto-populated from a rate API), and optional lump sum for recast. Output a clear, opinionated verdict: 'Refinance saves you $X over Y years' or 'Stay put — you'd need Z years to break even' or 'Recast is your best option — here's why.' Include a shareable results link. Skip the subscription entirely for MVP. Monetize with a single affiliate CTA: 'Ready to refinance? Get quotes from vetted lenders.' Launch on r/personalfinance and r/FirstTimeHomeBuyer.
Free tool with full functionality → build SEO traffic and Reddit/social distribution → monetize via mortgage lender affiliate referrals ($50-200 per qualified lead) → add premium rate alert emails as lightweight upsell ($29 one-time) → explore B2B licensing to financial advisors or credit unions → potentially white-label the calculator for mortgage brokers
4-8 weeks to MVP launch, 2-3 months to first affiliate revenue if you can get approved for mortgage affiliate programs (LendingTree, Bankrate partner network). Direct consumer payment revenue ($29 one-time) could come within 1-2 months but will be minimal. Realistic path to $1K/month affiliate revenue is 4-6 months with strong SEO and community distribution.
- “spam mail claims they can get me down to $1230/month which I know is excluding a bunch of taxes”
- “wondering if I'd be able to get under $1500 again, or if I'd be better off recasting instead of refinancing”
- “we need to know your current taxes and insurance monthly cost”
- “by the time you pay closing costs on a refi, your total cost will be close to a wash”
- “current rate has to be over 1.5 lower than your loan rate to make a refi worth it”