Is Decidely completely free to use?

Yes, Decidely is 100% free forever. There are no subscriptions, no locked pro tiers, no credit card requirements, and no login gates. All 20+ calculators, amortization schedules, and comparison engines are fully accessible to everyone.

How does Decidely guarantee zero calculation errors or AI hallucinations?

Unlike generative AI language models that predict numbers probabilistically, Decidely executes pure deterministic client-side mathematics using standard financial equations (such as the standard amortization formula M = P[r(1+r)^n]/[(1+r)^n - 1] and compound interest formulas). Every formula, assumption, and worked example is published transparently.

What is the 20/4/10 rule for car affordability?

The 20/4/10 rule is a conservative personal finance guideline for buying a car: put at least 20% down, finance the vehicle for no longer than 4 years (48 months), and ensure total monthly vehicle expenses (loan payment, auto insurance, fuel/charging, and maintenance) do not exceed 10% of your gross monthly income.

How does Decidely compare renting versus buying a home?

Decidely's Rent vs. Buy Calculator runs a multi-year Net Present Value (NPV) projection that factors in home appreciation, mortgage interest, property taxes, insurance, routine maintenance (1% rule), and selling closing costs versus renting plus investing the down payment and monthly cash flow differences into a broad-market index fund.

What is the difference between the Debt Avalanche and Debt Snowball payoff strategies?

The Debt Avalanche method pays off debts in order of highest interest rate (APR) first, which mathematically minimizes total interest paid and results in the fastest debt freedom. The Debt Snowball method pays off debts in order of smallest balance first, which provides early psychological and behavioral wins.

How can I download and install Decidely on Android offline?

You can download the official Decidely Android v1.2 APK directly from https://decidely.site/download. The APK is 17.0 MB, cryptographically signed, requires Android 8.0+, runs 100% offline with zero data telemetry, and features all 22 verified financial calculators.

Does Decidely work without internet, cellular, or Wi-Fi?

Yes. Both the Decidely progressive web app and the standalone Android APK execute all financial mathematics completely client-side in your device runtime. You can calculate mortgages, auto loans, compound growth, and debt payoffs in airplane mode with 0ms calculation latency.

100% Free Deterministic Financial Tool

Calculate Rent vs Buy: Lifetime Net Worth

Compare the true long-term financial outcome of buying a home versus renting and investing the down payment difference.

• Verified Financial Math • Zero Telemetry / 100% Private • Instant Client-Side Computation

Interactive Rent vs Buy Calculator

Should I rent or buy a home?

              Ready to Compute
            

Enter your financial parameters below to generate an instant, 100% deterministic breakdown with sensitivity analysis and scenario comparison.

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Mathematical Formulation & Methodology

Decidely executes pure deterministic client-side mathematics. Unlike probabilistic AI models that guess numerical results, every calculation is calculated using standard financial accounting equations:

            Multi-year net wealth model comparing accumulated home equity (net of sales commissions & maintenance) against renter opportunity cost portfolio compounding.
          

Baseline Assumptions & Standards

Home appreciates at constant annual rate (default 3.5%)
Rent increases annually at rent inflation rate (default 3.0%)
Down payment and monthly cash flow differences are invested in the stock market (default 7.0%)
Includes 6% selling commission when liquidating the home

Worked Example: $450,000 Home vs $2,300/mo Rent over 10 Years

Deciding whether to stay a renter or purchase a townhouse.

Example Inputs

Home Price $450,000

Down Payment 20%

Monthly Rent $2,300

Stay Duration 10 Years

Calculated Output

Break-Even Year Year 4

Buyer Liquidated Equity $278,000

Renter Portfolio $232,000

Advantage Buy (+$46,000)

Key Financial Takeaway:

Under these assumptions, buying breaks even after 4 years and generates $46,000 more net wealth by year 10.

Frequently Asked Questions

Why is renting not "throwing money away"?

Renting buys shelter and flexibility without requiring non-recoverable costs like mortgage interest, property taxes, HOA fees, repairs, and closing friction. The money saved upfront can compound in index funds.

What is the break-even horizon?

The break-even horizon is the point in time where the equity gained from home ownership overcomes the high initial closing costs, ongoing maintenance, and mortgage interest compared to renting.

How long should I plan to stay in a home to justify buying?

Generally, buying makes financial sense if you plan to stay in the home for at least 5 to 7 years. Selling earlier often results in a net loss due to 6-8% in closing and realtor transaction costs.

Calculate Rent vs Buy: Lifetime Net Worth

Interactive Rent vs Buy Calculator

Mathematical Formulation & Methodology

Baseline Assumptions & Standards

Worked Example: $450,000 Home vs $2,300/mo Rent over 10 Years

Example Inputs

Calculated Output

Frequently Asked Questions

Why is renting not "throwing money away"?

What is the break-even horizon?

How long should I plan to stay in a home to justify buying?

Related Decision Tools & Calculators

Mortgage Calculator →

Home Affordability Calculator →

Down Payment Calculator →

Investment Calculator →