🗺️ Visual Navigation

HTML Site Map & Directory

A comprehensive, human-readable directory of all 22 client-side financial decision engines, developer productivity utilities, author profiles, and technical colophons.

⚡ 22 Interactive Tools 💰 16 Financial Engines 🛠️ 6 Developer Utilities 🔒 100% In-Browser Privacy

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Core Platform Pages

Home (Overview & Dual FAQs)

The primary landing page featuring top utilities, philosophy manifesto, and 31 side-by-side financial and developer FAQs.

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Services & Tools Catalog

Master directory of all 22 tools with live instant search and filter tabs for All (22), Finance (16), and Developer (6).

/services/

About JustOnlyOneThing

Platform engineering manifesto, privacy architecture, developer background story, and open web standards philosophy.

/about/

Author Profile: Saurabh Passolia

Full-stack software engineer and creator profile with technical credentials, engineering bio, and catalog of work.

/authors/saurabh-passolia/

Blog & Technical Journal

In-depth engineering essays exploring the intersection of algorithmic programming, compounding math, and financial autonomy.

/blog/

The Symmetry of Code and Capital

Featured editorial on why compounding interest is exponential scaling and why developers need deterministic financial models.

/blog/why-developers-need-financial-discipline/

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Financial Calculators & Decision Engines (16)

🏠 Real Estate & Mortgage Decision Engines

Rent vs Own House Calculator

Comprehensive 30-year unrecoverable cost evaluation comparing buying against renting while investing down payments in equity SIPs.

/services/rent-vs-buy/

Loan EMI & Amortization Calculator

Calculates exact monthly loan payments, principal vs interest splits, and year-by-year amortization schedules.

/services/emi-calculator/

Home Loan Eligibility Calculator

Estimates maximum borrowing capacity based on monthly income, existing loan commitments, and bank FOIR guidelines.

/services/home-loan-eligibility/

Interest-Free Home Loan Strategy

Calculates the parallel monthly equity SIP contribution needed so compounding market gains recover 100% of mortgage interest.

/services/interest-free-home-loan/

Rental Yield & Income Calculator

Computes gross and net property rental yields after accounting for taxes, maintenance fees, and vacancy periods.

/services/rental-yield/

💰 Wealth Building & Compounding Engines

SIP Wealth Calculator

Simulate disciplined mutual fund growth, compound returns, and annual step-up contribution increments over time.

/services/sip-calculator/

SWP Retirement Calculator

Plans systematic cash withdrawals from retirement portfolios while modeling ongoing growth on remaining capital.

/services/swp-calculator/

Compound Interest Calculator

Projects future investment value with custom compounding frequencies (monthly, quarterly, annually) and ongoing contributions.

/services/compounding-calculator/

CAGR Calculator

Measures the true smoothed Compound Annual Growth Rate of multi-year equity, bond, and real estate investments.

/services/cagr-calculator/

Simple Interest Calculator

Computes linear interest accruals, total repayment amounts, and compares linear returns against compound interest.

/services/simple-interest-calculator/

Net Worth & Balance Sheet Calculator

Calculates total personal net worth by summing liquid, physical, and retirement assets minus short and long term liabilities.

/services/net-worth-calculator/

💼 Business Finance, Margins & Runway

Startup Burn Rate & Runway Calculator

Calculates gross burn, net burn, and exact survival runway in months based on cash balance and operating cash burn.

/services/startup-burn-rate/

Break-Even Point Calculator

Determines unit sales and total revenue required to cover fixed overhead expenses and achieve operational profitability.

/services/break-even-calculator/

Profit Margin & Cost Markup Calculator

Computes gross profit margin, operating margin (EBIT), net margin, and markup percentages from revenue and COGS.

/services/profit-margin-calculator/

Working Capital & Liquidity Calculator

Calculates net working capital, current ratio, and quick ratio to assess short-term operational financial stability.

/services/working-capital-calculator/

DSCR Lending & Debt Coverage Calculator

Computes Debt Service Coverage Ratio (Net Operating Income / Annual Debt Service) to verify commercial debt sustainability.

/services/dscr-calculator/

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Developer Productivity Utilities (6)

Dual-Pane JSON Editor, Formatter & Diff

Format, minify, repair, tree-inspect, diff, query with JavaScript, and convert JSON documents to CSV in browser memory.

/services/json-editor/

Base64 & Base64URL Encoder/Decoder

Convert UTF-8 text, binary files, and JWT token segments to/from standard Base64 and URL-safe Base64URL formats.

/services/base64-encoder-decoder/

RegEx Tester & Match Explainer

Test regular expressions with instant capture group breakdown, regex cheat sheet, and code generator for JS, Python, Go, and Java.

/services/regex-validator/

JWT Token Inspector & Debugger

Decodes JSON Web Tokens without network requests and verifies HMAC-SHA256 signatures client-side using Web Crypto.

/services/jwt-token-inspector/

Cron Expression Parser & Scheduler

Parses 5-field UNIX and 6-field Quartz cron expressions into plain English schedules and calculates the next 10 execution times.

/services/cron-expression-parser/

Hash & Cipher Generator Suite

Generates MD5, SHA-1, SHA-256, SHA-512 hashes, HMAC signatures, identifies unknown hashes, and encrypts with AES-256-GCM.

/services/hash-cipher-generator/

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