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WhooshingLander

I build things for the internet.

Indie developer shipping production-grade tools. Specializing in financial tech, clean APIs, and experiences that actually work.

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Live Products

22+

Options Strategies

ETFs Supported

01 / Featured Work

Shipped & Live

optionprofitcalculator.ai

LIVE

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Free options profit calculator with full Black-Scholes pricing engine. Visualize P&L curves, all five Greeks, breakeven prices, and Expected Move for 22+ strategies. No signup. No paywall. Just the tool.

◆Black-Scholes Pricing Engine

◆Full Greeks (Δ Γ Θ V ρ)

◆P&L Curve at Expiration

◆Probability of Profit

◆22+ Strategy Presets

◆Public REST API

Next.jsTypeScriptREST APIFinanceRapidAPI

directindex.club

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Direct Index Club — build your own ETF basket at 0% expense ratio. Wall Street charges 0.20–0.40%/yr for "direct indexing". This is the free version. Pick the top holdings of any ETF, see your R² correlation, fee savings over 30 years, and get exact buy amounts. No account. No signup.

◆ETF Basket Builder

◆R² Correlation Estimator

◆30-Year Fee Savings Calc

◆Exact Buy List Generator

◆6 ETF Presets (SPY, ITA…)

◆Privacy-first Analytics

Next.jsTypeScriptFinanceDirect IndexingVercel Analytics

SG Property Calc

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Singapore property loan calculator built for mobile and iPad. Covers TDSR, MSR, ABSD, BSD, HDB vs private property rules, live bank rate comparisons, cash shortfall analysis, and a plain-English summary at the end. No signup. No paywall.

◆TDSR & MSR Checks

◆BSD + ABSD Calculator

◆HDB & Private Rules

◆Bank Rate Comparison

◆Cash Shortfall Analysis

◆Plain-English Summary

Next.jsTypeScriptSingaporePropertyFinance

sgtenancy.com

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Singapore tenancy agreement generator for landlords and tenants. Fill a short form, get a legally-structured TA for HDB, private property, or room rental — free to preview, download from $10. Covers new agreements and renewals.

◆New TA Generator

◆Renewal Addendum

◆HDB & Private Property

◆Room Rental Support

◆Free Preview

◆PDF Download

Next.jsTypeScriptSingaporeLegal TechPDF

02 / About

Who I Am

I'm a builder. I make production-grade financial tools that are free, fast, and built for people who actually use them.

No VC money. No growth hacking. Just shipping things that work and putting them online. My philosophy: the best tools are the ones that stay out of your way.

I focus on fintech — options pricing, portfolio analysis, index replication. Areas where the existing tools are either paywalled, bloated, or both.

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