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STWLTH v1.0 · live build · privacy-first

Build wealth.
Stay quiet.

Your FIRE number in sixty seconds. No account linking. No spreadsheet homework. No noise. Financial simulators for people who'd rather compound than broadcast.

Account linking — your data stays yours Two-hour setup — answers in 60 seconds Ads for members — ever
Turn on airplane mode — the free calculators still work. Your numbers never leave your device.
LIVE
01 · INPUTSDRAG →
Monthly invest$1,500
Horizon30 yrs
Annual return8.0%
Starting balance$10,000
02 · PROJECTIONt+30Y
$2,344,896
ending balance · nominal
Contributed
$550K
Gains
$1.79M
Millionaire at
year 21
CAGR
8.00%
Chart · balance by year
Total balanceContrib only
YEAR 15
$552,127
§ 02 · TOOLKIT

19 simulators.
Each one does one thing well.

Scroll →
COMP·01FREE
Compound Growth Simulator

See how your investments grow over 40 years with compound interest, monthly contributions, and dividend projections.

No signupOpen
FIRE·01FREE
FIRE Number Calculator

Calculate your Financial Independence number based on your annual expenses and safe withdrawal rate.

No signupOpen
COAST·01FREE
Coast FIRE Calculator

Find out if you've hit Coast FIRE — the point where you can stop contributing and still retire on time.

No signupOpen
LIFE·01FREE
Lifestyle Inflation Detector

Quantify what raises you spent instead of invested. See the missed-savings dollar figure and how many years earlier you'd hit FIRE without lifestyle creep.

No signupOpen
NEG·01🔒 PREMIUM
Salary Negotiation Impact Simulator

See how a raise today becomes $500K+ over 20 years when invested. The tool that makes you negotiate.

Preview availableOpen
JOB·01🔒 PREMIUM
Job Offer Comparison Tool

Compare two job offers on true total compensation — salary, bonus, RSUs, 401k match, and benefits.

Preview availableOpen
RENT·01🔒 PREMIUM
Rent vs Buy Simulator

Honest math on renting + investing vs buying. Accounts for property tax, maintenance, and opportunity cost.

Preview availableOpen
OMY·01🔒 PREMIUM
"One More Year" Calculator

See the financial impact of working exactly one more year. Helps you decide when to pull the trigger on FIRE.

Preview availableOpen
ACA·01🔒 PREMIUM
ACA Bridge Planner

Plan health insurance for the years between early retirement and Medicare. Honest math on your ACA premium tax credit, the restored 400% FPL cliff, and how Roth conversions and capital gains move your net premium.

Preview availableOpen
ROTH·01🔒 PREMIUM
Roth Conversion Ladder

Plan year-by-year Roth conversions that fill your tax bracket, track the 5-year unlock schedule, and compare total tax against early withdrawals with the 10% penalty.

Preview availableOpen
DRAW·01🔒 PREMIUM
Withdrawal Order Optimizer

Which account do you drain first in retirement? Compare conventional, Roth-conversion-aware, and bracket-fill withdrawal sequences year-by-year — federal-tax-aware — and see the lifetime tax and ending portfolio for each.

Preview availableOpen
EQ·01🔒 PREMIUM
Equity Compensation Calculator

Sell your vested RSUs immediately, or hold for long-term capital gains? Honest math on the tax-timing question — including when the hold is a rounding error and concentration risk makes 'diversify anyway' the right answer.

Preview availableOpen
RISK·01🔒 PREMIUM
Sequence Risk Simulator

Monte Carlo survivability + bucket strategy for early retirement. Model how bad first-decade returns interact with your cash / bond / stock buckets and stress-test against 1929, 1966, 2000, and 2008.

Preview availableOpen
SS·01🔒 PREMIUM
Social Security Optimizer

What does retiring early actually do to your Social Security? Build a synthetic earnings history (nothing to paste, nothing stored), see the honest bend-point math on your $0 years, and compare claiming at 62 vs 67 vs 70 with break-even ages.

Preview availableOpen
MORT·01FREE
Mortgage Calculator

See your full mortgage breakdown — monthly payments, amortization schedule, total interest, and payoff timeline.

No signupOpen
DEBT·01FREE
DebtLOC Payoff Simulator

The honest simulator for HELOC / velocity banking strategies. Shows you when it actually helps, when it doesn't, and how small the real benefit typically is vs simple extra payments. Free verdict, premium depth.

No signupOpen
PAY·01FREE
Paycheck Allocation Optimizer

Answers the FIRE-community's first question: after your paycheck hits, which bucket do you fill first — 401(k) match, HSA, Roth IRA, Traditional 401(k), or brokerage? The honest math on after-tax value per $1,000 for your income and horizon.

No signupOpen
SIDE·01FREE
Side Income Impact Simulator

How much does a $500/mo side hustle actually accelerate your FIRE date? Models the after-tax stream (W-2 / 1099 / cash), how much you reinvest, and the honest per-hour trade-off if you enter weekly hours.

No signupOpen
TAX·01FREE
Tax Bracket Calculator

See your effective and marginal tax rates. Model how maxing your 401(k), HSA, and Traditional IRA changes your tax bill. Federal + FICA, 2024–2026.

No signupOpen
§ 03 · RECEIPTS

The green isn't your contributions.
It's your money making money.

One year of $1,500/month at 8% grows by ~$1,500. Thirty years later, the same $1,500 contribution is dwarfed by three decades of compounding. This is the whole game.

Simulators shipped
10
Free tools
8
Visualizations
12+
Data sold
$0
Compound · $1,500/mo · 8%30 YR HORIZON
0Y10Y20Y30Y$2.24M
ContributionsCompound gains
§ 04 · PRINCIPLES

Built different.
On purpose.

The quiet
wealth way

Privacy-first

Manual entry. No bank connections. No Plaid. No OAuth. Your data stays in your browser — we can't read it if we tried. And AI answers are opt-in, minimal, and never stored.

01 · NO PLAID

No noise

No ads. No affiliate links. No content marketing funnel. No newsletter asking you to 'compound your inbox.' Just tools that work.

02 · NO ADS

Made by builders

Built by a developer who uses these tools. We ship what we want to use. You benefit.

03 · DOGFOOD
§ 05 · PRICING

Three plans.
That's it.

No enterprise.
No comparison table.
FreeTier 01

Honest math on the decisions people actually ask about.

$0/forever
no credit card · no account
  • 8 free tools + free DebtLOC verdict
  • 1 saved scenario per tool
  • No sign-up required
  • Installable app — works offline
Start free
PremiumTier 02

Unlock all tools and save more scenarios.

$7.99/mo
or $69/yrSave 28%
  • All 19 tools
  • 10 saved scenarios per tool
  • Shareable scenario links
  • Salary, job offer, rent vs buy, and more
  • Advanced mode on more tools
  • Installable app — works offline
Start with Premium
UltimateTier 03

For serious FIRE planners. No limits.

$14.99/mo
or $129/yrSave 28%
  • All 19 tools
  • Unlimited saved scenarios
  • Shareable scenario links
  • PDF & CSV export
  • Advanced⁺ mode — enhanced settings & rate controls
  • Monthly net worth tracking with FIRE progress
  • Installable app — works offline
  • Priority support
Go Ultimate
$0 · START BUILDING

Your future
is doing the math_

Right now, in the background, compounding is making its decisions. Make yours.