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The math the dealer skips.Free. No signup.

Calculators for the parts of a contract where the markup actually lives.

60 / 72 / 84 months, side by side

Auto loan true-cost calculator

Money factor → APR, plus the dealer markup

Car lease calculator with markup detection

3, 5, and 7-year holds, with retained equity

Lease vs buy total-cost calculator

Every hidden line item the listing leaves out

Rent true-cost calculator

Days late, statutory damages, the right next step

Security deposit refund calculator

CDW, airport tax, young driver, fuel, tolls

Car rental true-cost calculator

Per-pound rate, FMCSA 110% rule, packing add-ons

Moving cost estimator

Lease, cell, gym ETF with state mitigation cap

Early termination fee calculator

Insurance payout with depreciation line by line

ACV vs replacement cost calculator

The retroactive bill if you miss the deadline

CareCredit deferred interest calculator

Effective APR after origination, not the disclosed number

Personal loan true-cost calculator

The app

The contract is where the rest lives.

The calculators show the math. Redline reads the contract and flags hidden fees, mandatory arbitration, and the clauses that quietly change the deal's economics.

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