Declare the inputs
Separate user assumptions from public records so a changed result can be explained.
TOOOLBOX / PRACTICAL DECISION TOOLS
Tools for expensive decisions.
Compare housing, relocation, and weekend fishing options with the inputs, calculations, public evidence, and uncertainty kept visible.
- 3
- live tools
- 24
- worked analyses
Our tools
Focused tools. One decision at a time.
View all tools →Each workspace is paired with documentation explaining its inputs, outputs, data sources, method, and reliability boundary.
APTHousing
Apartment Cost Planner
Compare Korean apartment sale, jeonse, and monthly-rent transaction records with financing assumptions and management-cost context.
MOVERelocation
Relocation Cost Comparison
Compare salary, taxes, housing costs, non-housing spending, and long-term cash-flow scenarios before relocating in the United States.
FINVECTOROutdoors
Weekend Fishing Intelligence
Prioritize U.S. fishing waters with official stocking evidence, hydrology, weather, terrain, access, connectivity, and species habitat context.
Current tool network: APT + MOVE + FINVECTOR. Public evidence and user assumptions remain separate throughout the calculation.
Review the source register →Built around the decision
A result you can inspect and challenge.
Show the calculation
Expose intermediate arithmetic and model rules instead of asking readers to trust a score.
Keep the limits visible
Treat missing evidence as unknown and state what the tool cannot decide.
Worked decision notes
See the reasoning, not only the result.
Start with an observed APT result, a mortgage-balance comparison, a MOVE offer replay or a dated USGS record. Open each case to inspect assumptions, calculations and sources.
APT · CASE 01
From an ₩800M price to a monthly housing burden
A reproducible mortgage example that separates transaction evidence, financing assumptions, and costs the calculator cannot know.
Inputs · calculation · sensitivity · sourcesAPT · CASE 10The September 2026 fixed-rate term trade-off
A ₩300M loan stress test using HF's published September 2026 endpoint rates: 4.90% for 10 years and 5.20% for 50 years.
Inputs · calculation · sensitivity · sourcesMOVE · CASE 16Dallas to Seattle: where a $25K raise goes
A live MOVE replay traces a $25K raise through 2026 federal tax, employee FICA, rent and a visible spending assumption; change costs to test the result.
Inputs · calculation · sensitivity · sourcesFINVECTOR · CASE 20A 2.87-foot reading needs its timestamp
A dated USGS Little Falls snapshot is converted into an observation-age gate instead of being shown as an untimed condition claim.
Inputs · calculation · sensitivity · sourcesPublishing standard
Tools first. Claims still need boundaries.
Calculators are more useful when ownership, data sources, assumptions, limitations, and corrections remain visible.
TOOOLBOX Publisher
The owner and developer responsible for the TOOOLBOX calculation tools, data-source registry, worked examples, corrections, and publication decisions.
Reproduce before publishing
Published cases list AI-assisted arithmetic and source checks, explicit assumptions, sensitivity, and the limits of the result. A technical-check date does not imply a human fact-check.
No sponsored rankings
TOOOLBOX does not sell placement in its calculations or publish sponsored rankings disguised as tool results.
See what changed and why. The public review log records calculation checks, source changes, corrections, and pages intentionally withheld from search.
Open review log →