Every tool here is a single HTML page that runs entirely in your browser
— no accounts, no backend, and nothing you enter leaves your device. The
one exception is opt-in: AI-assisted features call Anthropic directly
with your own API key, only when you use them. The flagship, Taigan
Bridge, is meant to be downloaded and opened locally; the copy hosted
here is a guided demo loaded with sample data.
Financial, tax, estate, and health planning for Americans on the opposite shore.
Sixteen bilingual EN/JP modules — net worth, FBAR, tax coordination, retirement projections, estate, property, family, healthcare, and more — behind a short branching onboarding so the dashboard only shows what applies to your household. Local-only: your data lives in your browser, no accounts, no telemetry. The copy hosted here is a guided demo pre-loaded with a sample household; download the single HTML file for real use.
Track FinCEN 114 filings year by year, with Treasury rates built in.
Planned standalone version of Taigan Bridge’s FBAR module: a year-by-year filing tracker using official Treasury year-end exchange rates, multi-filer households, and passbook/statement import.
Coming soon
Furusato Nozei (US Persons)
Hometown tax, with the US-person angle accounted for.
Planned: donation-limit estimation that also surfaces the US-side questions a hometown-tax donation raises for US persons.
Coming soon
Nenkin Projection
Project your Japanese pension from your record.
Planned standalone version of Taigan Bridge’s pension tooling: 国民年金/厚生年金 vesting, gap years, and how a US Social Security record fits alongside. Reads your 年金定期便.
Coming soon
Payslip Decoder
Understand every line of a Japanese payslip.
Planned: paste or photograph a Japanese payslip and get every line — earnings, deductions, social insurance — explained in plain English.