Free tools

Five calculators that run in the browser. Each reproduces its workbook's verified figures; the workbook is the upsell, the tool is free.

No sign-up, no upload

Everything runs in your browser. Nothing you type leaves the page.

Same numbers as the workbook

Each tool is checked against the same worked cases as the Excel file it comes from.

The rule shown, not just the result

Each output names the article or method it applies.

One paid key

The AI Act classifier takes a $19 licence key for unlimited systems and CSV export; the other four have no paid tier.

All tools

EU AI Act classifier

Answer the questions and get the risk class, the obligation set, the date it applies and the fine ceiling under Regulation (EU) 2024/1689. Free for one system; a $19 key unlocks unlimited systems and CSV export.

UAE Corporate Tax calculator

Small Business Relief, the 0% band, QFZP and the interest cap, reproducing the workbook's verified cases.

CBAM cost estimator

Certificate cost per import line for 2026 to 2034 with the free-allocation phase-out.

Cap table calculator

SAFE and convertible note conversion, option pool top-up, dilution, exit waterfall.

Runway calculator

Cash-out date, break-even and scenarios from a headcount plan.

New workbooks and updates by email

One email when a new workbook ships or a regulation changes a template. No filler. Sent through Gumroad, unsubscribe in one click.

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