Keep the tools free. Fuel what comes next.

Every calculator here is free and ad-supported. Your support goes further: it funds research, translations into Chinese, Hindi and Arabic, monthly contest prizes and new hires.

Lucky 8

One-time

Covers a month of hosting tools and form delivery.

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Prosper 88

$28

Monthly

Funds one new research guide each month. Name in our supporters list.

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Fortune 168

$168

One-time

Sponsors a full contest prize pool. Shout-out in the winner announcement.

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Patron 888

$888

One-time or annual

Underwrites a new tool or translation. Credit on the tool page (optional).

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Where your support goes

Use	Share
Ongoing operations — tools, forms, data, security	30%
Research & translation	25%
Promotion & marketing	15%
Hiring talent — writers, translators, developers	20%
Contests & prizes	10%

Contributions support an independent publication and are not tax-deductible charitable donations. No goods or services are promised unless stated in a tier.