Solutions → Financial models & calculators
The exact number, this week.
61 tested models across 9 families: retirement, mortgages, equity compensation and tax, Social Security, longevity, debt, education, and business. Embed one with a script tag, call it over REST, or hand it to an AI copilot over MCP. Each ships with published rules, a second implementation built independently that had to agree, and a record on every answer.
3 models free · no API key · no card
What you ship
Calculators on your marketing site
A live, tested calculator in a CMS block: two lines of markup, self-sizing, carrying its own disclosures. It needs no backend and no engineering project.
Decision tools inside your product
POST JSON from your backend and render the answer your way: outputs, edge-case notes, assumptions, and the sourced figures used, in one response.
Real math behind your AI copilot
Over MCP, your assistant runs the actual model instead of approximating one, and can check a claim before speaking it.
How it works
Pick the model
Browse the catalog for each model’s inputs, valid ranges, formulas, assumptions, and what it leaves out. You know what you’re integrating before you write a line.
Drop it in
A script tag for pages, REST for backends, MCP for agents, with the same tested engine under all three. Change delivery styles later without changing the math.
Keep the receipt
Every response pins the model version it ran on and carries a record of the answer with cited sources. Behavior moves only with a version bump and a public changelog entry. How each model is tested before release is written up at worthune.com/methodology.
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<script async src="https://worthune.com/embed.js"></script>The same rules on every surface. Inputs outside a model’s valid range are rejected with per-field errors rather than silently adjusted. The models compute planning figures, labeled as illustrative rather than as investment, tax, or legal advice, and each one publishes what it deliberately leaves out.
Where it lives in pricing. 3 models are free to call, with no signup and no key. The whole catalog is $495 a month on Launch, with unbranded embeds and API results, and every paid plan includes the household engine behind unified household management. Pricing in full.
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