Solutions → Financial models & calculators
The exact number, this week.
57 verified models across 8 families — retirement, mortgages, equity comp & tax, Social Security, longevity, debt, education, business. Embed one with a script tag, call it over REST, or hand it to an AI copilot over MCP. Each ships with a published spec, an independently built second implementation that had to agree, and an evidence record on every answer.
3 models free forever · no API key · no card
What you ship
Calculators on your marketing site
A live, verified calculator in a CMS block — two lines of markup, self-sizing, carrying its own disclosures. No backend, 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 constants used, in one response.
Real math behind your AI copilot
Over MCP, your assistant runs the actual model instead of approximating one, and can verify a claim before speaking it.
How it works
Pick the model
Browse the catalog — inputs, valid ranges, formulas, assumptions, and what each model refuses to compute. 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 — the same Concordance-tested engine under all three. Change delivery styles later without changing the math.
Keep the receipt
Every response pins its spec version and carries a SHA-256 evidence record and cited sources. Behavior moves only with a version bump and a public changelog entry.
<div data-worthune-embed="social-security-timing"></div>
<script async src="https://worthune.com/embed.js"></script>The honesty rules hold on every surface. Inputs outside a model’s valid range are rejected with per-field errors, never silently adjusted. Nothing here is investment, tax, or legal advice — the models compute, and each spec publishes what it deliberately refuses to model.
Where it lives in pricing. 3 models are free to call forever — no signup, no key. The whole catalog is $495 a month on Launch, with unbranded embeds and API results. Pricing in full.