Worthune Reviews & Product Details

Worthune is a catalog of financial planning models delivered as a REST API, an MCP server, and embeddable calculators. Each model is written to a versioned public specification and is Concordance-tested: a second implementation, written independently in a different language from the spec alone, must agree with the production engine on 250 cases per model - to one part in a billion - before any release. The harness runs in CI on every change, and a mismatch stops the release. Every response carries the spec version, the government constants it used with their primary sources and check dates, and a SHA-256 decision record you can store and recompute later to prove where a number came from. Built for developers adding financial math to fintech, wealthtech, and banking products; for teams that must show a compliance reviewer where a number came from; and for AI agents that need deterministic financial computation instead of predicted digits. Official SDKs are published for JavaScript (npm i worthune) and Python (pip install worthune), both zero-dependency, and the open eval datasets are on HuggingFace. Three models are free to call with attribution, with no signup and no API key. Pro is $199/month for the full catalog, with no per-run metering. Worthune models are illustrative planning tools, not financial advice.