About MundoKit

MundoKit is a collection of small, single-purpose web tools for questions that are new or badly served: the cost of a call to a new AI model, a tax rule that changed this year, how long an EV takes to charge on a given charger, or what a UUIDv7 encodes.

How we check our math

• Every tool page writes out its formula or method, with worked examples you can redo by hand.
• Rates, limits and prices come from official sources, linked on each page with the date we last checked them.
• Each tool's logic has automated unit tests, including the worked examples shown on the page.
• When a rule changes, we update the data file and the "last reviewed" date.

Privacy by design

Tools run entirely in your browser. Files you open in a converter are not uploaded anywhere. See our privacy page.

Not advice

Results are general estimates for information. They are not tax, legal, financial or medical advice.