cartularium
A community of spreadsheet practitioners building everything we wished existed.
The volumes
An encyclopaedia of spreadsheet practice. Function reference, concept guides, blog.
A reference of where spreadsheet engines diverge. 251 divergences across eight engines, indexed by cause, with the fixture tests behind every claim.
A package manager and registry for named functions and lambdas: versioned, dependency-tracked, importable.
A programming language with spreadsheet semantics: reactive cells, broad compatibility with other engines, and a compiled runtime.
What cartularium is
A community of spreadsheet practitioners collecting what we know into volumes anyone can cite.
Cartularium started as sheets.wiki: a durable place for the answers people kept retyping in Discord and Reddit threads, with a permalink and an edit history. The wiki kept running into questions it couldn't really answer on its own, mostly about how the engines disagree and whether somebody had already written the formula. Those gaps grew into the other volumes.
The name fits the shape. A cartularium in medieval Latin meant either a book of transcribed documents or the people who kept the book. Cartularium the imprint is both: the community writes down what it knows, and the community keeps the record current.
Recent across the imprint
/functions indexes every documented function on a single page. 527 entries across 19 categories, exported as html, tsv, and json for anyone who wants the data outside the wiki.
/functions →