# Numina: Formulas that flow

> A pure formula language (tokenize → Pratt parse → evaluate; refs, ranges, SUM/AVG/MIN/MAX) plus a Sheet that resolves recursively - dependency-ordered recalc + cycle detection for free. 11 tests, no DOM.

Numina is a reactive spreadsheet engine built around a pure formula language that tokenizes, Pratt-parses, and evaluates expressions with cell references, ranges, and functions like SUM, AVG, MIN, and MAX. The interesting part is the Sheet that resolves formulas recursively, which gives you dependency-ordered recalculation and cycle detection for free. It is a from-scratch, dependency-light build with no DOM coupling that you can download and run locally.

## About the app

A reactive dependency engine

## What to take away

- A pure formula language (tokenize → Pratt parse → evaluate; refs, ranges, SUM/AVG/MIN/MAX) plus a Sheet that resolves recursively - dependency-ordered recalc + cycle detection for free. 11 tests, no DOM.
- Download: Numina (ZIP)

## Tags

Free software, Numina

## Read the full write-up

/downloads/numina.zip

## Terms used in this piece

- https://dfieldsolutions.com/en/glossary/llm-evaluation.md

## We build this for clients

https://dfieldsolutions.com/en/services/full-stack

## More from the lab

- https://dfieldsolutions.com/en/lab/sylex.md — Sylex: Make sense of the slashes
- https://dfieldsolutions.com/en/lab/kindra.md — Kindra: Miss a beat, not the rhythm
- https://dfieldsolutions.com/en/lab/voxara.md — Voxara: Argue better. Lose gracefully
- https://dfieldsolutions.com/en/lab/wraithward.md — Wraithward: Spot the bait before you bite

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Source: https://dfieldsolutions.com/en/lab/numina
DField Solutions — Torony köz 5-1.a, 2120 Dunakeszi, Hungary — +36 20 722 0002 — dezso@dfieldsolutions.com
Booking: see https://dfieldsolutions.com/en/contact