# numworks/epsilon

Modern graphing calculator operating system.

Repository: https://github.com/numworks/epsilon
Canonical: https://ross.abutalabs.com/products/epsilon
Homepage: https://www.numworks.com/resources/engineering/software/
Language: C++
License Family: other
Last push: 2026-03-18T10:04:44+00:00

## Health v2 (maintenance only)
Score: 65/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 72, release rhythm 35, longevity 100
- inputs: {"age_days": 3292, "days_push": 168, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases, no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1945, forks 509 (observed 2026-08-28T04:05:57.727775+00:00)

## What it is
Epsilon is a high-performance operating system for the NumWorks graphing calculator, written in C++, with eleven apps covering the high school mathematics curriculum. It can also be compiled as a standalone desktop application or run in a browser-based online simulator.

## Use cases
- run a graphing calculator OS on a NumWorks calculator
- try a graphing calculator in the browser via the online simulator
- build custom calculator firmware
- develop external apps for the NumWorks calculator
- study embedded OS architecture from keyboard driver to math engine
- use a calculator for high school math coursework

## When to choose
- you own a NumWorks calculator and want to update or customize its firmware
- you want to develop external apps or custom firmware for the calculator
- you need a free, open graphing calculator experience in a browser or on desktop
- you want to learn how an embedded math-focused OS is structured

## When to avoid
- you need a calculator OS for TI or Casio hardware
- you want general-purpose embedded Linux development
- you need a license permitting unrestricted redistribution (the repo has no open license, all rights reserved)

## Facets
- artifact type: application
- maturity: active
- function: embedded, interpreter, gui, simulation
- domain: education, mathematics, embedded-systems, operating-systems
- platform: embedded, cross-platform, cpp
- tags: graphing-calculator, firmware, calculator-os, math-engine, numworks, web

## Member repositories
- numworks/epsilon (main) score 65

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:05:57.727775+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T03:07:58.527827+00:00, confidence not recorded.
  - readme: https://github.com/numworks/epsilon (fetched 2026-08-28T04:05:57.727775+00:00, sha 7a411f13cbaf)
  - homepage: https://www.numworks.com/resources/engineering/software/ (fetched 2026-08-29T10:46:58.622743+00:00, sha f2a4aeb1ce28)
- Data as of 2026-08-30T08:39:29.467469+00:00.