# JanKallman/EPPlus

Create advanced Excel spreadsheets using .NET

Repository: https://github.com/JanKallman/EPPlus
Canonical: https://ross.abutalabs.com/products/epplus
Language: C#
License Family: other
Topics: excel, ooxml, spreadsheet, dotnet
Archived: true
Last push: 2020-08-29T16:29:42+00:00

## Health v2 (maintenance only)
Score: 10/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 0, release rhythm 8, longevity 100
- inputs: {"age_days": 3339, "days_push": 2195, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: archived, no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 3777, forks 1178 (observed 2026-08-28T04:08:18.309732+00:00)

## What it is
EPPlus is a .NET library for reading and writing Excel xlsx files using the Office Open XML format, with no dependencies or Excel interop required. This original JanKallman repository is archived; development moved to EPPlusSoftware/EPPlus under a new noncommercial license.

## Use cases
- generate excel reports from .net applications
- read xlsx files in c# without excel installed
- create spreadsheets with charts and pivot tables programmatically
- export data grids to excel
- add formulas and conditional formatting to worksheets in code
- encrypt or protect generated excel workbooks

## When to choose
- you need a mature LGPL-licensed .NET library for Excel file manipulation without interop
- you want fast cell access via dictionaries and full .NET integration
- you need features like charts, pivot tables, VBA, and formula calculation

## When to avoid
- you need ongoing updates or support - use the successor EPPlusSoftware/EPPlus instead
- your project is commercial and you want the newer versions under the Polyform Noncommercial license
- you need to edit other Office formats like docx or pptx

## Facets
- artifact type: library
- maturity: abandoned
- function: serialization, file-system
- domain: spreadsheets, files, developer-tools
- platform: dotnet, cross-platform
- tags: excel, ooxml, xlsx, spreadsheet-generation, no-interop, archived-repository

## Member repositories
- JanKallman/EPPlus (main) score 10

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:08:18.309732+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 2026-08-29T18:27:48.365291+00:00, confidence not recorded.
  - readme: https://github.com/JanKallman/EPPlus (fetched 2026-08-28T04:08:18.309732+00:00, sha 219de6f5b905)
- Data as of 2026-08-30T08:39:29.467469+00:00.