ClosedXML/ClosedXML
ClosedXML is a .NET library for reading, manipulating and writing Excel 2007+ (.xlsx, .xlsm) files. It aims to provide an intuitive and user-friendly interface to dealing with the underlying OpenXML API. observed · 2026-08-28
Health v2 · maintenance only
87/100
- Activity 94
- Release rhythm 71
- Longevity 100
How is this computed?
round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10) — computed 2026-09-03. Adoption (stars, forks) is never an input.
- gap_med: 180
- age_days: 3658
- days_rel: 39
- days_push: 38
- n_releases_24m: 4
Adoption not part of the score
5686 stars · 931 forks observed · 2026-08-28
What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded
ClosedXML is a .NET library for reading, manipulating, and writing Excel 2007+ (.xlsx, .xlsm) files. It provides an intuitive, user-friendly API on top of the underlying OpenXML SDK.
Use cases
- create excel files in c#
- read xlsx files in .net
- manipulate excel spreadsheets programmatically
- export data to excel from asp.net
- generate xlsx reports without excel installed
- convert data tables to excel workbooks
When to choose
- you need a friendly high-level API for Excel files in .NET instead of raw OpenXML
- you need to read, write, or modify .xlsx/.xlsm files without Microsoft Excel installed
- you work with large spreadsheets and care about performance
When to avoid
- you need to work with legacy .xls binary files
- you need a stable, unchanging public API - it is still evolving with migration guides between releases
- you need Excel automation like macros execution or live Excel features
Facets
library · maturity active
parser file-system developer-tools files spreadsheets developer-tools dotnet cross-platform excel xlsx openxml spreadsheet c-sharp
1 source
- readme: https://github.com/ClosedXML/ClosedXML · fetched 2026-08-28 · ab45d3ebac23
Member repositories
| Repository | Role | Health v2 |
|---|---|---|
| ClosedXML/ClosedXML | main | 87 |
For agents
markdown · JSON · MCP: product_card(name="ClosedXML/ClosedXML")
Data as of 2026-08-30T08:39:29.467469+00:00 · Report a problem