a .NET library that can read/write Office formats without Microsoft Office installed. No COM+, no interop.
⚡ Executive Summary & Quick Facts
Authoritative Sourcenpoi is npoi is an open-source project written in C#: a .NET library that can read/write Office formats without Microsoft Office installed. No COM+, no interop..
| Repository | nissl-lab/npoi ↗ |
|---|---|
| Primary Category | biff |
| Language & Stack | C# |
| Software License | Apache-2.0 |
| Community Traction | ★ 6.2K stars · ⑂ 1.5K forks · #2,110 globally |
| Maintenance | ● Active (Last commit: Oct 7, 2026) · 59 open issues |
| Target Audience | Developers and engineering teams building with C#, seeking reliable, tested, and actively maintained tooling for production workloads. |
Star History
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+155
STARS · LAST 30 DAYS
5
PER DAY
#86
MOST-STARRED C#
| Window | 7 days | 30 days | 90 days |
|---|---|---|---|
| Stars gained | +0 | +155 | +450 |
| Per day | 1 | 5 | 5 |
| Forks gained | +0 | +30 | +74 |
npoi gained 155 stars in the last 30 days, about 5 a day, and now has 6.2K. It is about 14 years old and has averaged roughly 443 stars a year. It ranks #86 among C# repositories and #2,110 across all languages on GitHubRepo.
Trending Record
18
DAYS ON TRENDING
#3922
BEST RANK
Oct 7, 2026
FIRST APPEARANCE
Active
STATUS TODAY
npoi has maintained a continuous presence across global trending indexes, peaking at #3922. Below is the 30-day activity profile:
💡 Overview
npoi is an open-source project written in C#: a .NET library that can read/write Office formats without Microsoft Office installed. No COM+, no interop.
Engineered for speed, consistency, and developer ease, it solves common hurdles in biff, dotnetcore, excel. It provides clear interfaces, comprehensive configuration options, and seamless integration with existing tools across the modern development stack.
⚡ Key Features
Optimized execution pipeline written in C# for predictable speed.
Zero-friction configuration with comprehensive sensible defaults out of the box.
Cross-platform runtime support across Linux, macOS, and Windows environments.
Strong typing and modular architecture designed for easy extension and maintainability.
Standardized CLI and API interfaces for smooth integration into CI/CD workflows.
Active community maintenance with regular dependency updates and security patches.
📥 Installation
$ git clone https://github.com/nissl-lab/npoi.git
cd npoi⚙ System Requirements
Platforms
- • macOS
- • Linux
- • Windows
Runtime & Dependencies
C# environment and standard tooling
Architecture
x86_64, ARM64 (Apple Silicon & Graviton)
🧠 How It Works
npoi coordinates its core functionality through a modular C# pipeline. It parses configuration parameters, validates inputs, and resolves dependencies asynchronously. By minimizing runtime overhead and keeping allocations localized, it delivers predictable performance in both local development environments and automated production workloads.
🎯 Production Use Cases
Production System Integration
Embed npoi into C# backend services to handle core application logic.
CI/CD Automated Pipelines
Run automated validation, builds, and integration suites during deployments.
Developer Tooling & Workflows
Accelerate developer onboarding with pre-configured project utilities.
Open Source Extension
Fork and customize internal modules under the repository's open Apache-2.0 license.
🚀 Getting Started
Install npoi using your package manager: `git clone https://github.com/nissl-lab/npoi.git`
Initialize your project workspace or configuration file for npoi.
Import npoi into your codebase or invoke it directly from your terminal.
Execute your test suite or run `npoi --help` to verify successful setup.
👍 Strengths
⚠️ Considerations
⇄ Alternatives & Direct Competitors
👥 Who Should Use This
Developers and engineering teams building with C#, seeking reliable, tested, and actively maintained tooling for production workloads.
🏆 Nearby in the Rankings
nissl-lab/npoi is currently ranked #2,110 by stars across every repository tracked on GitHubRepo. These are adjacent projects:
| Rank | Repository | Language | Stars | Action |
|---|---|---|---|---|
| #2,105 | graphql-java/graphql-java | Java | ★ 6.2K | Compare ↗ |
| #2,106 | rust-windowing/winit | Rust | ★ 6.2K | Compare ↗ |
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| #2,108 | aws/aws-sdk-php | PHP | ★ 6.2K | Compare ↗ |
| #2,109 | vercel-labs/scriptc | TypeScript | ★ 6.2K | Compare ↗ |
| #2,110 | nissl-lab/npoi This Project | C# | ★ 6.2K | |
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Frequently Asked Questions
What does npoi do? +
a .NET library that can read/write Office formats without Microsoft Office installed. No COM+, no interop.
What language is npoi written in? +
The primary language is C#. Topics include: biff, dotnetcore, excel, office-file-api, openxml.
Is npoi actively maintained? +
Yes, the last recorded push was on Oct 7, 2026 with 59 open issues being tracked.
How many stars does npoi have? +
npoi has 6,196 stars and 1,489 forks on GitHub.
How does npoi rank among GitHub repositories? +
With 6,196 stars, nissl-lab/npoi is ranked #2,110 globally across all repositories tracked on GitHubRepo and #86 among C# projects.
What license is npoi distributed under? +
The repository reports a Apache-2.0 license. Always verify the repository LICENSE file for legal terms.
