World's Fastest .NET CSV Parser. Modern, minimal, fast, zero allocation, reading and writing of separated values (`csv`, `tsv` etc.). Cross-platform, trimmable and AOT/NativeAOT compatible with blazing fast SIMD vectorized parsing.
⚡ Executive Summary & Quick Facts
Authoritative SourceSep is Sep is an open-source project written in C#: World's Fastest .NET CSV Parser. Modern, minimal, fast, zero allocation, reading and writing of separated values (`csv`, `tsv` etc.). Cross-platform, trimmable and AOT/NativeAOT compatible with blazing fast SIMD vectorized parsing..
| Repository | nietras/Sep ↗ |
|---|---|
| Primary Category | csharp |
| Language & Stack | C# |
| Software License | MIT |
| Community Traction | ★ 1.5K stars · ⑂ 55 forks · #5,495 globally |
| Maintenance | ● Active (Last commit: Oct 19, 2026) · 7 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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+37
STARS · LAST 30 DAYS
1
PER DAY
#290
MOST-STARRED C#
| Window | 7 days | 30 days | 90 days |
|---|---|---|---|
| Stars gained | +7 | +37 | +90 |
| Per day | 1 | 1 | 1 |
| Forks gained | +1 | +3 | +10 |
Sep gained 37 stars in the last 30 days, about 1 a day, and now has 1.5K. It is about 4 years old and has averaged roughly 370 stars a year. It ranks #290 among C# repositories and #5,495 across all languages on GitHubRepo.
Trending Record
4
DAYS ON TRENDING
#7373
BEST RANK
Oct 19, 2026
FIRST APPEARANCE
Active
STATUS TODAY
Sep has maintained a continuous presence across global trending indexes, peaking at #7373. Below is the 30-day activity profile:
💡 Overview
Sep is an open-source project written in C#: World's Fastest .NET CSV Parser. Modern, minimal, fast, zero allocation, reading and writing of separated values (`csv`, `tsv` etc.). Cross-platform, trimmable and AOT/NativeAOT compatible with blazing fast SIMD vectorized parsing.
Engineered for speed, consistency, and developer ease, it solves common hurdles in csharp, csv, csv-parser. 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/nietras/Sep.git
cd Sep⚙ System Requirements
Platforms
- • macOS
- • Linux
- • Windows
Runtime & Dependencies
C# environment and standard tooling
Architecture
x86_64, ARM64 (Apple Silicon & Graviton)
🧠 How It Works
Sep 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 Sep 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 MIT license.
🚀 Getting Started
Install Sep using your package manager: `git clone https://github.com/nietras/Sep.git`
Initialize your project workspace or configuration file for Sep.
Import Sep into your codebase or invoke it directly from your terminal.
Execute your test suite or run `Sep --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
nietras/Sep is currently ranked #5,495 by stars across every repository tracked on GitHubRepo. These are adjacent projects:
| Rank | Repository | Language | Stars | Action |
|---|---|---|---|---|
| #5,487 | fsouza/fake-gcs-server | Go | ★ 1.5K | Compare ↗ |
| #5,487 | orbien-org/orbien | Rust | ★ 1.5K | Compare ↗ |
| #5,492 | KhronosGroup/glTF-Sample-Viewer | JavaScript | ★ 1.5K | Compare ↗ |
| #5,492 | theroyallab/tabbyAPI | Python | ★ 1.5K | Compare ↗ |
| #5,494 | jtydhr88/screenwriting-skills | Python | ★ 1.5K | Compare ↗ |
| #5,495 | nietras/Sep This Project | C# | ★ 1.5K | |
| #5,496 | msgpack/msgpack-java | Java | ★ 1.5K | Compare ↗ |
| #5,496 | apache/jena | Java | ★ 1.5K | Compare ↗ |
| #5,498 | MihailRis/voxelcore | C++ | ★ 1.5K | Compare ↗ |
| #5,499 | zackb/tether | C++ | ★ 1.5K | Compare ↗ |
| #5,500 | objectionary/eo | Java | ★ 1.5K | Compare ↗ |
Frequently Asked Questions
What does Sep do? +
World's Fastest .NET CSV Parser. Modern, minimal, fast, zero allocation, reading and writing of separated values (`csv`, `tsv` etc.). Cross-platform, trimmable and AOT/NativeAOT compatible with blazing fast SIMD vectorized parsing.
What language is Sep written in? +
The primary language is C#. Topics include: csharp, csv, csv-parser, csv-reader, csv-writer.
Is Sep actively maintained? +
Yes, the last recorded push was on Oct 19, 2026 with 7 open issues being tracked.
How many stars does Sep have? +
Sep has 1,478 stars and 55 forks on GitHub.
How does Sep rank among GitHub repositories? +
With 1,478 stars, nietras/Sep is ranked #5,495 globally across all repositories tracked on GitHubRepo and #290 among C# projects.
What license is Sep distributed under? +
The repository reports a MIT license. Always verify the repository LICENSE file for legal terms.
