A configuration as code language with rich validation and tooling.
Star History
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+288
STARS · LAST 30 DAYS
10
PER DAY
#52
MOST-STARRED Java
| Window | 7 days | 30 days | 90 days |
|---|---|---|---|
| Stars gained | +6 | +288 | +900 |
| Per day | 1 | 10 | 10 |
| Forks gained | +2 | +8 | +20 |
pkl gained 288 stars in the last 30 days, about 10 a day, and now has 11.5K. It is about 3 years old and has averaged roughly 3.8K stars a year. It ranks #52 among Java repositories and #866 across all languages on GitHubRepo.
Trending Record
8
DAYS ON TRENDING
#807
BEST RANK
Sep 25, 2026
FIRST APPEARANCE
Active
STATUS TODAY
pkl has maintained a continuous presence across global trending indexes, peaking at #807. Below is the 30-day activity profile:
💡 Overview
pkl is an open-source project written in Java: A configuration as code language with rich validation and tooling.
Engineered for speed, consistency, and developer ease, it solves common hurdles in config, configuration, data. 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 Java 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/apple/pkl.git
cd pkl⚙ System Requirements
Platforms
- • macOS
- • Linux
- • Windows
Runtime & Dependencies
JDK 17 or higher (OpenJDK / GraalVM)
Architecture
x86_64, ARM64 (Apple Silicon & Graviton)
🧠 How It Works
pkl coordinates its core functionality through a modular Java 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 pkl into Java 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 pkl using your package manager: `git clone https://github.com/apple/pkl.git`
Initialize your project workspace or configuration file for pkl.
Import pkl into your codebase or invoke it directly from your terminal.
Execute your test suite or run `pkl --help` to verify successful setup.
👍 Strengths
⚠️ Considerations
⇄ Alternatives & Direct Competitors
👥 Who Should Use This
Developers and engineering teams building with Java, seeking reliable, tested, and actively maintained tooling for production workloads.
🏆 Nearby in the Rankings
apple/pkl is currently ranked #866 by stars across every repository tracked on GitHubRepo. These are adjacent projects:
| Rank | Repository | Language | Stars | Action |
|---|---|---|---|---|
| #861 | statsmodels/statsmodels | Python | ★ 11.7K | Compare ↗ |
| #862 | maxrave-dev/SimpMusic | Kotlin | ★ 11.7K | Compare ↗ |
| #863 | horsicq/Detect-It-Easy | JavaScript | ★ 11.6K | Compare ↗ |
| #864 | lancedb/lancedb | Rust | ★ 11.6K | Compare ↗ |
| #865 | 0xJacky/nginx-ui | Go | ★ 11.6K | Compare ↗ |
| #866 | apple/pkl This Project | Java | ★ 11.5K | |
| #867 | electron/minimal-repro | JavaScript | ★ 11.4K | Compare ↗ |
| #868 | optiscaler/OptiScaler | C++ | ★ 11.4K | Compare ↗ |
| #869 | kornia/kornia | Python | ★ 11.4K | Compare ↗ |
| #870 | apereo/cas | Java | ★ 11.4K | Compare ↗ |
| #871 | yairm210/Unciv | Kotlin | ★ 11.4K | Compare ↗ |
Frequently Asked Questions
What does pkl do? +
A configuration as code language with rich validation and tooling.
What language is pkl written in? +
The primary language is Java. Topics include: config, configuration, data, functional, java.
Is pkl actively maintained? +
Yes, the last recorded push was on Sep 30, 2026 with 224 open issues being tracked.
How many stars does pkl have? +
pkl has 11,537 stars and 405 forks on GitHub.
How does pkl rank among GitHub repositories? +
With 11,537 stars, apple/pkl is ranked #866 globally across all repositories tracked on GitHubRepo and #52 among Java projects.
What license is pkl distributed under? +
The repository reports a Apache-2.0 license. Always verify the repository LICENSE file for legal terms.
