Canonical sources for HOL4 theorem-proving system. Branch develop is where “mainline development” occurs; when develop passes our regression tests, master is merged forward to catch up.
Star History
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+19
STARS · LAST 30 DAYS
1
PER DAY
#2
MOST-STARRED Standard ML
| Window | 7 days | 30 days | 90 days |
|---|---|---|---|
| Stars gained | +7 | +19 | +90 |
| Per day | 1 | 1 | 1 |
| Forks gained | +1 | +4 | +10 |
HOL gained 19 stars in the last 30 days, about 1 a day, and now has 759. It is about 17 years old and has averaged roughly 45 stars a year. It ranks #2 among Standard ML repositories and #5,115 across all languages on GitHubRepo.
Trending Record
53
DAYS ON TRENDING
#100
BEST RANK
Oct 29, 2009
FIRST APPEARANCE
Active
STATUS TODAY
HOL has maintained a continuous presence across global trending indexes, peaking at #100. Below is the 30-day activity profile:
💡 Overview
HOL is an open-source project written in Standard ML: Canonical sources for HOL4 theorem-proving system. Branch develop is where “mainline development” occurs; when develop passes our regression tests, master is merged forward to catch up.
Engineered for speed, consistency, and developer ease, it solves common hurdles in higher-order-logic, lambda-calculus, theorem-proving. 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 Standard ML 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/HOL-Theorem-Prover/HOL.git
cd HOL⚙ System Requirements
Platforms
- • macOS
- • Linux
- • Windows
Runtime & Dependencies
Standard ML environment and standard tooling
Architecture
x86_64, ARM64 (Apple Silicon & Graviton)
🧠 How It Works
HOL coordinates its core functionality through a modular Standard ML 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 HOL into Standard ML 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 NOASSERTION license.
🚀 Getting Started
Install HOL using your package manager: `git clone https://github.com/HOL-Theorem-Prover/HOL.git`
Initialize your project workspace or configuration file for HOL.
Import HOL into your codebase or invoke it directly from your terminal.
Execute your test suite or run `HOL --help` to verify successful setup.
👍 Strengths
⚠️ Considerations
⇄ Alternatives & Direct Competitors
👥 Who Should Use This
Developers and engineering teams building with Standard ML, seeking reliable, tested, and actively maintained tooling for production workloads.
🏆 Nearby in the Rankings
HOL-Theorem-Prover/HOL is currently ranked #5,115 by stars across every repository tracked on GitHubRepo. These are adjacent projects:
| Rank | Repository | Language | Stars | Action |
|---|---|---|---|---|
| #5,106 | ARMSX2/ARMSX3 | C++ | ★ 762 | Compare ↗ |
| #5,111 | opral/lix | Rust | ★ 761 | Compare ↗ |
| #5,111 | mguessan/davmail | Java | ★ 761 | Compare ↗ |
| #5,111 | juggler-ai/juggler | JavaScript | ★ 761 | Compare ↗ |
| #5,114 | huggingface/kernels | Python | ★ 760 | Compare ↗ |
| #5,115 | HOL-Theorem-Prover/HOL This Project | Standard ML | ★ 759 | |
| #5,115 | cavalle/steak | Ruby | ★ 759 | Compare ↗ |
| #5,115 | mierau/hotline | Swift | ★ 759 | Compare ↗ |
| #5,117 | Quramy/ts-graphql-plugin | TypeScript | ★ 758 | Compare ↗ |
| #5,117 | xgo-dev/llgo | Go | ★ 758 | Compare ↗ |
| #5,117 | ONLYOFFICE/onlyoffice-nextcloud | PHP | ★ 758 | Compare ↗ |
Frequently Asked Questions
What does HOL do? +
Canonical sources for HOL4 theorem-proving system. Branch develop is where “mainline development” occurs; when develop passes our regression tests, master is merged forward to catch up.
What language is HOL written in? +
The primary language is Standard ML. Topics include: higher-order-logic, lambda-calculus, theorem-proving.
Is HOL actively maintained? +
Yes, the last recorded push was on Oct 1, 2026 with 242 open issues being tracked.
How many stars does HOL have? +
HOL has 759 stars and 175 forks on GitHub.
How does HOL rank among GitHub repositories? +
With 759 stars, HOL-Theorem-Prover/HOL is ranked #5,115 globally across all repositories tracked on GitHubRepo and #2 among Standard ML projects.
What license is HOL distributed under? +
The repository reports a NOASSERTION license. Always verify the repository LICENSE file for legal terms.
