Run – a CLI universal code runner I built while learning Rust

In plain words

Run is a command-line tool for executing code across multiple programming languages, including Python, JavaScript, Ruby, Rust, Go, and C/C++. It supports running code snippets from CLI flags, executing files, processing piped input, and provides interactive REPLs that users can switch between. The tool automatically detects languages from file extensions or explicit flags and handles compilation for compiled languages. Built in Rust with minimal dependencies, Run is designed for developers who work with multiple languages and want a unified interface for quick code execution.

written from the facts on this page · September 2026

From the sources

Universal multi-language runner and smart REPL written in Rust. - Esubaalew/run

In the maker’s words, at launch

Hi HN — I’m learning Rust and decided to build a universal CLI for running code in many languages. The tool, Run, aims to be a single, minimal dependency utility for: running one-off snippets (from CLI flags), running files, reading and executing piped stdin, and providing language-specific REPLs that you can switch…

• 
  snippet.run2024 · snippet.run · ▲149

  Run your code, from the cloud on your computer

• 
  A Rust macro that parses Java-like syntax and runs it as a Rust program2018 · gitlab.com · ▲195

  A Rust macro that parses Java-like syntax and runs it as a Rust program

• 
  Using Rust to write shell-script like tasks2020 · github.com · ▲231

  Common rust command-line macros and utilities, to write shell-script like tasks in a clean, natural and rusty way - rust-shell-script/rust_cmd_lib

• 
  Runc – Compile and run C in one command2020 · github.com · ▲41

  compile/run for the lazy. Contribute to alcover/lacy development by creating an account on GitHub.

• 
  Openleetcode – Local LeetCode runner where tests live in the repoAug 2026 · github.com · ▲73

  You write a standard solution, just like on LeetCode, and run it through the CLI. It identifies the problem by ID or title, executes your code against local test cases, and shows the result. It currently supports around 1.4k problems and multiple languages, including Python, C++, Rust, Java, Go, TypeScript, Swift, and others. The project is still an MVP. System design, SQL, and concurrency problems are not supported yet, but support for more problem types is planned. Made in Haskell!

• 
  ut – Rust based CLI utilities for devs and IT2025 · github.com · ▲170

  Hey HN, I find myself reaching for tools like it-tools.tech or other random sites every now and then during development or debugging. So, I built a toolkit with a sane and simple CLI interface for most of those tools. For the curious and lazy, at the moment, ut has tools for, - Encoding: base64 (encode, decode), url (encode, decode) - Hashing: md5, sha1, sha224, sha256, sha384, sha512 - Data Generation: uuid (v1, v3, v4, v5), token, lorem, random - Text Processing: case (lower, upper, camel, title, constant, header, sentence, snake), pretty-print, diff - Development Tools: calc, json…

• 
  /dev/null▲482

  a social network for devs

  Dev tools · 3d ago · dev-null.sh

• 
  Whiteboard (YC W26) – an open-source IDE for thoughtful software design▲423

  open-source IDE for thoughtful software design. Contribute to devdotfast/whiteboard development by creating an account on GitHub.

  Dev tools · 27d ago · github.com

• 
  Reladraw – A diagram language where you decide where to place things▲411

  Contribute to reladraw/reladraw development by creating an account on GitHub.

  Dev tools · 25d ago · github.com

• 
  OpenBot▲362

  Grok Bot alternative: free, local, open-source, multiplayer

  Dev tools · 23d ago · openbot.run

• 
  Talanoa▲346

  Hi HN, I’m a fullstack developer, and honestly, I’ve lost count of how many side projects I’ve worked on over the years. But one idea kept coming back to me: a different kind of email client. It first came to me in 2014: “What if we could handle emails more like conversations?” Every year, I’d revisit this concept in my “Build Notes.” Ten years later, no one had built exactly what I had in mind — so I finally decided to do it myself. That’s how Talanoa was born. I wanted something focused on people, not timelines. I was tired of marking messages as unread just to remember to reply later, or…

  Dev tools · 20d ago · talanoa.email

• 
  CoreSpeed▲332

  One MCP for everything your agents need: apps, memory, tools

  Dev tools · 28d ago · corespeed.io

• 
  Cursor 2.0▲957

  Our first coding model and new interface for agents

  AI · Oct 2025 · cursor.com

• 
  Flask▲806

  Notion + Loom, for video collaboration.

  AI · 2025 · flask.do

• 
  Strange Attractors▲804

  I went down the rabbit hole on a side project and ended up building this: Strange Attractors(https://blog.shashanktomar.com/posts/strange-attractors). It’s built with three.js. Working on it reminded me of the little "maths for fun" exercises I used to do while learning programming in early days. Just trying things out, getting fascinated and geeky, and being surprised by the results. I spent way too much time on this, but it was extreme fun. My favorite part: someone pointed me to the Simone Attractor on Threads. It is a 2D attractor and I asked GPT to extrapolate it to…

  AI · Oct 2025 · blog.shashanktomar.com

• 
  Orchestra▲793

  A chat-centric workspace for builders and modern teams

  Work · 2025 · orch.so

• 
  Autism Simulator▲779

  Hey all, I built this. It’s not trying to capture every autistic experience (that’d be impossible). It’s based on my own lived experience as well as that of friends on the spectrum. I'm trying to give people a feel for what masking, decision fatigue, and burnout can look like day-to-day. That’s hard to explain in words, but easier to show through choices and stats. I'm not trying to "define autism". I’ve gotten good feedback here about resilience, meds, and difficulty tuning. I’ll keep tweaking it. If even a few people walk away thinking, "ah, maybe that’s why my coworker struggles in those…

  Life & fun · 2025 · autism-simulator.vercel.app

• 
  Director▲768

  Lovable for web automation

  AI · 2025 · director.ai