DotNetFiddle – JsFiddle for .Net
Test your C# code online with .NET Fiddle code editor.
DotNetFiddle – JsFiddle for .Net launched on November 20, 2013 with 217 votes, #8 of 701 launches that month and more than 99% of that year's launches. The site was still online in September 2026, 12 years on.
In plain words
DotNetFiddle is an online code editor that allows developers to test and run C# code directly in a web browser without local setup. It provides an accessible environment for writing, executing, and sharing .NET code snippets. The tool is designed for developers who want to quickly experiment with C# syntax, test small programs, or prototype ideas online. DotNetFiddle eliminates the need for installing development environments locally, making it useful for learning, debugging, and collaborative code sharing.
written from the facts on this page · September 2026
Does a similar job
all alternatives →
Anyfiddle-Write run and share code in any language/framework in browser2020 · anyfiddle.com · ▲13Anyfiddle, the online code editor for everyone
CLJS Fiddle – ClojureScript2016 · cljsfiddle.com · ▲82A private, browser-only ClojureScript playground powered by the self-hosted compiler.
DotnetEbpf - Write Linux eBPF kernel applications in C#2025 · github.com · ▲10I've been working for a good 9 months now writing a .net to C transpiler (https://github.com/KallDrexx/dntc) as a "I wonder if I can" type of project (with the intention of eventually being able to do embedded development in C# instead of C). Along the way I was trying to find good milestones to test the transpiler with. As I learned about Linux eBPF I realized that ended up being an interesting use case and created the DotnetEbpf prototype. It allows you to write Linux kernel side eBPF applications fully in C#. While with some of the limitations it may seem like it's…
Openleetcode – Local LeetCode runner where tests live in the repoAug 2026 · github.com · ▲73You 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!
More dev tools this month
the category →
open-source IDE for thoughtful software design. Contribute to devdotfast/whiteboard development by creating an account on GitHub.
Dev tools · 28d ago · github.com
Contribute to reladraw/reladraw development by creating an account on GitHub.
Dev tools · 26d ago · github.com
OpenBot▲362Grok Bot alternative: free, local, open-source, multiplayer
Dev tools · 23d ago · openbot.run
Talanoa▲346Hi 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▲332One MCP for everything your agents need: apps, memory, tools
Dev tools · 28d ago · corespeed.io
Source: Show HN post ↗
Launched alongside, November 2013
the whole month →- PG
Life & fun · 2013 · grantslatton.com
- HD
Dev tools · 2013 · blog.copper.io
- IM
Dev tools · 2013 · khamidou.github.io
- GC
Dev tools · 2013 · gitter.im
