Life & fun · alternatives · 2026

24 alternatives to Tool for WebSocket benchmarks with Millions of concurrent connections

Websocket Client and Server for benchmarks with Millions of concurrent connections. - oatpp/benchmark-websocket

This tool benchmarks WebSocket performance under extreme load conditions, enabling developers to test systems handling millions of concurrent connections simultaneously. It's designed for engineers working on real-time… Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. Tool for WebSocket benchmarks with Millions of concurrent connections launched in 2019; newer entries below may have overtaken it.

1. 12F
   2M fully loaded concurrent WebSockets▲158

   oatpp benchmark for 2 Million fully-loaded concurrent websocket connections.

   2019 · oatpp.io · its alternatives →

2. 25C
   5M Concurrent WebSockets▲6

   oatpp benchmark for 5 Million fully-loaded concurrent websocket connections.

   2019 · oatpp.io · its alternatives →

3. 3
   HTML5 Speedtest by Ookla▲282

   The world’s most trusted internet speedtest

   2016 · beta.speedtest.net · its alternatives →

4. 4DA
   DriftDB – an open source WebSocket backend for real-time apps▲367

   Hey HN! I’ve written a bunch of WebSocket servers over the years to do simple things like state synchronization, WebRTC signaling, and notifying a client when a backend job was run. I realized that if I had a simple way to create a private, temporary, mini-redis that the client could talk to directly, it would save a lot of time. So we created DriftDB. In addition to the open source server that you can run yourself, we also provide https://jamsocket.live where you can use an instance we host on Cloudflare’s edge (~13ms round trip latency from my home in NY). You may have seen my…

   2023 · driftdb.com · its alternatives →

5. 5
   ZeroHTTPd: A web server to teach Linux performance, with benchmarks▲472

   Articles in this series Part I. Iterative ServersPart II. Forking ServersPart III. Pre-forking ServersPart IV. Threaded ServersPart V. Pre-threaded ServersPart VI: poll-based serverPart VII: epoll-…

   2019 · unixism.net · its alternatives →

6. 6
   Go HTTP Request Router Benchmark▲89

   Go HTTP request router and web framework benchmark - julienschmidt/go-http-routing-benchmark

   2014 · github.com · its alternatives →

7. 7
   Web Load Speed Test▲311

   Test your website load speed from 6 locations at once

   2017 · its alternatives →

8. 8IB
   I built an internet speed analytics tool▲89

   Senior full stack software engineer with 8+ years shipping production systems in React, Node.js, Python, and Rails. Previously a Product Engineer at Ghost. Based in South Korea.

   2021 · ronaldlangeveld.com · its alternatives →

9. 9
   WebSocket-first development▲120

   An demo app for lattice-core. Contribute to jasonl99/card_game development by creating an account on GitHub.

   2017 · github.com · its alternatives →

10. 10AU
    A Unixy approach to WebSockets▲421

    websocketd is a single binary that wraps a command-line program and serves it over a WebSocket. Your program reads lines from stdin and writes lines to stdout.

    2015 · websocketd.com · its alternatives →

11. 11
    Python can make 3M+ WebSocket keys per second▲83

    :zap: Optimizing Python code by implementing a C++ extension - szabolcsdombi/optimization-demo

    2023 · github.com · its alternatives →

12. 12
    Speedometer 3.0▲131

    Benchmarking app performance on the modern web

    2024 · github.com · its alternatives →

13. 13
    Browser Arena▲175

    Open-source benchmarks for cloud browser infrastructure

    Apr 2026 · browserarena.ai · its alternatives →

14. 14
    SocketCluster.io – flexible open-source real-time server with pub/sub▲217

    Scalable open source pub/sub SDK with support for RPC, JWT authentication and Kubernetes — optimized for async/await

    2016 · socketcluster.io · its alternatives →

15. 15
    A Multiplayer Geography Game Using WebSockets▲220

    A multiplayer geography game using Websockets. Contribute to abrenaut/posio development by creating an account on GitHub.

    2016 · github.com · its alternatives →

16. 16
    Polar Signals Continuous Profiler – Systematic Performance Profiling▲44

    Check out our new project to add some insight into OOM kill events for Go programs. Source code: https://github.com/parca-dev/oomprof/ Description of how it was put together: https://www.polarsignals.com/blog/posts/2025/08/13/oomprof

    2021 · polarsignals.com · its alternatives →

17. 17SA
    Sping – An HTTP/TCP latency tool that's easy on the eye▲178

    I've frequently found myself using [nvitop](https://github.com/XuehaiPan/nvitop) to diagnose GPU/CPU contention issues. The two best things about it are: - It's easy to install if I can access pip in the container - It makes a compelling screenshot (which helps me communicate with coworkers.) With those two lessons in mind: Here is Sping! Purpose: Help observe and diagnose latency issues at layer 4+ (TCP/HTTP/HTTPS) Two good things about it: - It's easy to install if you have pip. (Available at…

    2025 · dseltzer.gitlab.io · its alternatives →

18. 18
    Platypus 3.0 – Server monitoring with websockets▲42

    Large-scale server monitoring application written in Golang - gmemstr/Platypus

    2019 · github.com · its alternatives →

19. 19
    Wsta – a CLI for working with WebSockets written in Rust▲85

    A CLI development tool for WebSocket APIs. Contribute to eliihen/wsta development by creating an account on GitHub.

    2016 · github.com · its alternatives →

20. 20
    OpenAI WebSocket Mode for Responses API▲131

    Persistent AI agents. Up to 40% faster.

    Mar 2026 · developers.openai.com · its alternatives →

21. 21
    An open source performance monitoring tool▲135

    Hey HN. We’re Jay and Vadim from Highlight.io (https://highlight.io). We’re building an open source [1] monitoring platform for web applications. Today we’re excited to be sharing a performance tool we’ve been working on, which helps you inspect the latency of code execution from the client to the server. As engineers at past startups, we often had to debug slow queries, poor load times, inconsistent errors, etc... While tools like Jaegar [2] helped us inspect server-side performance, we had no way to tie user events to the traces we were inspecting. In other words, although we had…

    2024 · github.com · its alternatives →

22. 22
    Trying to fix the web scraping industry's benchmark problem▲18

    We've been trying to evaluate web scraping companies, but when you look at their benchmarks, you can't verify anything, and they mostly exist to prove the company is successful. They put somewhere between 98% and 100% because they pick their own urls, define success their own way, and don't publish the harness. We also saw companies like scrapfly astroturf websites like scrapeway and call them independent. So, we built an open source benchmark that we want to represent the frontier of web data. We're trying to look across all major anti-bot providers and industries, to build a comprehensive…

    Jul 2026 · github.com · its alternatives →

23. 23
    Building WebSocket in Apache Iggy with Io_uring and Completion Based IO▲29

    Nov 2025 · iggy.apache.org · its alternatives →

24. 24
    Simple, fast and fun communication over Websockets▲17

    Simple, fast & fun communication over Websockets. Contribute to penalosa/epsilon development by creating an account on GitHub.

    2020 · github.com · its alternatives →

Ranked by how close each launch is in meaning, then by votes. Prices were read from each product’s own site when checked and can change. Refine with your own description →