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Top 23 C++ Async Projects
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Project mention: A unified build system and dependency manager for C/C++ with Cargo's features | news.ycombinator.com | 2025-06-15
Not to be confused with Scylla DB's "Seastar" C++ non-blocking event driven server SDK
https://github.com/scylladb/seastar
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C++ REST SDK
The C++ REST SDK is a Microsoft project for cloud-based client-server communication in native code using a modern asynchronous C++ API design. This project aims to help C++ developers connect to and interact with services.
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CppServer
Ultra fast and low latency asynchronous socket server & client C++ library with support TCP, SSL, UDP, HTTP, HTTPS, WebSocket protocols and 10K connections problem solution
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Sevalla
Deploy and host your apps and databases, now with $50 credit! Sevalla is the PaaS you have been looking for! Advanced deployment pipelines, usage-based pricing, preview apps, templates, human support by developers, and much more!
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G3log
G3log is an asynchronous, "crash safe", logger that is easy to use with default logging sinks or you can add your own. G3log is made with plain C++14 (C++11 support up to release 1.3.2) with no external libraries (except gtest used for unit tests). G3log is made to be cross-platform, currently running on OSX, Windows and several Linux distros. See Readme below for details of usage.
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continuable
C++14 asynchronous allocation aware futures (supporting then, exception handling, coroutines and connections)
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Project mention: Redis Pub/Sub vs Laravel Reverb: Real-Time Laravel at Its Best | dev.to | 2025-08-01
Laravel Reverb Speed: Built on top of FrankenPHP or Swoole, it's designed for high concurrency and persistent WebSocket connections.
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Rythe-Engine
Rythe is a data-oriented C++20 game engine built to make optimal use of modern hardware.
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Project mention: Show HN: Utl:parallel – Work-stealing concurrency library for C++17 | news.ycombinator.com | 2025-08-03
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areg-sdk
Remote objects act local. C++ Async RPC for threads and processes with auto-discovery and zero-boilerplate messaging.
Long time I was not here and I am very sure that none missed me :) I was busy developing new features of areg skd and creating user interface tool for areg sdk. And I must say, that working almost alone for more these 2 project, I made a huge progress. And what is very important, I have fun.
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InfluxDB
InfluxDB – Built for High-Performance Time Series Workloads. InfluxDB 3 OSS is now GA. Transform, enrich, and act on time series data directly in the database. Automate critical tasks and eliminate the need to move data externally. Download now.
NOTE:
The open source projects on this list are ordered by number of github stars.
The number of mentions indicates repo mentiontions in the last 12 Months or
since we started tracking (Dec 2020).
C++ Async discussion
C++ Async related posts
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Show HN: Utl:parallel – Work-stealing concurrency library for C++17
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Redis Pub/Sub vs Laravel Reverb: Real-Time Laravel at Its Best
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Show HN: Yet another JSON lib (C++17)
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Userver 2.10 Released
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THT v0.8.1 – A modern re-design of PHP
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Quill: High-Performance Asynchronous C++ Logging Library
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Show HN: Comprehensive inter-process communication (IPC) toolkit in modern C++
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A note from our sponsor - JetBrains
surveys.jetbrains.com | 1 Sep 2025
Index
What are some of the best open-source Async projects in C++? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | Seastar | 8,825 |
| 2 | C++ REST SDK | 8,212 |
| 3 | cppcoro | 3,627 |
| 4 | C++ Actor Framework | 3,323 |
| 5 | userver | 2,687 |
| 6 | quill | 2,437 |
| 7 | CppServer | 1,538 |
| 8 | Sming | 1,536 |
| 9 | G3log | 934 |
| 10 | continuable | 843 |
| 11 | ext-openswoole | 834 |
| 12 | react-native-worklets-core | 720 |
| 13 | SaneCppLibraries | 588 |
| 14 | Rythe-Engine | 540 |
| 15 | helio | 509 |
| 16 | qcoro | 495 |
| 17 | ipc | 430 |
| 18 | UTL | 319 |
| 19 | areg-sdk | 301 |
| 20 | mysql | 285 |
| 21 | YACLib | 280 |
| 22 | redis | 260 |
| 23 | idle | 210 |
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