Top 7 C++ range Projects

{fmt}

1 176 23,541 9.6 C++

A modern formatting library

Project mention: Floating-Point Printing and Parsing Can Be Simple and Fast | news.ycombinator.com | 2026-01-20

It is possible to compress the table using the technique from Dragonbox (https://github.com/fmtlib/fmt/blob/8b8fccdad40decf68687ec038...) at the cost of some perf. It's on my TODO list for zmij.
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less_slow.cpp

2 11 1,913 9.4 C++

Playing around "Less Slow" coding practices in C++ 20, C, CUDA, PTX, & Assembly, from numerics & SIMD to coroutines, ranges, exception handling, networking and user-space IO

Project mention: Processing Strings 109x Faster Than Nvidia on H100 | news.ycombinator.com | 2025-09-19

Yes, at the scale of 128-bit registers NEON is mostly enough, except for a few categories of instructions missing in that ISA subset, like scatter/gather ops, that can yield 30% boost over serial memory accesses: https://github.com/ashvardanian/less_slow.cpp/releases/tag/v...
scnlib

3 18 1,313 8.4 C++

scanf for modern C++
flux

4 8 742 6.3 C++

A C++20 library for sequence-orientated programming (by tcbrindle)

Project mention: The Road to Flux 1.0 | news.ycombinator.com | 2025-10-23
think-cell-library

5 2 457 4.0 C++

think-cell core library
text

6 10 335 6.3 C++

A spicy text library for C++ that has the explicit goal of enabling the entire ecosystem to share in proper forward progress towards a bright Unicode future. (by soasis)
words-counter-benchmarks-game

7 1 17 1.8 C++

A words counter with multiple implementations and benchmarks for each implementation

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++ ranges discussion

C++ ranges related posts

The Road to Flux 1.0

1 project | news.ycombinator.com | 23 Oct 2025
C++20 – Back to the Future Meta-Programming

2 projects | news.ycombinator.com | 15 Jul 2024
Why are strings and IO so complicated?

13 projects | /r/cpp | 7 Dec 2023
Memory Allocation

1 project | /r/coding | 6 Jul 2023
How to filter tuple at compile time, by values of its elements (instead of types) ?

2 projects | /r/cpp | 8 Sep 2022
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Index

What are some of the best open-source range projects in C++? This list will help you:

#	Project	Stars
1	{fmt}	23,541
2	less_slow.cpp	1,913
3	scnlib	1,313
4	flux	742
5	think-cell-library	457
6	text	335
7	words-counter-benchmarks-game	17

C++ ranges

Top 7 C++ range Projects

C++ ranges discussion

C++ ranges related posts

The Road to Flux 1.0

C++20 – Back to the Future Meta-Programming

Why are strings and IO so complicated?

Memory Allocation

How to filter tuple at compile time, by values of its elements (instead of types) ?

Index

Did you know that C++ is the 7th most popular programming language based on number of references?

Did you know that C++ is
the 7th most popular programming language
based on number of references?