fmtlib/fmt
A modern formatting library observed · 2026-10-14
Health v2 · maintenance only
89/100
- Activity 99
- Release rhythm 69
- Longevity 100
How is this computed?
round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10) — computed 2026-10-21. Adoption (stars, forks) is never an input.
- gap_med: 36.0
- age_days: 5065
- days_rel: 126
- days_push: 9
- n_releases_24m: 9
Adoption not part of the score
25882 stars · 3084 forks observed · 2026-10-14
What it is AI-extracted, prompt v1, taxonomy v1, 2026-10-12, confidence 0.99
fmt is a modern C++ formatting library offering a fast, safe alternative to printf and iostreams. It implements the C++20 std::format specification and provides extensive formatting capabilities.
Use cases
- format strings in C++ with positional arguments
- replace printf calls with type‑safe formatting
- implement C++20 std::format or std::print in older compilers
- generate localized messages and logs efficiently
- format floating‑point numbers with correct rounding
When to choose
- You need high‑performance, type‑safe string formatting in C++.
- Your project requires compatibility across Linux, macOS, and Windows.
- You want to use the upcoming std::format API today.
- Unicode support and safe printf functionality are important.
When to avoid
- You need dynamic scripting language formatting features not available in C++.
- Your application relies on heavy runtime reflection for formatting.
- You prefer a logging framework that includes log rotation and output destinations.
Facets
library · maturity active
serialization programming-languages cpp windows cross-platform formatting printf-replacement type-safe fast unicode-support linux macos
2 sources
- readme: https://github.com/fmtlib/fmt · fetched 2026-10-14 · 5102740802e3
- homepage: https://fmt.dev · fetched 2026-09-28 · 1f5ada7b7977
Member repositories
| Repository | Role | Health v2 |
|---|---|---|
| fmtlib/fmt | main | 89 |
For agents
Data as of 2026-10-19T08:05:51.212177+00:00 · Report a problem