Top 9 C Unicode Projects

utf8.h

1 2 1,905 4.9 C

📚 single header utf8 string functions for C and C++
Stream

getstream.io featured

Stream - Scalable APIs for Chat, Feeds, Moderation, & Video. Stream helps developers build engaging apps that scale to millions with performant and flexible Chat, Feeds, Moderation, and Video APIs and SDKs powered by a global edge network and enterprise-grade infrastructure.
Tehreer-Android

2 0 92 7.4 C

Standalone text engine for Android aimed to be free from platform limitations
vastringify

3 1 72 3.2 C

Type-safe Printf in C
unicorn

4 4 65 7.3 C

Unicode® algorithms on a chip. Compliant with MISRA C:2012. (by railgunlabs)

Project mention: How SQLite Is Tested | news.ycombinator.com | 2025-12-17

> It never occurred to me that this was a possibility
Yes, it's viable. I do it for my companies projects in addition to dual-licensing under the GPL. See "The unit tests and Unicode data generators are not public. Access to them is granted exclusively to commercial licensees." [1].
[1] https://github.com/railgunlabs/unicorn?tab=readme-ov-file#li...
ocreval

5 1 59 0.0 C

Update of the ISRI Analytic Tools for OCR Evaluation with UTF-8 support
libtexprintf

6 1 47 7.1 C

Library providing printf-style formatted output routines with tex-like syntax support.
icu_ext

7 1 32 4.4 C

PostgreSQL extension (in C) to expose functionality from the ICU library
InfluxDB

www.influxdata.com featured

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.
nuru

8 1 16 0.0 C

Binary file format for ASCII/ANSI art. (by domsson)
STB-Style-Single-File-C-CPP-JSON-Parser-Generator-Header-Only-Library-With-Full-RFC-Compliance

9 1 6 3.1 C

Lightweight single-header JSON parser/generator for C/C++ in STB tradition. Implements RFC 8259 (JSON), RFC 6901 (JSON Pointer), RFC 6902 (JSON Patch), and RFC 7386 (Merge Patch). Zero dependencies, thread-safe, UTF-8 validation, file I/O, minification, and custom allocators. Ideal for embedded systems and cross-platform projects.

Project mention: Show HN: Stb_JSON header only JSON parser for C/C++ | news.ycombinator.com | 2025-09-10

GitHub: https://github.com/Ferki-git-creator/STB-Style-Single-File-C...
Lightweight single-header JSON parser/generator for C/C++ in STB tradition. Implements RFC 8259 (JSON), RFC 6901 (JSON Pointer), RFC 6902 (JSON Patch), and RFC 7386 (Merge Patch). Zero dependencies, thread-safe, UTF-8 validation, file I/O, minification, and custom allocators. Ideal for embedded systems and cross-platform projects.

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 Unicode discussion

C Unicode related posts

How SQLite Is Tested

2 projects | news.ycombinator.com | 17 Dec 2025
The C23 edition of Modern C is now available for free

5 projects | news.ycombinator.com | 15 Oct 2024
Latest intl and icu versions cause "breaking change" with Canadian currency display

2 projects | /r/PHPhelp | 30 Dec 2022
Where to start on a specific project, new to coding.

1 project | /r/learnprogramming | 3 Apr 2021
ideas for a course project?

1 project | /r/C_Programming | 21 Dec 2020
A note from our sponsor - InfluxDB
www.influxdata.com | 24 Dec 2025

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. Learn more →

Index

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

#	Project	Stars
1	utf8.h	1,905
2	Tehreer-Android	92
3	vastringify	72
4	unicorn	65
5	ocreval	59
6	libtexprintf	47
7	icu_ext	32
8	nuru	16
9	STB-Style-Single-File-C-CPP-JSON-Parser-Generator-Header-Only-Library-With-Full-RFC-Compliance	6