# Hello Algo > Data structures and algorithms book with animations A free book that teaches data structures and algorithms with animated pictures and code you can run in many languages. - Source: https://github.com/krahets/hello-algo - Homepage: https://www.hello-algo.com - License: NOASSERTION - Built with: Java 16.1%, Swift 16.0%, C++ 15.0%, JavaScript 13.7%, Other 39.2% - Stars: 131638 - Forks: 15569 - Contributors: 212 - Last commit: 2026-10-28 - Latest release: 1.3.0 (2026-01-01) - Purpose: Interview prep - Type: Web, Guide / course - For: Personal ## Worth score: 77/100 How much DigGitHub recommends it, from activity, adoption, docs, license and security signals. - Popularity: 25/25 - Momentum: 10/20 - Maintenance: 21/25 - Community: 14/15 - Readiness: 7/15 ## Downloads Latest release: [Hello 算法 1.3.0](https://github.com/krahets/hello-algo/releases/tag/1.3.0). Files from the project's GitHub release, not checked by DigGitHub. Other files: - [hello-algo_1.3.0_en_c.epub](https://github.com/krahets/hello-algo/releases/download/1.3.0/hello-algo_1.3.0_en_c.epub) (13 MB, 774 downloads) - [hello-algo_1.3.0_en_cpp.epub](https://github.com/krahets/hello-algo/releases/download/1.3.0/hello-algo_1.3.0_en_cpp.epub) (13 MB, 661 downloads) - [hello-algo_1.3.0_en_csharp.epub](https://github.com/krahets/hello-algo/releases/download/1.3.0/hello-algo_1.3.0_en_csharp.epub) (13 MB, 453 downloads) - [hello-algo_1.3.0_en_dart.epub](https://github.com/krahets/hello-algo/releases/download/1.3.0/hello-algo_1.3.0_en_dart.epub) (13 MB, 350 downloads) - [hello-algo_1.3.0_en_go.epub](https://github.com/krahets/hello-algo/releases/download/1.3.0/hello-algo_1.3.0_en_go.epub) (13 MB, 470 downloads) - [hello-algo_1.3.0_en_java.epub](https://github.com/krahets/hello-algo/releases/download/1.3.0/hello-algo_1.3.0_en_java.epub) (13 MB, 579 downloads) - [hello-algo_1.3.0_en_javascript.epub](https://github.com/krahets/hello-algo/releases/download/1.3.0/hello-algo_1.3.0_en_javascript.epub) (13 MB, 409 downloads) - [hello-algo_1.3.0_en_kotlin.epub](https://github.com/krahets/hello-algo/releases/download/1.3.0/hello-algo_1.3.0_en_kotlin.epub) (13 MB, 313 downloads) - [hello-algo_1.3.0_en_python.epub](https://github.com/krahets/hello-algo/releases/download/1.3.0/hello-algo_1.3.0_en_python.epub) (13 MB, 916 downloads) - [hello-algo_1.3.0_en_ruby.epub](https://github.com/krahets/hello-algo/releases/download/1.3.0/hello-algo_1.3.0_en_ruby.epub) (13 MB, 294 downloads) - [hello-algo_1.3.0_en_rust.epub](https://github.com/krahets/hello-algo/releases/download/1.3.0/hello-algo_1.3.0_en_rust.epub) (13 MB, 369 downloads) - [hello-algo_1.3.0_en_swift.epub](https://github.com/krahets/hello-algo/releases/download/1.3.0/hello-algo_1.3.0_en_swift.epub) (13 MB, 318 downloads) - [hello-algo_1.3.0_en_typescript.epub](https://github.com/krahets/hello-algo/releases/download/1.3.0/hello-algo_1.3.0_en_typescript.epub) (13 MB, 385 downloads) - [hello-algo_1.3.0_zh_c.epub](https://github.com/krahets/hello-algo/releases/download/1.3.0/hello-algo_1.3.0_zh_c.epub) (21 MB, 1.9k downloads) - [hello-algo_1.3.0_zh_cpp.epub](https://github.com/krahets/hello-algo/releases/download/1.3.0/hello-algo_1.3.0_zh_cpp.epub) (21 MB, 3k downloads) - [hello-algo_1.3.0_zh_csharp.epub](https://github.com/krahets/hello-algo/releases/download/1.3.0/hello-algo_1.3.0_zh_csharp.epub) (21 MB, 801 downloads) - [hello-algo_1.3.0_zh_dart.epub](https://github.com/krahets/hello-algo/releases/download/1.3.0/hello-algo_1.3.0_zh_dart.epub) (21 MB, 426 downloads) - [hello-algo_1.3.0_zh_go.epub](https://github.com/krahets/hello-algo/releases/download/1.3.0/hello-algo_1.3.0_zh_go.epub) (21 MB, 751 downloads) - [hello-algo_1.3.0_zh_java.epub](https://github.com/krahets/hello-algo/releases/download/1.3.0/hello-algo_1.3.0_zh_java.epub) (21 MB, 1.9k downloads) - [hello-algo_1.3.0_zh_javascript.epub](https://github.com/krahets/hello-algo/releases/download/1.3.0/hello-algo_1.3.0_zh_javascript.epub) (21 MB, 690 downloads) - [hello-algo_1.3.0_zh_kotlin.epub](https://github.com/krahets/hello-algo/releases/download/1.3.0/hello-algo_1.3.0_zh_kotlin.epub) (21 MB, 442 downloads) - [hello-algo_1.3.0_zh_python.epub](https://github.com/krahets/hello-algo/releases/download/1.3.0/hello-algo_1.3.0_zh_python.epub) (21 MB, 4.7k downloads) - [hello-algo_1.3.0_zh_ruby.epub](https://github.com/krahets/hello-algo/releases/download/1.3.0/hello-algo_1.3.0_zh_ruby.epub) (21 MB, 391 downloads) - [hello-algo_1.3.0_zh_rust.epub](https://github.com/krahets/hello-algo/releases/download/1.3.0/hello-algo_1.3.0_zh_rust.epub) (21 MB, 684 downloads) - [hello-algo_1.3.0_zh_swift.epub](https://github.com/krahets/hello-algo/releases/download/1.3.0/hello-algo_1.3.0_zh_swift.epub) (21 MB, 1.9k downloads) - [hello-algo_1.3.0_zh_typescript.epub](https://github.com/krahets/hello-algo/releases/download/1.3.0/hello-algo_1.3.0_zh_typescript.epub) (21 MB, 617 downloads) - [hello-algo_1.3.0_zh-hant_c.epub](https://github.com/krahets/hello-algo/releases/download/1.3.0/hello-algo_1.3.0_zh-hant_c.epub) (21 MB, 311 downloads) - [hello-algo_1.3.0_zh-hant_cpp.epub](https://github.com/krahets/hello-algo/releases/download/1.3.0/hello-algo_1.3.0_zh-hant_cpp.epub) (21 MB, 357 downloads) - [hello-algo_1.3.0_zh-hant_csharp.epub](https://github.com/krahets/hello-algo/releases/download/1.3.0/hello-algo_1.3.0_zh-hant_csharp.epub) (21 MB, 288 downloads) - [hello-algo_1.3.0_zh-hant_dart.epub](https://github.com/krahets/hello-algo/releases/download/1.3.0/hello-algo_1.3.0_zh-hant_dart.epub) (21 MB, 265 downloads) ## Alternatives - [JavaScript Algorithms](https://diggithub.com/trekhleb/javascript-algorithms.md): Algorithms and data structures in JavaScript - [Coding Interview University](https://diggithub.com/jwasham/coding-interview-university.md): Study plan for software engineering interviews - [doocs LeetCode](https://diggithub.com/doocs/leetcode.md): LeetCode solutions in many programming languages - [Tech Interview Handbook](https://diggithub.com/yangshun/tech-interview-handbook.md): Coding interview prep for busy engineers --- Source page: https://diggithub.com/krahets/hello-algo Updated: 2026-10-29