IEEE Spectrum 2021 Programming Language Rankings: Python’s Continued Dominance and C#’s Surge

IEEE Spectrum released its 2021 programming language ranking, confirming Python’s continued dominance by holding the number‑one position in the overall list and several sub‑rankings. The study aggregated data from eight sources—CareerBuilder, GitHub, Google, Hacker News, IEEE, Reddit, Stack Overflow, and Twitter—using eleven metrics to assess language popularity.

The ranking categorises languages into four types (Web, Enterprise, Mobile, Embedded) and presents five ranking dimensions: overall, trending, jobs, open‑source, and custom. In the top‑10 overall list, Python, Java, C, C++, and JavaScript remain unchanged from 2020, while notable shifts occur from positions 6 to 10: Arduino and Matlab fall out, HTML enters, and C# rises dramatically to 6th place.

In the trending ranking, Python again leads, followed by Java, C, JavaScript, C++, Go, R, HTML, C#, and SQL. Languages such as Arduino, Dart, and Swift that were in the 2020 top‑10 are replaced by R, C#, and SQL.

The job‑market ranking shows Python as the most in‑demand language, with C in second place, followed by Java, JavaScript, and C++. Swift, which ranked in the 2020 top‑10, is now overtaken by C#.

For open‑source projects, Python remains the favourite, while C# replaces Arduino among the top‑10.

An analysis of C# explains its rapid ascent: created in 2000 as a lightweight alternative to C++, it became a primary language for Windows‑based commercial applications, benefitting from recent releases (C# 9.0) and the upcoming Windows 11, as well as growing interest in distributed systems.

The article concludes with the full ranking chart and reference links to the original IEEE Spectrum report and additional commentary on C#’s future.