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Microsoft’s C# has won the Tiobe Index Programming Language of the Year designation for the second time in three years, with the largest year-over-year increase in ranking in the company’s programming language popularity index. Meanwhile, another Microsoft language, TypeScript, may crack the index’s top 20 this year, according to Tiobe CEO Paul Jansen.
Tiobe announced C# as its language of the year for 2025 on January 4. C# rose 2.94 percentage points year over year, with a rating of 7.39% and ranking of fifth this month. C#’s winning the award had been expected; the language was also Tiobe’s language of the year for 2023. “From a language design perspective, C# has often been an early adopter of new trends among mainstream languages,” wrote Paul Jansen, CEO of the software quality services vendor, in a bulletin accompanying the January 2026 index. “At the same time, it...