Mainswift

Mainswift is a high-performance programming language and runtime designed for scripting tasks that run on the main thread of applications with real-time constraints. It combines a safety-focused static type system with a fast native backend and a syntax influenced by modern languages such as Swift and Python.

Mainswift originated in a community-driven effort in the early 2020s. The project released its first stable version, 1.0, in 2022, followed by regular updates and cross-platform targets including Windows, macOS, Linux, and embedded environments. It is maintained as an open-source project with contributions from individuals and small organizations.

Features: Mainswift compiles to native code via LLVM-based backend. It provides a statically typed system with memory safety features, optional reference management, and support for async/await and cooperative multitasking. The language emphasizes small runtime overhead, predictable performance, and straightforward C interop through a foreign-function interface.

Syntax and tooling: The language offers a readable syntax with Swift-like constructs and minimal boilerplate. Toolchain includes a compiler, package manager, linter, debugger, and a standard library. Interoperability with C and Swift enables integration into existing codebases.

Use cases and adoption: Common use cases include UI scripting in desktop and mobile apps, game logic, and lightweight embedded controllers where main-thread performance matters. The ecosystem remains modest, with a growing set of libraries and sample projects.

Reception and status: It has been praised for speed and safety, but criticized for a smaller ecosystem and learning curve for developers used to more established languages. As of 2024–2025, it remains a niche tool with ongoing development.