JetBrains Fleet was a lightweight, polyglot code editor designed as a modern alternative to traditional JetBrains IDEs, offering a fast startup experience with the ability to scale up to full IDE functionality on demand. It aimed to solve the problem of heavyweight IDEs that are slow to launch for quick editing tasks by providing a lightweight editor that could activate language-specific intelligence when needed. Fleet was built from scratch with a distributed architecture that separated the editor frontend from backend language processing.
Fleet featured Smart Mode that could be toggled on to activate IntelliJ-level code intelligence for any supported language, collaborative editing for real-time pair programming, and integrated terminal and Git support. The editor supported multiple programming languages out of the box without requiring separate IDE installations, and included AI Assistant integration for code generation and chat-based assistance. However, JetBrains announced in December 2025 that Fleet would be discontinued, with no further updates or distribution after December 22, 2025, citing that maintaining two general-purpose IDE families created confusion and diluted focus.
Fleet was aimed at polyglot developers who worked across multiple programming languages and wanted a single, lightweight editor with the option to activate deep language intelligence when needed. While Fleet is no longer actively developed, it represented an important experiment in rethinking IDE architecture. JetBrains has redirected its innovation efforts toward JetBrains Air, a new agentic development environment launched in March 2026 that makes AI agents the primary interface for software development, with the traditional editor serving a supporting role for code review and oversight.
