4D 21 LTS is Here

4D 21 LTS, the most feature-rich version of 4D to date, is now available.

Over the past two years, 4D has moved forward at an exceptional pace. Feature releases introduced major foundations across AI, networking, security, data modeling, web integration, and developer tooling. These innovations were not isolated improvements. They reshaped how applications are built, extended, and maintained over the long term.

Download 4D 21 LTS Now 

Now, with 4D 21 LTS, all of this momentum converges into a Long-Term Support release designed for stability, scale, and long-term production use. This is the version where innovation settles, performance solidifies, and new patterns become reliable building blocks for your applications.

This release brings together:

• A native AI engine with vectors, semantic queries, and AI driven workflows built directly into the language and ORDA
• A modernized networking stack with QUIC, secure TCP and UDP APIs, HTTP agents, and WebSocket clients
• A stronger data layer with lifecycle events, typed object fields, stable selections, and incremental synchronization
• A faster path to the web with 4D Qodly Pro, visual UI building, shared sessions, roles, and built in i18n
• A redesigned component ecosystem with GitHub based dependency management and in project editing
• Major advances in 4D Write Pro and 4D View Pro for document automation, performance, and scale
• Stronger security defaults with Force Login, improved TLS handling, certificate validation, and session visibility
• A modernized language with clearer syntax, structured error handling, singletons, and real time validation
• Smarter code and form editors with configurable warnings, deprecated API detection, and form syntax checking
• Deeper Visual Studio Code integration with formatting, analysis, and debugging
• UI refinements that improve usability, customization, and collaboration in version controlled projects

This is just a glimpse of what’s new in 4D 21 LTS. Get started by downloading 4D 21 LTS and dive into each feature with detailed blog posts.