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Meet twinBASIC — the next evolution of classic BASIC.

Crafted from scratch for total VB6 compatibility, twinBASIC lets you open your existing projects and run them unchanged, then take them further with modern-day language features and performance gains.
  • True to its roots. Every VB6/VBA quirk is faithfully reproduced, so nothing gets lost in translation.
  • A foundation that’s getting stronger every day. The compiler and debugger are still in active development, but each beta release brings sharper stability and more polish.
  • Built for progress. Enjoy 64-bit support and continual quality-of-life enhancements that push BASIC forward without breaking what already works.
  • A purpose-built in-house developed IDE. Our streamlined environment accelerates coding, debugging, and deployment—so you can ship faster.
Since the public BETA debut on 9 April 2021, we’ve delivered hundreds of updates, shipped dozens of new features, and squashed more bugs than we can count—and we’re only just getting started.

Keep your code. Level-up your possibilities. Welcome to twinBASIC.

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GitHub Issue Tracking

IDE features

  • Semantic highlighting
  • Real-time full project error and diagnostics panel
  • Intellisense, code completion and signature help
  • Goto definition
  • Code folding
  • Tabbed document editing
  • Custom add-ins support
  • Uses the modern standard LSP protocol

Debugger features

  • Multi-thread debugging capability
  • Callstack window
  • Variables window
  • Watch window
  • Debug console (aka 'Immediate Window')
  • Uses the modern standard DAP protocol

Compiler features

  • Designed to be 100% compatible with existing VB6 and VBA code, simulating all known quirks
  • Compiles to Win32 and Win64 architectures, with Mac, Linux, and Android support planned
  • Supports many VB6 project types such as 'Standard EXE', 'ActiveX Control', and 'ActiveX DLL'
  • Adds support for new project types, including 'Standard DLL' (non-ActiveX)
  • Fully based on COM technologies, like the classic versions of Visual Basic
  • Generates small executables that do not require runtime libraries or redistributable components
  • Full Unicode support throughout (IDE -> parser -> compiler -> standard library)
  • Supports parameterized class constructors (for non-exposed classes)
  • Generics support, similar to VB.NET but more flexible
  • Supports overloading, with rules consistent with VB.NET
  • Multi-threading support, with a fully thread-safe standard library
  • New built-in controls: WebView2 and QRCode
  • New datatypes: LongLong (for both Win32 and Win64), LongPtr, Decimal
  • New operators: AndAlso, OrElse, <<, >>
  • New assignment operators: +=, -=, *=, \=, /=, ^=, &=, <<=, >>=
  • New statements: Continue For, Continue While, Continue Do, Exit While
  • Supports Return syntax, similar to VB.NET
  • Per-procedure Handles/Implements event syntax, as seen in VB.NET
  • DeclareWide support for using Strings in Unicode DLL calls (disables implicit ANSI conversions)
  • Entire compilation process is multi-threaded for excellent performance
  • Allows multiple components per source file (within Class/Module blocks)
  • Brand new custom parser (written in C++), built for flexibility and high performance
  • Removes many legacy limitations, such as the size of procedures and number of line continuations
  • Designed for LLVM, paving the way for full optimized compilation and superior runtime performance

Built-in extension libraries

  • (COMING SOON) vbWatchdog: a native implementation of vbWatchdog (ErrEx) for fantastic error handling possibilities

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