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Top Features

Type Analysis & Enhanced Code Completion

Real-time and lag free. The VAST IDE's tools speed up your workflow and reduce the likelihood of bugs making it to production. 

Live refactoring tools further improve the process and keep you focused on the task at hand.
Type Analysis example
Futures and Promises framework example

Asynchronous Programming

Creating complex asynchronous behaviors is easier with VAST's best-in-class futures/promises framework, plus asynchronous streams and zones, inspired by similar functionality from the Dart programming language.

Multi-CPU Capable with FFI & OsProcess

Whether using native threads, or OS processes, take advantage of multiple processors by using VAST's multi-threaded foreign function interface (FFI) or our OsProcess framework.
OsProcess code example using Ruby, Dart, Python, and Smalltalk
Unicode inspectors in use

Advanced Unicode Capabilities

VAST brings a truly ergonomic Unicode experience to Smalltalk. We went beyond "basic" Unicode support, and instead designed an advanced implementation that focused on "Unicode Correctness" and performance.
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Language & Runtime

LLVM Compiler

State-of-the-art virtual machine technology utilizing the well-known LLVM compiler infrastructure for fast just-in-time (JIT) compilation.

VisualAge Smalltalk Compatible

Compatible with IBM® VisualAge® Smalltalk enabling fast and easy migration and upgrades.

Native Interface Support

Native interface support provides platform-adapting object wrappers to facilitate the generation of native binding.


Choose whichever processor architecture best suits your intended application or use case: Intel®/AMD® or ARM® on both Windows® and Linux®.

Asynchronous Calls

Bi-directionally communicate with other application threads both efficiently, and of course, safely too.

SIMD Optimizations

Usage of SIMD algorithms dramatically improve the speed of certain lower-level operations.
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Core Libraries

OsProcess Framework

Use our consistent and cross-platform set of abstractions to  accomplish object-oriented systems programming tasks with ease.

Futures/Promises Framework

A true asynchronous program experience is possible. Programming complex, task-centric behaviors has never been easier or more succinct. A+ spec compatible.

Asynchronous Streams

Gather data and/or events that can be used along with our futures/promises framework.

Asynchronous Zones

Effortlessly control, monitor, and share data between asynchronous activities within your program.

Foreign Function Interface (FFI)

Access external C language libraries to get even more functionality out of your VAST-based system.
Unicode Examples

Unicode Support Library

Work with all the world's languages, symbols, and emojis using the latest Unicode standard.

Rich Date/Time Interface

Access and manipulate historical date and time information in a timezone-aware interface. Uses the IANA Time Zone Database.

Integrated Compression

Unified compression API support for Zip, Zip64, Brotli, Lz4, Zstd, and Gzip for increased software performance and reduced memory footprints.

Logging Framework

Logging framework provides rich, customizable support for creating development time, runtime, and rolling logs, with the ability to log to a socket, a file, or memory.
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Development Tools

Advanced Code Editing

A code editor for true polyglots supporting code highlighting in 25+ languages including C, C++, Python®, JavaScript®, Swift™, Go™, Rust™, etc. with fully customizable color theming and linting.

Development Browsers

Best-in-class debuggers, code management browsers, inspectors, a performance monitor, code reporting tools, unit testing browsers, and linters.


VAST has two GUI builders to help visually build your application: WindowBuilder Pro™ and Abt Parts. Choose whichever one works best for your workflow.

Code Completion Tools

As you're coding, these tools contextually analyze your code and provide the most appropriate suggestions.
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VAST Environments

Smalltalk image manager and launcher to help efficiently handle multi-image workflows in VAST.

Real-time Code Analysis

Monitors code as you type to provide hints about errors, warnings, and optimization opportunities.

Live Refactoring Tools

Realtime visual tooling helps expedite the restructuring of your code for better maintainability.
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User Interface & Visuals


Hi DPI support in Windows®-based environments provides crisp graphics on modern device screens.

Native Widgets

Native widgets provide a familiar look-and-feel for Windows and Linux® without the need to make platform dependent code.

Emulated Widgets

Most needs can be satisfied with native widgets, but emulated widgets help fill in the gaps and allow you to completely take control of the look and feel of your user interface.

Graphic Acceleration

DirectWrite and GPU acceleration are utilized within the editors on Windows.
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Communications & Networking

Web Services Tools

A self-contained, modular framework for accessing and hosting Web Services with tools for creating and deploying them.

Server Smalltalk (SST)

SST is a flexible communications framework that is the foundation of many VAST protocol implementations including distributed garbage collection, logical processes, web services, HTTP, SMTP, and IMAP.

Network Protocol Support

Powerful HTTP/HTTPS, IMAP, SMTP, FTP/FTPS, IBM MQ series, MQTT, and LDAP/LDAPS clients are all included for superior connectivity with a powerful sockets API including full support for TCP/IP V4/V6 protocols.

External Interface Support

Support for JSON, XML, CSV, COM (OLE, ACTIVEX), and STON (Smalltalk Object Notation). STON provides a lightweight text-based, human-readable data interchange format for class-based languages.

Streamed HTTP Retrieval

Using our asynchronous streams functionality, retrieve large pieces of streamed HTTP content, and asynchronously process these large files in smaller pieces for improved efficiency.

MQTT Client

MQTT is a lightweight communication protocol that’s a close relative of IBM® MQSeries. Support for version 3, 3.11, and 5 protocols are included, and asynchronous streams are already integrated for easy consumption of publish/subscription updates.
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Web Technologies

Integrated Web Technology

Inclusion of the Seaside web framework, REST, jQuery, AJAX, and several other web development technologies and tools will get your web project off the ground quickly.


Microsoft Edge’s WebView2 framework allows embedding web content into VAST native applications and building hybrid systems with bi-directional control.
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Relational DB Support

Use Oracle, DB2, PostgreSQL, SQLite database drivers (as well as ODBC) that take advantage of RDBMS (Relational Database Management Systems). Now with Unicode support.

Object Relational Mapping

Combine relational databases with our ORM (Object Relational Mapper): GLORP.  Now with Unicode support.

Object-Oriented DB Support

Match the purely object-oriented approach of Smalltalk with a similar database structure. VAST is compatible with object-oriented databases, like GemStone/S.
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Object Oriented Wrapper

As part of our OpenSSL® 3.0 implementation, VAST has an high-level object oriented wrapper around OpenSSL that's easy to use, and backward compatible with previous versions of 0.9.8 through 1.1.x.  

SSL/TLS Modules

VAST incorporates Secure Sockets Layer (SSL) and TLS v1.3 technology which provide industry-standard security over computer networks.

FIPS Module

Access OpenSSL's collection of a compliant algorithms used meet the FIPS 140 standard.
(Anticipated acceptance of OpenSSL's compliance by NIST by Q3/Q4 2022.)

X509 Support

VAST provides the ability to identify and secure internet communications with public key certificates using the X509 standard.

Message Digests

Access a wide range of cryptographic hash functions designed to protect the integrity of data, like the SHA family, SHAKE, and BLAKE2.

Message Authentication Codes

In addition to data integrity, like message digests, MAC also provide authentication. VAST supports message authentication codes like GMAC, KMAC, Poly1305, and Siphash.


VAST supports authenticated symmetric encryption, and various public key cryptography algorithms to encrypt and decrypt sensitive data.

Key Derivation

Improve security by deriving new secure keys from weaker plain text sources. Key derivation is frequently used in password storage and securing. Algorithms like Scrypt, PBKDF2, and HKDF are available.

Secure Memory Arenas

Use special, guarded sections of memory to help obscure and protect sensitive key material, for both Windows and Linux with OpenSSL 3.0.

Secure RNG

A cryptographically strong random number generator using native OS capability is available that has a high entropy.


By leveraging OpenSSL® capabilities, LDAPS over standard SSL/TLS protocols is possible.
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Version Control

ENVY Version Control

Unmatched version control. Store and compare all software components down to the method level.

Git Friendly

VAST has Git-friendly integrated tooling named Tonel Tools. It's easy to use projects from our GitHub and the VAST Community Hub as well as code from private and public repositories.
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Cross Platform Development

XD Server Workbench is a cross-development environment used in developing distributed processing, web hosting, and other server applications. Target deployment environments include all VAST development platforms.


VAST's packager creates runtime images composed of only the necessary classes which results in a stripped down runtime image that can be less than 1MB.

Dependency Analysis Tools

Detect dependencies within methods and classes while you're coding, and help organize your system to define the smallest usable parts when packaging for small runtime deployment.

Automated Build Support (ABS)

Streamline your build workflow and automate tasks when packaging your application. Functionality is exposed through a scriptable interface.

Additional Resources

Discover new possibilities with VAST.

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