ANTLR

Developer Tools / Parser Generatorantlr.org

ANTLR is a free, open-source parser generator that converts .g4 grammar files into parsers for Java, C#, and C++. It serves software developers and enterprise engineering teams that build languages, tools, query parsers, and structured-data applications, with no commercial revenue model.

Company typePrivate
Founded1992
HeadquartersSan Francisco, United States
Headcount1–10
GTM typeB2B
OfferingSoftware

What ANTLR does

ANTLR (ANother Tool for Language Recognition) is an open-source parser generator project originated by Terence Parr, with copyright dating to 1992 and conceptual roots in his language-tools work beginning in 1989. The system takes grammar specifications written in .g4 files and generates parsers that can build and walk parse trees; its core engine is based on Augmented Transition Network (ATN) parsing, with notable technical features including direct left-recursion handling, an XPath-like syntax for identifying nodes in parse trees, and a listener/visitor pattern for tree traversal. The product suite comprises ANTLR v4 (the core generator), ANTLR Lab (an online experimentation environment launched at lab.antlr.org), runtime libraries for Java, C#, and C++, and an official Apache Maven plugin for build automation.

ANTLR serves two overlapping user groups: software developers building languages, tools, compilers, interpreters, or domain-specific languages, and enterprise engineering teams that need reliable parsing at scale for production workloads such as search-query parsing or structured-data processing. Notable named users include Twitter, which stated in a featured testimonial that it uses ANTLR exclusively for query parsing in Twitter search, and Google, where the maintainer is employed as a tech lead and where ANTLR is used internally for various projects. The project is distributed globally as free software through pip (antlr4-tools), the official Maven plugin, the antlr/antlr4 GitHub repository, and direct downloads of runtime APIs, with adoption driven by community contributions, the grammars-v4 repository of hundreds of example grammars, and published reference works including The Definitive ANTLR 4 Reference.

The business model is purely open-source with no commercial revenue, no pricing tiers, and no licensing fees. Development is sustained by volunteer contributions and the work of Terence Parr, who is a tech lead at Google and was a professor of data science and computer science at the University of San Francisco until 2022. The company is classified as private, headquartered in San Francisco, with 1-10 employees listed; there is no evidence of institutional investment, venture funding, a parent company, or a formal commercial entity structure.

ANTLR firmographics

Firmographics

Name: ANTLR
Legal name: ANTLR
Website: https://antlr.org
Company type: Private
Founded year: 1992
Operating status: Operating
Headcount range: 1–10 employees
Short description: ANTLR is a free, open-source parser generator that converts .g4 grammar files into parsers for Java, C#, and C++. It serves software developers and enterprise engineering teams that build languages, tools, query parsers, and structured-data applications, with no commercial revenue model.
Ownership category
akta.pro rank

ANTLR industry classification

Industry

Product category: Developer Tools / Parser Generator
NAICS: Software Publishers (513210)
SIC: Services-Prepackaged Software (7372)
akta.pro primary industry: GraphQL, gRPC & Modern API Protocols (BPAMAOAK)

Keywords

Parser generator
Language recognition
Grammar parsing
Compiler tools
Domain-specific languages

Where ANTLR is headquartered

Location

Headquarters

HQ city: San Francisco
HQ country: United States
HQ region: North America

Offices1 record

Markets served

ANTLR business model

Business model

GTM type: B2B
Offering type: Software
Cost components: Personnel, Technology or R&D, Operations

Revenue model

Open Source (Free): ANTLR is free and open-source. No commercial revenue model exists. Development is supported by volunteer contributions and the work of Terence Parr.

Go-to-market motion1 record

Distribution channels4 records

Marketing channels5 records

ANTLR product offering

Product offering

Core offering

ANTLR (ANother Tool for Language Recognition) is a free, open-source parser generator that reads, processes, executes, or translates structured text or binary files. From a grammar definition in a .g4 file, ANTLR generates a parser capable of building and walking parse trees. It produces runtime libraries for multiple target languages (Java, C#, C++) and ships an online ANTLR Lab for grammar experimentation.

Product overview

ANTLR (ANother Tool for Language Recognition) is a parser generator toolkit with a modular product architecture. The core offering is the ANTLR v4 parser generator, which takes grammar specifications and generates parsers that can build and walk parse trees. The product suite includes ANTLR Lab for online grammar testing and experimentation, and runtime libraries for Java (4.13.2), C#, and C++ that execute the generated parsers. Build integration is provided via an official Apache Maven plugin. The tool is primarily used for building programming languages, domain-specific languages (DSLs), and language parsing tools.

Differentiator

Problem solved

Functional benefit

Products and services

ANTLR v4 (ANother Tool for Language Recognition)
ANTLR Lab
ANTLR v4 Java Runtime
ANTLR v4 C# Runtime
ANTLR v4 C++ Runtime
ANTLR v4 Java Tool API

Companies that use ANTLR

Customer profile

Named customers5 records

Segments2 records

Ideal customer profiles2 records

ANTLR technology and API

Technology

Technology focussed Yes

API detail

Has API: No
API docs
API detail

Core technology

AI maturity

App detail

Integration1 record

Feature6 records

ANTLR partnerships and signals

Strategic signal

Scale indicators1 record

Recent moves5 records

Expansion highlights4 records

ANTLR competitors and assessment

Company assessment

Direct peers

Tree-sitter: Tree-sitter is a parser generator and incremental parsing library widely used for code editor tooling. It directly competes with ANTLR in the parser generation space with a focus on fast, incremental parsing for syntax highlighting and code navigation.
GNU Bison: Bison is a longstanding parser generator in the GNU project, historically paired with Flex for lexer generation. It is a direct alternative to ANTLR for grammar-based parser generation, particularly in C/C++ toolchains.
PLY (Python Lex-Yacc): PLY is an implementation of lex and yacc for Python, providing parser generation tools specifically for the Python ecosystem. It serves similar use cases to ANTLR for developers building language tools in Python.

Emerging players

Coco/R: Coco/R is a compiler generator that creates scanners and parsers from attributed grammars, supporting multiple target languages. It is a niche competitor to ANTLR in the compiler construction tooling space.
Lark: Lark is a Python parsing toolkit that can parse any context-free grammar using Earley or LALN parsers. It is an emerging alternative to ANTLR for Python developers needing parser generation capabilities.
Peggy: Peggy (successor to PEG.js) is a simple parser generator for JavaScript based on parsing expression grammar. It serves as a lightweight alternative to ANTLR for JavaScript developers building parsers and DSLs.
Rats!: Rats! is a parser generator that combines the simplicity of parser combinators with the efficiency of parsers generated by tools like ANTLR. It is a niche alternative for Java developers needing parser generation.
JFlex: JFlex is a lexical analyzer generator for Java that pairs with parser generators like CUP or BYACC/J. It is part of the broader Java parser toolchain ecosystem that overlaps with ANTLR's Java ecosystem.

Broad incumbents

JetBrains MPS: JetBrains MPS is a commercial language workbench for creating domain-specific languages. While broader than ANTLR, it competes in the DSL and language tooling space with commercial backing and IDE integration.
Xtext: Xtext is an Eclipse-based framework for developing programming languages and domain-specific languages. It competes with ANTLR in the DSL tooling space with strong IDE integration and a broader language engineering platform.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat5 records

Key risks4 records

Key highlights7 records

Customer concentration

ANTLR financial estimates

Financial estimate

Revenue estimate

Valuation estimate

ANTLR leadership team

Management profile

Number of profiles

Profiles1 record

ANTLR funding detail

Funding detail

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

ANTLR M&A and investment

M&A and investment

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about ANTLR

What does ANTLR do?

Is ANTLR a public or private company?

ANTLR is a private company. It is classified as founder individual operated bootstrapped and is currently operating.

When was ANTLR founded?

ANTLR was founded in 1992. It employs 1 to 10 people.

Where is ANTLR based?

ANTLR is headquartered in San Francisco, United States, in the North America region.

How does ANTLR make money?

One revenue line is on record: open Source (Free).

Who are ANTLR's main competitors?

Direct peers on record are Tree-sitter, GNU Bison and PLY (Python Lex-Yacc). Emerging players are Coco/R, Lark, Peggy, Rats! and JFlex. Broad incumbents are JetBrains MPS and Xtext.

Does ANTLR have an API?

No public API is recorded for ANTLR.

What industry is ANTLR in?

ANTLR's product category is Developer Tools / Parser Generator. Its primary akta.pro industry code is BPAMAOAK, GraphQL, gRPC & Modern API Protocols. Its NAICS code is 513210 and its SIC code is 7372.