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BAML

Free#28 of 49 in LLM Application Development Frameworks

BAML: A developer-focused framework for typed LLM outputs, prompt testing, and tool loops. Ranked #28 of 49 in LLM Application Development Frameworks by our editors (6.6/10); pricing: Free plan; best for typed LLM functions and prompt testing.

6.6/10Editor score
Visit BAML
BAML6.6 Visit BAML

At a glance

  • Editor score
    6.6 / 10
  • Pricing
    Free plan
  • Best for
    Typed LLM functions and prompt testing
  • Free plan
    Yes
  • Paid from
    None
  • RAG support
    Yes
  • Facts checked
    28 Sep 2026

  • Where it wins

    • Generates type-safe clients for Python, TypeScript, Go, Ruby, and Rust
    • Supports streaming, retries, RAG patterns, and multi-tool agent loops
    • Includes prompt evaluation and a beta for GEPA-based prompt optimization

  • Where it doesn't

    • Does not provide workflow graphs
    • Lists no integrations
    • GEPA-based prompt optimization is in beta

Our verdict on BAML

BAML is an open-source language and toolchain for developers building LLM applications that need structured, type-safe outputs. Teams define functions, schemas, and prompts in its domain-specific language, then generate clients for Python, TypeScript, Go, Ruby, and Rust. Its intended uses include agents, chatbots, and extraction pipelines, making it a fit for developers who want typed LLM functions and prompt testing within their application code.

The product’s focus is function and schema definition rather than visual workflow orchestration. Generated clients support type-safe parsing, retries, and streaming; the documentation also covers retrieval-augmented generation patterns, tool selection, and multi-tool agent loops. Prompt testing and evaluation are included, alongside GEPA-based programmable prompt optimization marked beta. VS Code and Cursor integrations provide a playground, syntax highlighting, and previews, while a local REST API server can expose BAML functions. These capabilities suit teams building around typed calls and agent logic, but the absence of workflow graphs may make a graph-oriented framework a better fit for developers who want to model flows visually.

According to the vendor’s pricing page, BAML is free and open source, runs on the user’s machine, and cloud features are forthcoming. It is listed under the Apache-2.0 license, with self-hosted deployment and community and documentation support. That combination can work for solo developers through enterprise teams that prefer local development and open-source tooling. Buyers seeking a published paid cloud tier or a listed integration ecosystem should compare alternatives; BAML’s described strengths center on its language, generated clients, editor tooling, and evaluation workflow.

BAML pricing

Plans Free planFree Free to use — no paid tier required for the core job.
See plans on boundaryml.com

BAML fact sheet

Free planYes
Paid fromNone
Primary languageMulti-language
RAG supportYes
Agent and tool useYes
Workflow graphsNo
Prompt optimizationYes
Open-source licenseApache-2.0
JavaScript/TypeScript SDKYes
DeploymentSelf-hosted
PlatformsWeb
SupportCommunity, Docs
Built forSolo, Small business, Mid-market, Enterprise (editorial estimate)
PricingFree plan (source)
Websiteboundaryml.com
Facts checked28 Sep 2026

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Featured on iTechGuides

Featured on iTechGuides — BAML 6.6/10

BAML is listed in our LLM Application Development Frameworks directory. Add the badge to your site — it links back to this page.

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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

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