---
id: ua-parser-builtins
version: "202606"
license: Apache 2.0
license_treatment: permissive
maintenance: active
---

# ua-parser-builtins — Precompiled rules for User Agent Parser

License: permissive · Maintenance: active · Popularity: top 1,000 on PyPI

## Install

pip install ua-parser-builtins
uv add ua-parser-builtins
poetry add ua-parser-builtins

## Description

# Precompiled ruleset for [ua-parser]

This project does not do anything on its own, nor does it have any
actual API: it contains the dataset of [uap-core] pre-compiled for use
by [ua-parser] to decrease
initialisation times.

The precompiled ruleset is released monthly based on whatever
[uap-core]'s default branch is at that moment. The [uap-core] commit
used for creating the compiled ruleset is stored in the `REVISION`
file at the root of the wheel.

[ua-parser]: https://pypi.org/project/ua-parser/
[uap-core]: https://github.com/ua-parser/uap-core

## AI interpretation — verify before relying

Provides precompiled user-agent parsing rules to decrease initialization times when used with ua-parser.

Verdict: A lightweight, actively maintained data package released monthly that accelerates ua-parser initialization. No vulnerabilities, permissive Apache 2.0 license, and broad Python version support (3.10–3.14) make it a low-risk dependency.

[View on SkillFed](https://skillfed.io/packages/ua-parser-builtins) · [View on PyPI](https://pypi.org/project/ua-parser-builtins/)