ua-parser-builtins
Precompiled rules for User Agent Parser
Decision gist · record as of 2026-08-14
Yes, if you use ua-parser for user-agent parsing. This package is a pure performance optimization with no API surface and no maintenance burden—install it alongside ua-parser to cut initialization overhead. No security issues, permissive license, and active monthly updates make it a straightforward win for any ua-parser user.AI-flagged interpretation of the facts on this page — verify before relying
Before you install
- Requires Python 3.10 or later; intended to be used as a dependency of ua-parser.
- Low friction installation with no runtime dependencies.
- Active maintenance on a 74-day release cycle, last commit 2026-05-27, and 648 repository stars indicate steady upkeep.
License · maintenance · safety
Apache 2.0 (permissive) — Apache 2.0 permissive license allows commercial and private use with minimal restrictions.
last release 2026-06-01 (74 days) · last repo commit 2026-05-27 · 648 stars
0 known vulnerabilities (OSV.dev, 2026-08-14) · 24,739,258 downloads/mo, #913 on PyPI
Alternatives
Verify before relying
pip install ua-parser-builtins
# The precompiled ruleset is used by ua-parser when both packages are installed together.- How ua-parser discovers and uses this package when both are installed.
- Magnitude of initialization time improvement compared to runtime rule compilation.
- Whether explicit configuration is required to activate the precompiled ruleset.
What it is and what it does
ua-parser-builtins is a data package, not a library—it contains no executable code or API of its own. Instead, it bundles the uap-core user-agent parsing ruleset precompiled into a wheel format. Its sole purpose is to serve as a dependency for ua-parser, the actual parsing library, reducing the time ua-parser takes to initialize by eliminating the need to compile rules at runtime.
The package is released monthly, automatically tracking updates from uap-core's default branch. Each release records the exact uap-core commit used in a REVISION file, ensuring reproducibility. It supports Python 3.10 through 3.14 across CPython, PyPy, and GraalPy implementations, and carries no runtime dependencies of its own.
Use it for
- Speed up ua-parser initialization in web applications that parse user-agent strings on every request.
- Ensure consistent user-agent rule versions across deployments by pinning a specific monthly release.
- Reduce startup latency in serverless or containerized environments where initialization time is critical.
- Keep user-agent detection rules current without manual updates by relying on monthly rule refreshes.
Worth the install?
AI-flagged interpretation of the facts on this page. Verify before relying on it.
Yes, if you use ua-parser for user-agent parsing.
This package is a pure performance optimization with no API surface and no maintenance burden—install it alongside ua-parser to cut initialization overhead. No security issues, permissive license, and active monthly updates make it a straightforward win for any ua-parser user.
Install
ua-parser-builtins on PyPI
Before you install
Low friction installation with no runtime dependencies. Active maintenance on a 74-day release cycle, last commit 2026-05-27, and 648 repository stars indicate steady upkeep.
Requires Python 3.10 or later; intended to be used as a dependency of ua-parser.
License in practice
Apache 2.0 permissive license allows commercial and private use with minimal restrictions.
Quickstart
pip install ua-parser-builtins
# The precompiled ruleset is used by ua-parser when both packages are installed together.Verify before relying
- How ua-parser discovers and uses this package when both are installed.
- Magnitude of initialization time improvement compared to runtime rule compilation.
- Whether explicit configuration is required to activate the precompiled ruleset.
Package facts
| License | Apache 2.0 permissive |
| Python support | Supports the current Python release >=3.10 |
| Install friction | Low. Pure-Python wheel |
| Runtime dependencies | None |
| Maintenance | Actively maintained 74 days since the last release |
| Last repo commit | |
| First released | |
| Downloads | 24,739,258 / month, #913 on PyPI 30-day window, as of 2026-08-14 |
| Known vulnerabilities | None known OSV.dev, checked 2026-08-14 |
| Classifiers | Development Status :: 4 - BetaEnvironment :: Web EnvironmentIntended Audience :: DevelopersLicense :: OSI Approved :: Apache Software LicenseOperating System :: OS IndependentProgramming Language :: PythonProgramming Language :: Python :: 3Programming Language :: Python :: 3.10Programming Language :: Python :: 3.11Programming Language :: Python :: 3.12Programming Language :: Python :: 3.13Programming Language :: Python :: 3.14Programming Language :: Python :: Implementation :: CPythonProgramming Language :: Python :: Implementation :: GraalPyProgramming Language :: Python :: Implementation :: PyPyTopic :: Internet :: WWW/HTTPTopic :: Software Development :: Libraries :: Python Modules |
Evidence: ua_parser_builtins-202606-py3-none-any.whl
Tags
Let your AI agent find packages like this
Example. Real query, live index.
You found this page by searching. An agent finds it by wishing: SkillFed indexes 14,416 PyPI packages by what they can do, searchable in plain language.
wish › “user agent parsing rules”
- ua-parser-builtinsProvides precompiled user-agent parsing rules for ua-parser to reduce…
- robotspyParses robots.txt files according to RFC 9309 and determines whether…
- ProtegoProtego parses robots.txt files and determines whether a given URL…
Give your agent the search over MCP, or paste the wish link into any chat.
More Python Modules packages
Converts domain names between Unicode and ASCII-compatible encoding (Punycode) according to IDNA 2008 and Unicode Technical Standard 46, with security validation and broader script coverage than the standard library.
Install it if you work with internationalized domain names, need to validate domains, or use HTTP clients that depend on it transitively.
Setuptools is a Python build backend and package management tool that handles building, distributing, and installing Python packages, including support for C/C++ extension modules.
PyYAML parses and emits YAML 1.1 data format, enabling serialization and deserialization of configuration files and Python objects to and from human-readable YAML text.
Pydantic validates Python data structures against type hints, coercing and checking input at runtime to ensure it matches a declared schema.
Provides reusable metadata objects for use with PEP-593 `typing.Annotated` to express common constraints like bounds, collection sizes, and predicates on types.
Install it if you use or build libraries that need to express type constraints in a standardized, inspectable way—or if you want to annotate your own types with…
Provides runtime tools to inspect and introspect Python type annotations, enabling programmatic examination of type hints at execution time.
See also ua-parser-rs · ua-parser · user-agents · ua-generator · fake-useragent · httpagentparser · django-user-agents · user-agent · tree-sitter-language-pack · woothee