ua-parser
Python port of Browserscope's user agent parser
Decision gist · record as of 2026-08-14
Yes. The package is actively maintained, has no known vulnerabilities, installs with low friction, and solves a common web development problem with a straightforward API. The Apache-2.0 license is permissive. Install with the [regex] extra unless memory is severely constrained.AI-flagged interpretation of the facts on this page — verify before relying
Before you install
- Requires Python 3.10 or newer; the [regex] extra is strongly recommended for performance.
- Low friction installation with a single runtime dependency.
- Actively maintained as of 2026-05-27, with recent releases and a stable codebase.
License · maintenance · safety
Apache-2.0 (permissive) — Licensed under Apache-2.0 (permissive), allowing use in commercial and proprietary projects with minimal restrictions.
last release 2026-04-05 (131 days) · last repo commit 2026-05-27 · 648 stars
0 known vulnerabilities (OSV.dev, 2026-08-14) · 27,440,250 downloads/mo, #860 on PyPI
Alternatives
Verify before relying
pip install 'ua-parser[regex]'
from ua_parser import parse
ua_string = 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_9_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2272.104 Safari/537.36'
result = parse(ua_string)
print(result.user_agent.family, result.os.family, result.device.family)- Performance characteristics of the regex feature variant versus pure Python implementation on different runtimes
- Accuracy and coverage of the underlying user-agent pattern database
What it is and what it does
ua-parser is the official Python implementation of the User Agent String Parser project. It takes raw user-agent header strings and breaks them down into structured components: browser family and version, operating system and version, and device type and brand. The package exposes a main parse() function that returns all three categories at once, plus separate functions to extract just browser, OS, or device data.
The library supports CPython 3.10 and newer, recent PyPy supporting 3.10, and GraalPy 25. It depends on ua-parser-builtins for its pattern data and offers two parsing backends: a regex-based resolver (recommended for speed) and a pure Python fallback (more memory-efficient but slower, especially on non-CPython runtimes). When a user-agent string cannot be parsed, the library returns None for the unmatched fields rather than raising an error.
Use it for
- Log analysis: identify which browsers and devices are accessing your web application
- Analytics: segment traffic by browser family, OS version, or device type for reporting
- Content negotiation: serve different content or features based on detected browser capabilities
- Bot detection: distinguish between real user agents and automated crawlers
- A/B testing: target experiments to specific browser or OS combinations
Worth the install?
AI-flagged interpretation of the facts on this page. Verify before relying on it.
Yes.
The package is actively maintained, has no known vulnerabilities, installs with low friction, and solves a common web development problem with a straightforward API. The Apache-2.0 license is permissive. Install with the [regex] extra unless memory is severely constrained.
Install
ua-parser on PyPI
Before you install
Low friction installation with a single runtime dependency. Actively maintained as of 2026-05-27, with recent releases and a stable codebase.
Requires Python 3.10 or newer; the [regex] extra is strongly recommended for performance.
License in practice
Licensed under Apache-2.0 (permissive), allowing use in commercial and proprietary projects with minimal restrictions.
Quickstart
pip install 'ua-parser[regex]'
from ua_parser import parse
ua_string = 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_9_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2272.104 Safari/537.36'
result = parse(ua_string)
print(result.user_agent.family, result.os.family, result.device.family)Verify before relying
- Performance characteristics of the regex feature variant versus pure Python implementation on different runtimes
- Accuracy and coverage of the underlying user-agent pattern database
Package facts
| License | Apache-2.0 permissive |
| Python support | Supports the current Python release >=3.10 |
| Install friction | Low. Pure-Python wheel |
| Runtime dependencies | 1 packageua-parser-builtins |
| Maintenance | Actively maintained 131 days since the last release |
| Last repo commit | |
| First released | |
| Downloads | 27,440,250 / month, #860 on PyPI 30-day window, as of 2026-08-14 |
| Known vulnerabilities | None known OSV.dev, checked 2026-08-14 |
| Classifiers | Development Status :: 5 - Production/StableEnvironment :: Web EnvironmentIntended Audience :: DevelopersOperating System :: OS IndependentProgramming Language :: PythonProgramming 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-1.0.2-py3-none-any.whl
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See also httpagentparser · ua-parser-rs · user-agents · device-detector · ua-generator · ua-parser-builtins · latest-user-agents · crawlerdetect · fake-headers · robotspy