User Agent Parser
Quick answer
Paste any UA string and get a structured breakdown of browser, OS, and device hints where parseable.
For a related estimate, see Screen Resolution Checker.
Explore further: Browser Info Tool · Viewport Size Calculator
Parsing limits
User agents are not standardized contracts—vendors change formats. Parsers use heuristics; edge cases (embedded WebViews, bots, privacy browsers) may misclassify.
Explore further: Responsive Viewport Tester · Safe Area Checker
A user agent string is a compact header browsers send; parsing turns it into structured fields for debugging and analytics. Use it when you are decoding logs, testing crawlers, or comparing desktop vs mobile signatures.
How to use this calculator
- Open the tool: Paste a full user agent from your server logs or `navigator.userAgent`.
- Tune inputs: Run parse—fields fill from the project’s UA parsing rules.
- Read the output: Copy the normalized summary into tickets or spreadsheets.
Real-world examples
- Mobile Safari sample: Often includes device and WebKit build tokens—verify against real device labs for critical decisions.
- Bot UA: May look like a browser; combine with IP and behavior signals for bot management.
Explore further: Accessible Color Palette
Tips & gotchas
For “is this Chrome?” questions in production, pair UA hints with Client Hints if available—UA alone is increasingly unreliable.
FAQ
Is parsing 100% accurate?
No—treat it as a best-effort summary, especially for rare or spoofed agents.
Does this tool send my text to a server?
Calciverse runs in your browser; we do not store your inputs on our servers for these utilities. Anything that uses network APIs (for example DNS lookup) only sends what you explicitly request.
Why do results differ from another site?
Rounding, defaults, and implementation details (color spaces, tokenizers, DNS resolvers) can differ. Compare definitions, not just the headline number.