Free User-Agent Parser
Paste a User-Agent string · from logs or analytics · and identify the browser, OS, device class, and whether it's a known bot or AI crawler.
Frequently asked
Can I trust a User-Agent header?
No · it's client-supplied and trivially spoofed. Fine for analytics and debugging, never for security decisions. SimplyScan flags apps that gate features or auth by User-Agent.
Which bots does it recognize?
Search crawlers (Googlebot, Bingbot), social preview fetchers, monitoring agents, and the AI crawlers that matter for AEO · GPTBot, ClaudeBot, PerplexityBot, Google-Extended, and friends.
Related tools
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- .env File Linter · Paste your .env and get instant findings · secrets that will ship to the browser, duplicate keys, quoting problems · plus a generated .env.example.
- JWT Debugger · Paste a JSON Web Token to decode its header and payload · and get flagged for alg:none, weak algorithms, missing expiry, and sensitive claims.