Userstack

userstack.com

A REST API that parses User-Agent strings to detect the browser, device, and operating system in real-time.

The Userstack API uses api key authentication; has freemium pricing; offers a free tier (Free plan: 100 lookups/mo (FAQ elsewhere states 10,000 monthly lookups)). Verified 2026-07-12 with per-field source links.

Developer Tools Verified 2026-07-12 medium confidence

Base URL

https://api.userstack.com/

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Auth

api_key

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Free tier

Free plan: 100 lookups/mo (FAQ elsewhere states 10,000 monthly lookups)

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Pricing model

freemium

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Pricing

Free $0 (100 lookups/mo); Basic $9.99/mo (50,000 lookups, +$0.0007992 each); Business $49.99/mo (500,000); Business Pro $99.99/mo (2,000,000); Enterprise custom. ~15% off yearly.

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Rate limits

not documented null

no source

OpenAPI spec

not documented null

no source

MCP server

not documented null

no source