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About Userstack
What Does Userstack Do?
Userstack is a real-time User-Agent string parsing API that identifies browser, device, operating system, and crawler data from any user-agent string. It solves the problem of inaccurate device detection by providing instant, reliable JSON responses backed by a daily-updated proprietary database.
Who Is It For?
Userstack is built for developers, product teams, and marketing professionals who need to tailor content, detect crawlers, or optimize user experiences based on device and browser type. It is not designed for non-technical users who cannot integrate REST APIs.
Real Use Cases
Use Userstack for native app download prompts, tailored advertising, custom content delivery, spambot detection, and crawler protection. The API integrates in under 10 minutes using PHP, Python, Node.js, jQuery, Go, or Ruby.
Performance & Reliability
Backed by scalable cloud infrastructure, Userstack processes requests in milliseconds and supports from hundreds to millions of lookups per day. All data streams are secured with 256-bit SSL encryption.
Key features
- Real-Time Device Detection — Identify any browser, device, and OS from a User-Agent string in milliseconds.
- Crawler & Spambot Detection — Detect crawlers and spambots to protect your site and analytics.
- Daily Updated Database — Proprietary User-Agent mapping updated multiple times per week for high accuracy.
- JSON & XML API — Simple REST API responding in JSON or XML, compatible with any major language.
- Bank-Level Security — All data encrypted with 256-bit SSL encryption.
- Scalable Infrastructure — From 100 free lookups per month to millions per day with no performance loss.
- Extensive Documentation — Get started in minutes with clear API docs and code examples.
SaaSpartout Score
7.5
/10
Editorial score from our review methodology — not user ratings.
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Userstack Pricing
Userstack pricing: from $9.99/mo. Billing model: Subscription.
For comparison: the median starting price in Developer Tools is $19.99/month, measured across 301 tools we track. See the full SaaS Pricing Index →
Free
$0 per month — 100 lookups/month, Device/Browser/OS detection, HTTPS encryption. No support.
Basic
$9.99/month (or $8.99/month billed yearly) — 50,000 lookups/month + $0.0007992 per extra lookup. Device/Browser/OS/Crawler detection, HTTPS encryption, standard support.
Business (Most Popular)
$49.99/month (or $43.99/month billed yearly) — 500,000 lookups/month + $0.00039992 per extra lookup. Includes all Basic features plus bulk lookups, standard support.
Business Pro
$99.99/month (or $84.99/month billed yearly) — 2,000,000 lookups/month + $0.00019998 per extra lookup. Includes all Business features plus standard support.
Enterprise
Custom pricing — volume lookups, all features, custom solutions. Contact for a quote.
All plans include a free tier to start — no credit card required.
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Get the deal →Frequently asked questions
Is Userstack free?
Yes, Userstack offers a free forever plan with 100 lookups per month, including device, browser, and OS detection.
How much does Userstack cost?
Userstack pricing starts at $9.99 per month for 50,000 lookups. Business plans start at $49.99/month, and Business Pro at $99.99/month. Enterprise custom pricing is available.
How does Userstack work?
Userstack parses User-Agent strings via a simple JSON/XML REST API. You send a User-Agent string and receive instant data on browser, device, OS, and crawler status.
Who is Userstack for?
Userstack is for developers and product teams who need real-time device detection for tailored content, advertising, crawler protection, or analytics. It requires API integration skills.
What are Userstack alternatives?
Alternatives include WhatIsMyBrowser, 51Degrees, and DeviceAtlas. Userstack stands out with a free tier, simple API, and daily-updated database.
What is the main limitation of Userstack?
The free plan is limited to 100 lookups per month. For higher volumes, paid plans are required. Also, it is not a no-code tool.
