castle.io

# Castle

> Stop bots and account abuse at scale. A complete suite of SDKs and APIs to monitor users, block bots, and stop in-app fraud.

## Product

- [Rules](https://castle.io/product/rules): Run velocity-based rules in real-time. Castle's rules engine lets you create advanced velocity queries and to block requests in real-time, trigger workflows, and send alerts.
- [Device Intelligence](https://castle.io/product/devices): Resilient device fingerprinting. Castle's device fingerprinting is engineered to circumvent ad blockers and privacy plugins. Up to 99.5% accuracy while maintaining a collision rate as low as 0.001%.

## Use Cases

- [Fake Accounts](https://castle.io/use-cases/fake-accounts): Block fake accounts in minutes. Efficiently weed out fake accounts with a our five minute frontend and backend integration.
- [Account Takeovers](https://castle.io/use-cases/account-takeovers): Protect from account takeovers in minutes. Efficiently prevent account takeovers with a our five minute frontend and backend integration.
- [Multi-Accounting](https://castle.io/use-cases/multi-accounting): Prevent multi-accounting in minutes. Efficiently weed out multi-accounting with a our five minute frontend and backend integration.
- [Content Abuse](https://castle.io/use-cases/content-abuse): Mitigate content abuse in minutes. Efficiently weed out content abuse with a our five minute frontend and backend integration.
- [SMS Pumping](https://castle.io/use-cases/sms-pumping): Thwart SMS pumping in minutes. Efficiently weed out SMS pumping with a our five minute frontend and backend integration.
- [Account Sharing](https://castle.io/use-cases/account-sharing): Tackle account sharing in minutes. Efficiently weed out account sharing with a our five minute frontend and backend integration.
- [Transaction Abuse](https://castle.io/use-cases/transaction-abuse): Combat transaction abuse in minutes. Efficiently weed out transaction abuse with a our five minute frontend and backend integration.
- [API Abuse](https://castle.io/use-cases/api-abuse): Deal with API abuse in minutes. Efficiently weed out API abuse with a our five minute frontend and backend integration.

## Customers

- [GitBook](https://castle.io/customers/gitbook): A developer friendly platform for publishing and sharing knowledge for technical teams, enabling teams to create, collaborate on, and publish knowledge bases.
- [Housecall Pro](https://castle.io/customers/housecall-pro): An industry-leading software solution empowering home service professionals to run all aspects of their business, from scheduling to payments.
- [Rue La La](https://castle.io/customers/rue-la-la): A platform boasting over 16 million members seeking top brands across various categories.
- [Touch of Modern](https://castle.io/customers/touch-of-modern): A leading e-commerce platform with over 14 million users, dedicated to unique and modern products.

## Resources

- [Documentation](https://docs.castle.io/)
- [API Reference](https://reference.castle.io/)
- [Blog](https://blog.castle.io/)
- [Changelog](https://castle.io/changelog)
- [Status](https://status.castle.io/)

## Other

- [About](https://castle.io/about)
- [Pricing](https://castle.io/pricing)
- [Contact](https://castle.io/contact)
- [Brand Assets](https://castle.io/brand-assets)
- [Terms of Service](https://castle.io/terms)
- [Privacy Policy](https://castle.io/privacy)
- [Trust Center](https://castle.io/trust)