Smallstep is a Device Identity Platform™ designed to close a critical gap in Zero Trust security by authenticating devices, not just users. Using ACME Device Attestation, it creates hardware-bound credentials that prove a device’s authenticity and ownership with cryptographic certainty. These credentials protect access to corporate Wi-Fi, VPNs, SaaS tools, cloud workloads, source code, and sensitive data. Co-developed with Google and standardized at the IETF, ACME DA modernizes legacy approaches like SCEP with stronger guarantees and simpler automation. Smallstep works across macOS, Windows, Linux, iOS, and Android, making it ideal for heterogeneous environments. With deep integrations across enterprise IT and DevOps stacks, it delivers scalable, high-assurance device security without operational complexity.