crt.sh vs Smallstep Device Identity Platform: Side-by-Side Comparison (2026)

crt.sh: Bash script for subdomain enumeration via crt.sh certificate transparency logs. Core capabilities include Subdomain enumeration via certificate transparency logs, Automated querying of crt.sh website, Parsing and filtering of crt.sh output..

Smallstep Device Identity Platform: Hardware-backed device identity platform for Zero Trust endpoint access control. built by Smallstep. Core capabilities include Hardware-backed device credential issuance, ACME Device Attestation (ACME DA) support, replacing SCEP, Automatic credential revocation on failed posture checks or device removal..

Both serve the External Attack Surface Management market but differ in approach, feature depth, and target audience.

crt.sh differentiates with Subdomain enumeration via certificate transparency logs, Automated querying of crt.sh website, Parsing and filtering of crt.sh output. Smallstep Device Identity Platform differentiates with Hardware-backed device credential issuance, ACME Device Attestation (ACME DA) support, replacing SCEP, Automatic credential revocation on failed posture checks or device removal.

crt.sh integrates with crt.sh. Smallstep Device Identity Platform integrates with Mobile Device Management (MDM) platforms, Identity Providers (IdP), Device posture platforms, F5, Saviynt and 2 more. Check integration compatibility with your existing security stack before deciding.

crt.sh and Smallstep Device Identity Platform serve similar External Attack Surface Management use cases. Key differences: crt.sh is Free while Smallstep Device Identity Platform is Commercial. Review the feature comparison above to determine which fits your requirements.