cti-python-stix2 vs Filigran OpenCTI: Side-by-Side Comparison (2026)
Features, pricing, ratings, and pros & cons — compared head-to-head.
cti-python-stix2 is a free threat intelligence platforms tool. Filigran OpenCTI is a commercial threat intelligence platforms tool by Filigran. Compare features, ratings, integrations, and community reviews side by side to find the best threat intelligence platforms fit for your security stack.
CST VerdictBased on our analysis of NIST CSF 2.0 coverage, core features, company size fit, deployment model, here is our conclusion:
Threat intelligence teams who need to ingest, transform, and share STIX2 data across internal tools should use cti-python-stix2 to avoid vendor lock-in and reduce integration friction. The library handles JSON serialization natively with 398 GitHub stars and zero licensing costs, making it the fastest path to STIX2 compliance for teams already Python-native. Skip this if your analysts expect a UI or expect the tool to do threat hunting; it's a developer dependency, not an analyst platform.
Mid-market and enterprise security teams drowning in disconnected threat feeds will get the most from Filigran OpenCTI because its hypergraph architecture actually makes intelligence actionable instead of just stored. The 300+ integrations and STIX 2.1 data model mean you can ingest everything from your vendor ecosystem and surface signals that stay buried in spreadsheets elsewhere, with case management that ties intelligence directly to incident response. Skip this if you need a fully managed, point-and-click platform; OpenCTI demands some operational maturity to deploy and configure properly, and the open-source licensing model appeals to teams comfortable with self-hosted infrastructure.
