COMPARISON / OPEN SOURCE
OpenCTI vs MISP: which open-source threat-intel platform in 2026
The two dominant open-source CTI platforms solve different problems. Here is the honest split, the run-both pattern, and how to choose if you can only run one.
Last verified: June 2026 | Sources: OpenCTI docs (Filigran), MISP project
DIRECT ANSWER
OpenCTI and MISP are not substitutes; they occupy different layers of a CTI stack. MISP is a threat-intelligence sharing platform built around an event-and-attribute model for exchanging indicators of compromise (IoCs) with communities. OpenCTI is a STIX 2.1 knowledge-graph platform built for structuring threat actors, campaigns, and TTPs for internal analysis.
If you can only run one: pick MISP for community IoC sharing and feed aggregation, OpenCTI for building an analyst-facing knowledge graph. Most mature teams run both, with MISP feeding OpenCTI through OpenCTI's native MISP connector. Both are free and self-hosted; OpenCTI additionally has a commercial Enterprise Edition.
OpenCTI vs MISP at a glance
| Dimension | OpenCTI | MISP |
|---|---|---|
| Primary purpose | Knowledge graph of actors, campaigns, TTPs | IoC sharing and feed aggregation with communities |
| Data model | STIX 2.1 native (objects and relationships) | Event and attribute model, STIX/TAXII export |
| Interface | Modern analyst UI, GraphQL API, dashboards | Event-centric UI, REST API, correlation engine |
| License | Apache 2.0 (Community Edition) | AGPLv3 (GPL v3 + Affero clause) |
| Paid tier | Commercial Enterprise Edition (Filigran) | None from the project (third-party support only) |
| Maintainer | Filigran | CIRCL Luxembourg + community |
| Best for | Analyst-facing intelligence store, TTP modelling | Community sharing, ISAC/CERT participation, feed ingest |
Licensing verified against OpenCTI documentation (Filigran) and the MISP project licence page, June 2026.
Which one first?
Start with MISP if:
- The primary use case is sharing and consuming IoCs with a community
- The team participates in an ISAC, ISAO, or national CERT sharing group
- You need distribution controls and sharing-group scoping
- You want fast operational value from free STIX/TAXII feed aggregation
- A fully open stack with no commercial tier is a hard requirement (AGPLv3)
Start with OpenCTI if:
- You are building an internal knowledge graph of actors, campaigns, and TTPs
- STIX 2.1 relationship modelling is a requirement, not a nice-to-have
- The team needs a modern analyst-facing UI and a GraphQL API
- You want a large connector ecosystem to normalise many sources
- You may later want commercial support or Enterprise Edition automation
The intents rarely conflict. Teams that share IoCs heavily lead with MISP; teams doing deep actor and campaign analysis lead with OpenCTI. The decision is about which job is more urgent, not which product is superior.
The run-both pattern (most common in production)
The dominant real-world architecture runs both platforms with MISP feeding OpenCTI:
- ->MISP ingests free feeds (CIRCL OSINT, abuse.ch, CISA KEV, AlienVault OTX) and community-shared events. It handles distribution controls and sharing-group scoping.
- ->OpenCTI's native MISP connector imports those events and converts them to STIX 2.1 objects inside the knowledge graph.
- ->OpenCTI builds relationships (IoC to campaign to actor to TTP) and gives analysts a graph UI and GraphQL API to query them.
- ->Enrichment and case management (Cortex, TheHive) layer on top of either platform.
The full stack, hosting sizing, and LLM-orchestrator reference architecture are on the open-source CTI stack page. For the agent-driven triage layer that sits on top, see the agentic SOC buildout.
OpenCTI and MISP alternatives
The closest alternative to each is the other. Beyond the two, the platforms that overlap on function:
ThreatConnect
Commercial platform combining a threat-intel store with SOAR-style orchestration. The nearest commercial parallel to running OpenCTI plus a workflow engine.
Anomali
Commercial platform plus intelligence feeds; overlaps with the MISP feed-aggregation and OpenCTI analysis roles in a single product.
Recorded Future / Mandiant
Feed-and-research depth rather than a self-hosted platform. Often ingested into OpenCTI or MISP rather than replacing them.
DomainTools
A data source (domain and DNS intelligence), not a platform. Feeds into OpenCTI or MISP as an enrichment connector.
TheHive
Not an alternative but the standard open-source case-management companion to either platform.
Commercial comparisons: ThreatConnect, Anomali, DomainTools.
FAQ
Is OpenCTI better than MISP?
Neither is better in the abstract; they solve different problems. MISP is a threat-intelligence sharing platform built around an event-and-attribute model for exchanging indicators of compromise with communities (ISACs, CERTs, sector sharing groups). OpenCTI is a STIX 2.1 knowledge-graph platform built for structuring threat actors, campaigns, and TTPs for internal analysis. If you must pick one: choose MISP for community IoC sharing and feed aggregation, OpenCTI for building an analyst-facing knowledge graph. Most mature teams run both, with MISP feeding OpenCTI through OpenCTI's native MISP connector.
Can OpenCTI and MISP work together?
Yes, and this is the most common production pattern. OpenCTI ships a native MISP connector that imports MISP events and converts them into STIX 2.1 objects inside the OpenCTI knowledge graph. In this architecture MISP is the community-sharing and feed-ingestion layer, and OpenCTI is the analyst-facing knowledge graph and enriched intelligence store. The two are complementary rather than competing: MISP handles distribution controls and community sharing, OpenCTI handles relationship modelling and analysis.
Is OpenCTI free? What license is it under?
OpenCTI Community Edition is free and open-source under the Apache 2.0 license, self-hosted with no per-seat cost. Filigran (the company behind OpenCTI) also sells a commercial Enterprise Edition that adds AI-assisted import and report generation, automated playbooks, priority intelligence requirements (PIRs), FINTEL, and dedicated support. The current major release line is OpenCTI v7, which introduced a long-term-support (LTS) option for teams that prioritise stability.
Is MISP free? What license is it under?
MISP is fully free and open-source under the AGPLv3 license (GPL v3 plus the Affero clause, which requires making the source available to network users). Unlike OpenCTI, MISP has no commercial paid tier from the project itself; it is maintained by CIRCL (Computer Incident Response Center Luxembourg) and the community. Commercial support and hosting are available from third parties, but the software itself is entirely open.
What are the alternatives to OpenCTI and MISP?
The closest open-source alternative to each is the other: teams evaluating OpenCTI usually also evaluate MISP, and vice versa. Beyond OSS, commercial threat-intelligence platforms cover overlapping ground: ThreatConnect and Anomali (platform plus intelligence), Recorded Future and Mandiant (feed depth and research). DomainTools is a data source rather than a platform and is often ingested into OpenCTI or MISP rather than replacing them. For case management alongside either platform, TheHive is the standard open-source companion.