Constella Threat Intelligence Data Signals API is a commercial threat intel feeds solution by Constella Intelligence. SSLBL - SSL Blacklist is a free threat intel feeds solution. Features, integrations, deployment and the company behind each one, side by side.
API providing access to compromised identity data and threat signals
A project that detects malicious SSL connections by identifying and blacklisting SSL certificates used by botnet C&C servers and identifying JA3 fingerprints to detect and block malware botnet C&C communication.
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Based on what each listing shows: deployment, company size, price and open source.
SSLBL - SSL Blacklist fits if you are a startup or a small business and you need a free product.
Common questions when comparing Constella Threat Intelligence Data Signals API vs SSLBL - SSL Blacklist for threat intel feeds.
Constella Threat Intelligence Data Signals API: API providing access to compromised identity data and threat signals, built by Constella Intelligence.
SSLBL - SSL Blacklist: A project that detects malicious SSL connections by identifying and blacklisting SSL certificates used by botnet C&C servers and identifying JA3 fingerprints to detect and block malware botnet C&C communication.
The table above shows where their features, integrations, deployment and company size fit differ.
Often, yes. Constella Threat Intelligence Data Signals API and SSLBL - SSL Blacklist are both Threat Intel Feeds products. Key differences: Constella Threat Intelligence Data Signals API is Commercial while SSLBL - SSL Blacklist is Free. Use the table above to see where features, deployment and company size fit differ.
No Threat Intel Feeds shortlist yet. This is the closest one.
Updated 2026-11-01
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