Source we aggregate
isMalicious + GreyNoise
Internet noise classification and enrichment. isMalicious consumes this source and correlates it with others. Here is what that adds, and when to go direct.
GreyNoise is one of the sources isMalicious aggregates
We do not replace GreyNoise. Rows where isMalicious shows a capability GreyNoise lacks mostly come from the aggregation layer; for GreyNoise’s core use case, use GreyNoise directly.
Quick verdict
Choose isMalicious for API-first threat intelligence with multi-source correlation, CVE data, and ransomware tracking. Choose GreyNoise for alert triage and internet noise reduction in siem environments.
isMalicious
Threat intelligence API with multi-source correlation, CVE data and ransomware leak-site tracking.
Best for: Automated threat intelligence at scale
GreyNoise
GreyNoise classifies IPs seen in mass internet scanning as noise or targeted activity. Teams use it to filter benign scanner traffic out of their alerts.
Best for: Alert triage and internet noise reduction in SIEM environments
Feature comparison
| Feature | isMalicious | GreyNoise |
|---|---|---|
| IP reputation | ||
| Domain reputation | ||
| URL scanner | ||
| Internet scanner classification | Partial | |
| Multi-source threat correlation | ||
| Ransomware leak-site tracking | ||
| CVE intelligence (CVSS, EPSS, KEV) | Partial | |
| STIX/TAXII export | ||
| Bulk API | ||
| Streaming feed | ||
| NRD list | ||
| Free tier available |
Check this table against your own indicators.
Run a free reportGreyNoise: strengths and limitations
- Mass scanner classification
- Alert fatigue reduction
- Shodan-like enrichment
- SIEM integrations
- IP-only (no domain or URL reputation)
- Not a general-purpose threat feed
- No CVE-to-IOC correlation
- No ransomware tracking
- No dark web data
- Higher price point for full access
Pricing
isMalicious
Free: website lookups with no monthly cap and 250 API calls a month. Pro from €99/month. Enterprise custom pricing.
View pricing →GreyNoise
Free community tier, paid from ~$100/month
Frequently asked questions
Is isMalicious better than GreyNoise?
Can I use isMalicious alongside GreyNoise?
Does isMalicious reduce SIEM alert fatigue like GreyNoise?
Other comparisons
Decide with your own data
Don't take our word over GreyNoise's. Check something real.
Paste an IP, domain or URL: reputation, WHOIS, DNS, ransomware signals and an AI-generated assessment. Free, no signup.
- 250 free API calls/month
- No credit card required
- API key in under 2 minutes