IPGuardian API vs VPNDetection API

Two free Security APIs compared on access, reliability and developer ratings, using data from our daily health checks.

The verdict

Choose IPGuardian API if its data fits your use case better; on access and reliability it's level with VPNDetection API.
Choose VPNDetection API if its data fits your use case better; on access and reliability it's level with IPGuardian API.

	IPGuardian API	VPNDetection API
What it does	Check IP addresses against 140+ public threat intelligence blocklists.	Check whether an IPv4 or IPv6 address belongs to VPN infrastructure, no key needed.
Provider	IPGuardian	VPNDetection
API key	Not needed	Not needed
HTTPS	Yes	Yes
CORS (browser calls)	Yes	Yes
Status today	Online · 940 ms	Online · 726 ms
Uptime (30 days)	Up	Up
Developer rating	Not rated yet	Not rated yet
Price	Free / free tier	Free / free tier

Check IP addresses against 140+ public threat intelligence blocklists.

Check any IP against 140+ threat feeds. No signup, no API key, up to 100 addresses per request.

Strengths

Check whether an IPv4 or IPv6 address belongs to VPN infrastructure, no key needed.

The VPNDetection HTTP API tells you what we know about an IP address: one request, one address, and whether it belongs to VPN infrastructure.

Strengths

Prototyping or a tutorial? Pick the one that needs no API key (both qualify).
Calling from a web page? You need CORS. Otherwise route requests through your own server or a serverless function.
Going to production? Favour HTTPS, a strong uptime record and a provider with clear rate limits and terms. Check each API's docs before you commit.
Still unsure? Both are free to try: send one request to each and compare the data you get back.

Neither needs an API key; you can call both straight away.