Sentinel vs IPQS
IPQualityScore (IPQS) is one of the most widely-used IP reputation APIs, built around a large database of known bad IPs. It works well for blocking datacenter proxies and known VPN exit nodes — but modern fraud has moved on. In 2026, the majority of fraud originates from residential IPs and antidetect browsers that IPQS was never designed to catch.
Sentinel vs IPQualityScore (IPQS) — Side by Side
| Feature | Sentinel | IPQS |
|---|---|---|
| Response Latency | < 40ms | 150–400ms |
| Residential Proxy Detection | ✓ Full | Partial |
| Antidetect Browser Detection | ✓ Full | ✗ None |
| Agentic AI Bot Detection | ✓ Full | ✗ None |
| No CAPTCHA Required | ✓ Yes | ✗ No |
| Client-Side SDK Token | ✓ Yes | ✗ No |
| IoT / Hijacked Device Detection | ✓ Yes | ✗ No |
| Free Tier | ✓ 1,000 req/hr unlimited | ✓ 5,000 req/mo |
| Transparent Pricing | ✓ Yes | Partial |
| IP Reputation Database | ✓ Yes | ✓ Large database |
| Email Validation | — | ✓ Yes |
What is IPQualityScore (IPQS)?
IPQualityScore is a fraud prevention service offering IP reputation scoring, email validation, phone verification, and device fingerprinting. Founded in 2012, it has a large IP blacklist database and is popular for its low barrier to entry.
IPQS Strengths
- Large IP blacklist database
- Email & phone validation
- Low-cost entry plans
- Fast API response for basic lookups
- Established track record
IPQS Weaknesses
- Cannot detect residential proxy networks
- No antidetect browser detection (Kameleo, GoLogin, AdsPower)
- No agentic AI bot detection
- Response latency 150–400ms
- Requires CAPTCHAs for bot detection
- No client-side behavioral SDK
- Fingerprinting bypassed by modern antidetect tools
Pricing
Free tier: 5,000 requests/month. Paid plans from ~$100/month.
When to use IPQS, when to use Sentinel
Use IPQS if...
- Basic IP reputation checks where datacenter proxy blocking is sufficient.
Use Sentinel if...
- Your attackers use residential proxies or antidetect browsers
- You need detection in under 40ms without slowing down your product
- You want to start free with no credit card
- You need CAPTCHA-free bot detection
- If your fraud is using residential proxies, antidetect browsers, or AI-powered bots, IPQS will not catch it. These attack vectors are invisible to IP reputation databases.
Get started with Sentinel — free
1,000 API requests per hour. No credit card. No CAPTCHA. Detects what IPQS misses.
Frequently Asked Questions
Is Sentinel better than IPQS?
Sentinel detects residential proxies, antidetect browsers (Kameleo, GoLogin), and AI bots — capabilities IPQS does not have. IPQS is strong for IP reputation and email validation. If your threat model includes modern evasion techniques, Sentinel is the better choice.
What does IPQS miss that Sentinel catches?
IPQS misses residential proxy networks, antidetect browsers, agentic AI bots, and IoT device hijacking. These are the fastest-growing fraud vectors in 2026. IPQS was designed for an era when fraud came from known datacenter IPs — that era is over.
Is there a free alternative to IPQS?
Yes. Sentinel offers a free tier with 1,000 API requests per hour, no credit card required, and no expiry. IPQS free tier is limited to 5,000 requests per month and does not include device intelligence or antidetect browser detection.
Does Sentinel detect residential proxies?
Yes. Sentinel detects residential proxy networks including BrightData, Oxylabs, IPRoyal, and similar providers. This is done through device-layer analysis, not IP blocklists, so it catches proxies even when the IP address appears clean.