IPQualityScore (IPQS) has been the go-to fraud detection API for years. But in 2026, the threat landscape has changed dramatically — and IPQS hasn't kept up.
The Key Differences
Both Sentinel and IPQS offer IP reputation scoring, VPN detection, and proxy detection. But that's where the similarities end.
| Feature | Sentinel | IPQS |
| Antidetect browser detection | Yes | No |
| Device intelligence | Full (incognito, VM, emulator, bot) | No |
| Response time | < 40ms | 150-400ms |
| Free tier | 1,000/hr (no caps) | 5,000/mo |
| Residential proxy detection | Yes | Partial |
| 3D Face liveness | Yes | No |
| Setup time | < 5 minutes | ~1 hour |
Where IPQS Falls Short
No device-level detection. IPQS operates entirely at the IP layer. It checks the IP address against known VPN/proxy databases. If a fraudster uses a residential proxy with a clean IP, IPQS scores it as safe. It has zero visibility into whether the browser is spoofed, headless, or an antidetect tool.
Slower response times. IPQS averages 150-400ms per request. For checkout flows and real-time decisions, that's noticeable latency. Sentinel responds in under 40ms.
Limited free tier. IPQS offers 5,000 free requests per month. Sentinel offers 1,000 per hour — that's 720,000 per month, 144x more.
Where IPQS Is Better
Email validation. IPQS has a mature email validation API that checks for disposable emails, catch-all domains, and inbox existence. Sentinel focuses on connection and device analysis rather than email validation.
Phone validation. IPQS offers phone number risk scoring, which Sentinel doesn't.
When to Choose Sentinel
Choose Sentinel if you need to detect antidetect browsers, AI bots, or device spoofing. Choose Sentinel if response time matters (checkout, login). Choose Sentinel if you want a generous free tier for development and testing.
When to Choose IPQS
Choose IPQS if you primarily need email or phone validation alongside basic IP checks. Choose IPQS if antidetect browser detection isn't a concern for your use case.
Try Both
Both have free tiers. Sign up for Sentinel and IPQS, run the same traffic through both, and compare what each catches. The results speak for themselves.