Contact NetSymptom
Have a question about your internet problem, feedback on the diagnostic tool, or a bug to report? We read every message and typically respond within 48 hours.
About NetSymptom
NetSymptom is a free network diagnostic tool built to solve one specific problem: explaining why your internet feels slow even when your speed test looks fine. The tool analyses your symptoms and connection metrics using a weighted diagnostic engine to identify the most probable root cause — bufferbloat, ISP congestion, DNS latency, Wi-Fi packet loss, or server-side issues.
All analysis happens entirely in your browser. No data is sent to any server. No account or signup is required.
NetSymptom is operated independently and is supported by affiliate recommendations and advertising. Affiliate links are clearly labeled and never influence diagnostic results.
Quick Answers
Why does my speed test look good but internet feels slow?
Speed tests measure peak throughput to a nearby server. Real-world slowness is usually caused by bufferbloat, ISP peering congestion, DNS latency, or Wi-Fi packet loss — none of which speed tests measure. Use NetSymptom's free diagnostic to find the exact cause.
Is NetSymptom free?
Yes. The diagnostic tool is completely free, requires no signup, and runs entirely in your browser. It always will be.
Does NetSymptom collect my data?
No. All analysis is performed locally in your browser using JavaScript. No speed measurements, symptom selections, or results are ever sent to any server. See our Privacy Policy on the main page for full details.