NetDiag+ Network Toolkit

Your video call froze. Your game just spiked to 300 ms. Your Wi-Fi says "Excellent" and the speed test looks fine. NetDiag+ tells you what's actually wrong — and where, in the chain from your phone to the server, the problem lives. 31 network tools on stock Android. No root, no account. FIND THE WEAK LINK • Health Score: one run of about 40 seconds gives a 0–100 score and a verdict for your Wi-Fi, router and ISP • Bufferbloat: lag under download and upload load, graded A+ to F, with download and upload speed • Latency Dashboard: latency, jitter and loss to the services people in your market use, worst first. Curated for Saudi Arabia and the Gulf, Turkey, Russia and Egypt; a global set elsewhere • Re-check at the other end of the day with one reminder, and compare evening and daytime averages in your recent checks • Home-screen widget with your last score • Report for your provider: all your checks in one text or PDF document — daytime and evening, who was at fault each time, and the numbers behind every score. MEASURE • Ping (real ICMP, no fake TCP fallback) • Path MTU (DF-bit binary search — find fragmentation) • Traceroute + MTR (per-hop loss and latency) • Speed Test (Cloudflare, with jitter — not just Mbps) • STUN / NAT type (spot symmetric NAT that breaks P2P) • Wi-Fi info (signal, channel, 2.4 GHz overlap warning) INSPECT • DNS lookup + Encrypted DNS (DoH; compares 3 resolvers) • Reverse DNS, WHOIS (with IANA referral) • TLS Inspector (full cert chain, expiry) • SSL Checker (probes TLS 1.0-1.3 separately) • HTTP/3 + QUIC reachability • HTTP headers + redirect chain SCAN • LAN Scanner (concurrent /24 sweep) • Port Scanner (19 common ports) • TCP Ping (when ICMP is filtered) • mDNS / Bonjour browse DIAGNOSE • Network Passport (one-tap composite report — shareable) • Site Reach (DNS → TCP → TLS → HTTP; names the failing layer) • VPN Check (should you use a VPN on this network? IP + NAT + DNS leak + geo — 4 probes, one answer) • Host Monitor (watch a service for outages) • Subnet Calculator (offline) • IP Info (geolocation, ISP, AS; flags mobile/proxy/hosting) • Network Info (transport, DNS, MTU) BUILT TO BE TRUSTED • No account, no sign-up • Tests run on your device, not on our servers • Usage statistics via Firebase Analytics, linked to a device ID, not to your name or email • Test history stays local • Open protocols only (ICMP, TCP, UDP, HTTPS, DoH) WHO IT'S FOR • Gamers chasing the lag spike that ruins ranked matches • Remote workers whose Zoom freezes while the speed test says fine • Anyone who wants to check that their ISP delivers what they pay for • Network engineers, SREs, home-lab tinkerers who want real numbers FREE AND PREMIUM • Every tool is free. An optional one-time Premium, not a subscription, adds 30- and 90-day Bufferbloat trends and every market in the Latency Dashboard. • Some results, mostly ones that find a problem, show an offer for a VPN service. That offer is the only advertising in the app. Support: netdiag.online/support/ Privacy: netdiag.online/privacy/