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/