NetMaster: Network Tester

NetMaster is a privacy-conscious network diagnostic toolkit that helps you understand slowdowns, instability, and intermittent dropouts without an account, ads, analytics, or tracking. RUN A COMPLETE NETWORK SCAN • Measure download and upload goodput with parallel HTTPS requests • See HTTPS latency, jitter, request failures, and a second latency vantage point • See confidence ranges and a p95 only when enough observations support it • Check direct UDP DNS response delivery across two providers, including bursts • Check latency under load and receive a bufferbloat grade • Compare everyday and first-time DNS response times • See the DNS transport observed for NetMaster’s measured request and compare resolver performance • Test real IPv4 and IPv6 reachability • Time the router hop and see whether added delay is local or farther upstream • Review public IP, ASN, egress region, TLS, HTTP, Wi-Fi security, captive-portal evidence, and tunnel indicators NARROW DOWN CONNECTION PROBLEMS Quick Diagnosis checks the path, router, internet reachability, DNS, and responsiveness in sequence, then gives one likely explanation and a practical next step. INVESTIGATE INTERMITTENT DROPOUTS Run the monitor for 5, 15, or 30 minutes. On iOS 26, a user-started finite session can request system-supported lock-screen continuation; earlier iOS versions must keep NetMaster visible. NetMaster records route changes, roughly one-second HTTPS heartbeats, gateway and DNS controls, IPv4/IPv6 evidence, latency changes, unknown coverage gaps, and optional access-point roaming evidence. Mark the moment you notice a dropout to compare your experience with the measurements. UNDERSTAND WHAT WILL WORK Plain-language readiness assessments explain whether the measured connection should handle video calls, 4K streaming, gaming, browsing, and large uploads. Protected local history makes it easier to compare the same network over time, with an optional metrics-only mode. BUILT FOR HONEST RESULTS A throughput-payload budget controls speed-test data use. Replenished parallel transfers target a stable measurement window; if a fast link exhausts the cap too soon, NetMaster labels the result as a lower bound instead of claiming it is the link maximum. HTTPS request timing is not ICMP ping. HTTPS failures and UDP DNS response loss are each labeled narrowly and are not presented as raw packet loss. PRIVACY BY DESIGN History stays in protected on-device storage and can be switched to metrics-only at any time. Dropout sessions use one redacted, protected recovery checkpoint so a crash or system expiration does not erase evidence. Reports leave the device only when you choose Share, with sensitive-address redaction enabled by default. Important: Public iOS APIs do not expose exact Wi-Fi or cellular dBm, the connected Wi-Fi channel, channel width, or exact frequency band. NetMaster never invents those values. Wi-Fi identity is optional and requires system permission. A full scan transfers network test data; the Balanced default allows about 54.5 MB of throughput payload, plus small diagnostic requests and normal protocol overhead. Results are diagnostic evidence, not a guarantee or proof that a router, carrier, VPN, or service is defective.