NetToolkit Pro vs MeterWorks Spectrum Analyzer

NetToolkit Pro is a professional network toolbox for engineers and power users. Run multi-target Ping with real-time charts, detailed stats (min/avg/max, loss), and one-tap export for sharing or reports. Discover open services with a fast port scanner. Monitor host availability with ICMP/TCP/HTTP/HTTPS checks at custom intervals. Review Wi-Fi roaming as a clear timeline with dwell durations to track AP switching. Connect and troubleshoot devices using an SSH client with interactive terminal access for quick remote checks and maintenance. Explore nearby BLE devices with a Bluetooth scanner, view advertised services, and inspect GATT characteristics (read/notify/write) for debugging buttons, sensors, and peripherals. All data stays on-device for privacy. FEATURES • Multi-target Ping with visual line charts • Detailed stats and one-tap export for reporting • Fast smart port scanner • Scheduled uptime monitoring (ICMP / TCP / HTTP / HTTPS) • Wi-Fi roaming history with dwell analysis • SSH client with interactive terminal access • Bluetooth (BLE) scanner + GATT explorer (services/characteristics) • Clean, responsive UI with instant feedback • On-device data storage for privacy SUBSCRIPTION INFO • Title: Monthly Subscription — auto-renewable (1 month) • Title: Yearly Subscription — auto-renewable (1 year) • A one-time “Lifetime Unlock” is also available. • Payment is charged to your Apple ID at confirmation of purchase. • Subscriptions renew automatically unless canceled at least 24 hours before the end of the current period. • Your account will be charged for renewal within 24 hours prior to the end of the current period. • You can manage or cancel your subscription at any time in your Apple ID settings. • Pricing varies by region. See in-app for current prices. Privacy Policy: https://privacy.dinghaishengshi.com/ Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

A tone you can't place — the motion-sensor deterrent next door, a beep from inside a wall, a hum from the basement. You can barely hear it, but it's there. MeterWorks Spectrum Analyzer makes it visible: live spectrum, automatic logging, an evidence PDF — on your device, no account, no subscription. MEASURE & CIRCLE IN • Live spectrum, linear or logarithmic axis, stepless pinch-zoom in frequency AND level • Peak detection with the resolution stated openly, 60-second waterfall • Device self-test "What can YOUR iPhone do?" shows the real usable top frequency before you buy • Walk mode: keep measuring while you walk the property, every point on the map carries its level — you circle in on a source, you don't locate it WATCH BANDS & LOG — THE EVIDENCE CHAIN • Pro: name your own watch bands ("cat-deterrent window" 16–24 kHz, "hum" 20–200 Hz, fully custom), each with its own threshold • Pro: automatic events — when a band crosses its threshold, the entry writes itself: start, duration, classification • Pro: walk report as PDF with a map snippet, a point table, and band spectra — plus CSV • Quiet references: save silence at a location, later measurements show the rise over it (1 free, more with Pro) DOCUMENT • PNG export with footer — free • Pro: multi-page PDF report with statistics, spectrogram, and event table • Pro: CSV export of the band levels — spreadsheet-ready FREE VS. PRO — NO SURPRISES Free: live spectrum with full zoom (3 sessions of up to 30 seconds each), waterfall, self-test, limits page, A/B comparison, 1 reference, three recordings of 10 seconds each, one walk of up to 30 seconds, PNG export. Pro is a single one-time purchase (no subscription, ever): watch bands, unlimited walks with report PDF and CSV, more references, unlimited live view and recordings, log PDF, CSV — all future Pro features included. WHAT THIS APP CANNOT DO — HONESTLY What kids can hear, this app can see: the audible range up to 24 kHz sits fully inside the iPhone microphone's window. True ultrasound above that is beyond any iPhone — and beyond any app that claims otherwise (the Nyquist limit of 48 kHz sampling). What holds up is the comparison within the same band over time, not an absolute dB value. This app documents, it doesn't judge: no "court-proof" claims — a clean log with openly stated limits. TYPICAL USES Circle in on a noise source in the garden or neighborhood · identify a sound you can barely hear yourself · confirm a motion-sensor or cat-deterrent frequency · document a hum inside the house NO SUBSCRIPTION. NO ADS. NO TRACKERS. All measurement data stays on your device — only band-aggregated spectra, never audio. MeterWorks is a family of honest measurement apps: Vibrometer, Sound Meter, Teslameter — Spectrum Analyzer is the fourth.