WiFi Diag - Latency & Roaming
Packet Loss & Mesh Diagnostics
Free · Designed for iPad. Not verified for macOS.
Launch offer: free for a limited time. Diagnose latency, packet loss, dropouts and Wi‑Fi roaming with detailed history and export. No ads or subscriptions.
WiFi Diag helps you investigate lag, instability and access-point roaming on home Wi‑Fi, Mesh and enterprise AC+AP networks.
Rather than giving you a single speed-test number, WiFi Diag continuously measures TCP round-trip time through a WebSocket Echo Server and places latency, echo timeouts, real connection interruptions and Wi‑Fi roaming on one timeline.
KEY FEATURES
• High-frequency RTT diagnostics with current, average and P95 latency.
• Track echo loss, late responses, disconnections, reconnections and unavailable time.
• Detect AP roaming by recording BSSID changes on the same SSID when Wi‑Fi information access is available.
• Tap, drag, pan and zoom the interactive chart to inspect individual samples and longer time ranges.
• Save diagnostic history and review roaming and disconnection records.
• Export complete sessions as CSV or JSON.
• Choose a saved endpoint or add your own WebSocket Echo Server, including one deployed on your LAN.
• View useful network context such as local IP addresses, subnet, gateway, DNS, proxy and VPN status when iOS makes it available.
FOR HOME AND PROFESSIONAL NETWORKS
Use WiFi Diag to compare different rooms or times of day, investigate unstable calls and games, verify Mesh handoffs, or document AC+AP behavior during a walk test.
PRIVACY
WiFi Diag does not request or read your geographic coordinates. iOS requires Precise Location permission before apps can access the current SSID/BSSID. You can deny permission and still diagnose latency and connection stability, but Wi‑Fi names and roaming detection will be unavailable. Diagnostic history stays on your device unless you export it.
IMPORTANT
WiFi Diag measures TCP round-trip behavior; it is not a bandwidth speed test, RF scanner or signal-strength analyzer. Keep the app in the foreground during a diagnosis because iOS may pause background execution.
No ads. No subscriptions. No in-app purchases.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Bug fixes and performance improvements.
The developer, PinFong Inc., indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- PinFong Limited
- Size
- 6.1 MB
- Category
- Utilities
- Compatibility
Requires iOS 16.0 or later.
- iPhone
Requires iOS 16.0 or later. - iPad
Requires iPadOS 16.0 or later. - Mac
Requires macOS 13.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
English and 10 more
- English, Arabic, French, German, Japanese, Korean, Portuguese, Simplified Chinese, Spanish, Traditional Chinese, Vietnamese
- Age Rating
4+
- 4+
- Copyright
- © 2026 PinFong Inc.