Signal

by Ashutosh Patole

Network DiagnosticsLive on Play

Your WiFi is slow. Now you can prove why.

Signal scans every nearby access point, scores your network out of 100, and names the exact channel to switch to. No ads, no tracking, no account, all offline.

No ads. No tracking. No account.
Everything runs offline on your phone
Free on Google Play

Get it onGoogle Play

Android 8.1+

Signal home screen showing a connected network at -42 dBm on channel 8, a health score of 60 out of 100 and an S gaming grade — Home gives you the verdict first: connected network, RSSI, health score, gaming grade.

Capabilities

Everything it measures

Built for people who want an answer, not a dashboard. Every number below is computed on-device.

2.4 / 5 / 6 GHz

Hardware scan engine

Probes 2.4 GHz, 5 GHz and 6 GHz (WiFi 6E/7) networks with real-time RSSI signal strength, grouped by BSSID rather than merged by name.

20-160 MHz aware

Interference canvas

Visualises real bandwidth overlap across 20, 40, 80 and 160 MHz channels, so you can see exactly which neighbouring networks overlap yours.

Least congested wins

Cleanest-channel recommendation

Calculates the least congested channel in your immediate airspace and tells you which one to move to.

120+ manufacturers

Offline vendor lookup

Identifies over 120 router and phone manufacturers straight from the MAC address using a bundled OUI table. No internet connection required.

Up + down in parallel

Multi-stream speed test

Measures true download and upload bandwidth with parallel streams, alongside your negotiated transmit and receive link rates.

Valorant, BGMI, CODM, Fortnite

Gaming server ping

Measures latency, jitter and packet loss against Valorant, BGMI, CODM, Fortnite, Cloudflare and Google DNS, plus any custom server you add.

Latency under load

Bufferbloat detection

Runs a latency test under sustained load to reveal routers whose buffer memory is adding lag while you download.

WPA3 / evil twin

Security audit and rogue APs

Flags open, WEP and WPA-TIP as critical, marks WPA3-SAE and OWE as secure, and uses evil-twin heuristics to catch access points impersonating your network.

mDNS + UPnP

LAN device scanner

Discovers the phones, PCs and smart devices on your subnet via mDNS and UPnP, and tests gateway responsiveness and DNS resolver latency.

Screens

The whole answer on one screen

Signal home screen in its offline state with limited scanning mode and both scores unavailable — Decline location permission and Signal degrades honestly instead of showing invented data.

Signal onboarding screen reading See your Wi-Fi clearly with the app icon — Three onboarding screens, skippable at any point.

Signal permission screen explaining that location is required to scan WiFi and that scans stay on device — The permission rationale comes before the system dialog.

Signal final onboarding screen inviting the user to run their first scan — It ends on the action, not a wall of text.

Process

Three taps to an answer

01
Grant location, once
Android requires location permission to return WiFi scan results. Signal never records or uploads your coordinates.
02
Run a scan
Signal sweeps every access point in range and reads signal strength, channel, width, security and vendor.
03
Act on the tips
Get a ranked list of the changes that will actually help — channel migration, band steering, narrowing 2.4 GHz, isolating IoT devices.

Use cases

Who reaches for it

Competitive gamers

Ping spikes at peak hours and you don't know whether it's the game or the WiFi.

An S/A/B/C gaming grade from ping, jitter and packet loss, plus bufferbloat detection.

Flat sharers

Your neighbours' access points overlap your channel and everyone gets slower.

A cleanest-channel recommendation for your immediate airspace.

Anyone on public WiFi

You join a café network and want to know if it's actually encrypted.

A protocol audit that flags open, WEP and WPA-TIP, and hunts evil twins.

Router buyers

A new router advertises 1200 Mbps but your phone negotiates 144.

Real negotiated Tx/Rx link rates instead of the number on the box.

Details

Specifications

Platform: Android 8.1 and above
Price: Free, no ads
Account required: No
Works offline: Yes, except speed test
Built with: Kotlin, Jetpack Compose, Material 3 Expressive
Data collected: None

Privacy

Signal collects nothing and shares nothing. No tracking SDKs, no analytics, no Firebase, no advertising identifiers. Every analysis, chart, vendor lookup and security audit runs locally on your device. The only internet access happens when you explicitly start a speed test.

Questions

FAQ

Does Signal need my location permission?

Android requires location permission to return WiFi scan results. Signal never records or uploads your coordinates, and you can decline — the rest of the app still works in a reduced mode.

Is Signal a WiFi password cracking tool?

No. Signal is a network diagnostic tool. It reads channels, signal strength and security protocols, but it cannot recover passwords and has no phishing functionality.

Why does my speed test need internet access?

Only the speed test touches the network. Scanning, channel maths, vendor lookup, scoring and the security audit are all computed locally on your device.

How is the health score weighted?

Signal strength carries 40%, channel congestion 25%, link speed and latency 20%, and security 15%. The weighting is published in the app so you can disagree with it.

Signal