Signalyzr (pronounced 'signal-eye-zer') is a free, privacy-first network diagnostic tool made in India. It tells you exactly why your internet is slow — whether the cause is your Wi-Fi, your router, your phone, or your ISP — and gives you step-by-step fixes. Signalyzr is not the same as SignalR (a Microsoft ASP.NET framework) or signalyzer (a Python data-analysis package) — they are unrelated products with similar names.

Is Signalyzr the same as SignalR or signalyzer?

No, these are three different products with similar names. Signalyzr is a consumer network diagnostic tool at signalyzr.com, made in India for diagnosing slow internet, Wi-Fi issues, and call quality on Jio, Airtel, Vi, BSNL, and broadband. SignalR is Microsoft's ASP.NET real-time web framework for developers. signalyzer (with an extra 'e') is a Python package for time-discrete signal processing. If you are looking for an internet speed and quality diagnostic tool, you want Signalyzr — at signalyzr.com.

Why is my internet slow?

Common causes are ISP congestion at peak hours, high latency to your nearest server, packet loss on the line, router placement / Wi-Fi interference, and too many devices sharing the connection. Signalyzr identifies the specific cause for your connection in 30 seconds and shows you the fix.

Why is my Wi-Fi slow but internet is fast on other devices?

This pattern usually points to Wi-Fi-level issues: weak signal at your spot, congested 2.4 GHz channel, a saturated 5 GHz band, or a device-side driver problem. Run a Signalyzr diagnosis from the affected device — we measure both ends and tell you which side has the issue.

Why does my internet keep disconnecting?

Frequent disconnections are usually caused by Wi-Fi interference, a faulty router, an overheating modem, or instability on the ISP side. Signalyzr's diagnosis detects connectivity drops during the test and tells you whether the cause is local (your router/Wi-Fi) or upstream (your ISP).

How do I fix slow internet?

Step 1: run Signalyzr to identify the exact cause. Step 2: apply the specific fix we recommend — common ones include restarting the router, switching to a 5 GHz Wi-Fi band, changing your DNS to Cloudflare 1.1.1.1, or moving closer to your router. Generic 'restart your router' advice doesn't work when the actual problem is somewhere else.

Why is Jio slow today?

Jio congestion is common during evening peak hours (8–11 PM) in dense urban areas. Run Signalyzr to see whether the slowdown is on Jio's network specifically or on your handset's signal quality (tower distance, indoor coverage). If it's network congestion, switching from Wi-Fi calling or moving to a different band helps; if it's signal, the fix is different.

Why is Airtel slow today?

Airtel slowdowns are most common during 8–10 PM, in heavy-rain conditions, or after a tower outage in your area. Signalyzr measures your real download speed, latency and packet loss in 30 seconds and tells you whether the problem is Airtel's network or your specific connection to it.

BSNL fibre and broadband can be slow due to OLT congestion in your locality, last-mile copper damage, or DNS resolver issues. Signalyzr diagnoses which of these is the cause and gives you the specific complaint number / fix steps that match BSNL's actual problem.

Why is Vi (Vodafone Idea) slow?

Vi 4G has variable performance based on tower load and the band you're connected to. Signalyzr identifies whether you're stuck on a slow band, are too far from a tower, or are sharing congested capacity. Each cause has a different fix.

Why is YouTube buffering when my internet seems fine?

YouTube buffering despite a 'fast' speed test usually means high jitter, packet loss, or low sustained throughput — even when peak speed is OK. Signalyzr measures sustained speed and jitter, not just peak, so we catch buffering causes that basic speed tests miss.

Why is Netflix buffering?

Netflix needs around 5 Mbps sustained for HD and 25 Mbps for 4K — but it also needs low jitter and stable latency. Signalyzr measures all three and tells you whether your connection meets Netflix's actual requirements.

Why does my video call freeze on Zoom / Google Meet?

Video call freezes are almost always caused by jitter and packet loss, not raw speed. A 100 Mbps connection with 5% packet loss is worse for calls than a 5 Mbps connection with zero loss. Signalyzr measures packet loss + jitter under load — the actual call-quality numbers.

Why is my upload speed slow?

Slow upload affects video calls, cloud backups, screen sharing, and gaming. Common causes are ISP plan asymmetry (most Indian broadband plans give 10–30% the upload speed of download), Wi-Fi interference on uplink, or background sync apps. Signalyzr tests upload separately and tells you which it is.

Why is my mobile data slow?

Mobile data slowness is usually one of: low signal at your location, peak-hour tower congestion, daily FUP throttle after data limit, or being routed to a slow band. Signalyzr's mobile diagnosis tells you which — different problems need different fixes.

What is packet loss and how does it affect my internet?

Packet loss is when network packets sent from one end never reach the other. Even 1–2% loss causes video calls to freeze and games to lag. Signalyzr measures real packet loss on your connection and tells you whether it's coming from Wi-Fi, your ISP, or upstream — each needs a different fix.

What is latency and is mine too high?

Latency (also called ping) is the round-trip time for a packet. Under 30 ms is excellent, 30–60 ms is good, 60–100 ms is OK for browsing but bad for gaming, 100+ ms causes noticeable lag. Signalyzr measures yours and tells you whether the fix is changing DNS, switching to ethernet, or contacting your ISP.

Is my ISP throttling my internet?

ISPs in India sometimes throttle specific services (streaming, P2P, certain ports) or apply daily FUP throttling after a data limit. Signalyzr tests with multiple methods to detect throttling patterns and tells you what's happening.

Why is my router slow even though my plan is fast?

A slow router on a fast plan is one of the most common patterns we see. Causes: old 2.4 GHz-only router (max ~50 Mbps effective), bad Wi-Fi placement, channel overlap with neighbours, or firmware bugs. Signalyzr distinguishes router-limited from ISP-limited slowness in 30 seconds.

How do I check if my internet is working properly?

Run Signalyzr at signalyzr.com — no app install, no signup, takes about 30 seconds. We measure speed, latency, jitter, packet loss, and your ISP's identification, then tell you whether your connection is performing normally for your plan or has a specific problem.

Why is my 5G slower than 4G?

5G can paradoxically be slower than 4G when signal is weak (5G falls back to 4G but with handover overhead), when you're on a low band that's congested, or when your phone is in standalone vs non-standalone mode. Signalyzr identifies the actual band you're on and benchmarks against the average for your area.

Is Signalyzr free? Does it need an account?

Yes, Signalyzr is completely free with no advertising. No account or login is required — you open signalyzr.com, tap diagnose, and get your result. The Android app and the web app both work the same way.

Voice Call Quality Analyzer

Why do your calls freeze? We measure MOS, jitter, packet loss — the real reasons.

VoIP calls (WhatsApp, Zoom, Teams, Google Meet, regular cellular VoLTE) need three things: low latency, low jitter, low packet loss. If any of these breaks, your call freezes, robot-voices, or drops. Speed doesn't matter — a 5 Mbps connection with clean numbers carries calls better than a 500 Mbps connection with 2% loss.

Signalyzr's call analyzer measures all three plus your signal quality and predicts a MOS (Mean Opinion Score) — the standard voice quality rating used in telecom. We then tell you whether your problem is Wi-Fi, your ISP, your carrier, or just signal strength.

What this measures

Latency under realistic conditions
Jitter — variance that breaks audio buffers
Packet loss — gaps in voice = dropped syllables
MOS prediction — 4.0+ is good, 3.6+ is OK, below is bad
On Android app: deeper call-quality observation using on-device radio signals

How it works

Run a short simulated VoIP probe measuring jitter, loss and latency under realistic load
Predict MOS using a model tuned for Indian networks
Compare against the threshold for the call type (voice, video, group call)
Identify the dominant cause (latency / jitter / loss) and the most likely fix

Why this matters

Most people complain to their ISP about 'bad calls' and get told to restart the router. Signalyzr gives you the actual numbers — 'jitter 45 ms, packet loss 2.3%' — which forces the ISP to take the complaint seriously and gives you the specific fix.

Top fixes

If on Wi-Fi: switch to mobile data, compare — Wi-Fi is the culprit half the time
If on mobile: switch to Wi-Fi calling (VoWiFi) when signal is weak
Low MOS with high jitter → Wi-Fi 5 GHz or move closer to router
Low MOS with packet loss → suspect ISP or modem; complain with the numbers
Low MOS with low signal → coverage problem; needs tower or repeater
For VoLTE-specific issues: try airplane-mode toggle to force tower reselection

FAQs

What is MOS?

Mean Opinion Score, 1–5 scale. 4.0+ is 'good' (a normal phone call). 3.6+ is 'fair'. Below 3.6 is 'poor' (noticeable problems). Below 3.0 is 'bad' (struggling to understand). MOS is the standard telecom metric for voice quality.

Why does WhatsApp say 'unstable connection'?

WhatsApp shows that warning when it detects jitter > 50 ms or packet loss > 2%, even briefly. Run Signalyzr's call analyzer to confirm and identify which (jitter or loss) and where the cause is.

Why do my calls freeze on Wi-Fi but not mobile data?

Wi-Fi has more jitter and loss than mobile data when signal is weak or there's interference. If calls work on mobile data and not Wi-Fi, the problem is Wi-Fi-side — channel, distance, or interference.

Does the call analyzer record my audio?

Never. Signalyzr does not request microphone permission, does not access audio data, and does not record calls. We measure the network around the call (signal, jitter, loss) — not the call itself.

Analyze call quality →

Signalyzr is a free, privacy-first network diagnostic tool made in India. Loading the diagnostic app…