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.

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VoIP Call Quality Test

Check whether your connection is ready for WhatsApp, Zoom, Teams, Discord or SIP calls.

Signalyzr mobile app launching soon — advanced diagnostics for radio signal and deeper cellular insight.

A VoIP call quality test is different from a normal speed test. Calls need stable timing: low latency, low jitter, near-zero packet loss and enough sustained upload. Extra download Mbps rarely fixes choppy audio.

Signalyzr checks the network conditions that decide real call quality for WhatsApp, Zoom, Google Meet, Microsoft Teams, Discord, Skype and SIP softphones — without recording audio or asking for microphone access.

Use this before an important meeting, remote interview, customer-support shift or gaming voice session. If the score is weak, the fix is usually Wi-Fi band, packet loss, VPN, DNS/routing or ISP congestion — not simply buying a faster plan.

What this measures

Latency / ping — delay before the other side hears you
Jitter — packet timing variance that causes robotic voice
Packet loss — missing audio frames that create dropouts
Sustained upload — the bottleneck for voice + video calls
Predicted MOS-style call readiness verdict

How it works

Pause VPN and large uploads so the call quality test sees your real line
Run synthetic network probes — no microphone and no call recording
Compare latency, jitter, packet loss and upload against VoIP thresholds
Map the failing metric to a specific fix: Wi-Fi, DNS/VPN, ISP, or backup hotspot

Why this matters

Searches for “voip call quality test” usually come from people whose meetings already sound broken. A single Mbps number does not explain robotic voice, delayed replies or dropped syllables; jitter and loss do.

Top fixes

High jitter: switch from 2.4 GHz to 5 GHz Wi-Fi or ethernet
Packet loss: test ethernet, remove repeaters, or try a mobile hotspot
High latency: disable VPN, try 1.1.1.1 DNS, then compare another ISP path
Low upload: pause cloud backup, camera uploads and other calls on the same Wi-Fi
Only one app fails: compare WhatsApp, Zoom/Meet/Teams and SIP before blaming the ISP

FAQs

What is a VoIP call quality test?

It checks the network metrics that make internet calls clear or choppy: latency, jitter, packet loss and upload. A normal speed test can look fine while VoIP still fails.

How do I test VoIP call quality before a meeting?

Run Signalyzr on the same Wi-Fi or mobile data you will use for the meeting, with VPN and large uploads paused. If jitter or packet loss is high, switch network before joining.

What MOS do I need for calls?

4.0+ is good. 3.6–4.0 is usable but may have artifacts. Below 3.6 you should expect dropouts, delay or robotic voice.

Does faster internet improve VoIP quality?

Only if upload is genuinely too low. Most VoIP problems are jitter, packet loss, Wi-Fi interference, VPN routing or congestion rather than raw download speed.

Do you record my audio for this test?

Never. We don't request microphone access. The test uses synthetic network probes — no audio, no call recording.

Test VoIP quality →

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