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.

Free Internet Speed Test

Real download + upload + latency in 15 seconds — no app, no signup.

Most speed tests show you a single peak number and call it a day. Signalyzr's speed test measures sustained download and upload, real latency under load, jitter and packet loss — the numbers that actually decide whether your connection can carry a video call, a 4K stream, or a competitive game.

It runs in your browser. No app to install, no account to create, no advertising. Average run time is 15 seconds on Wi-Fi and 20 seconds on mobile data.

What this measures

Download speed — sustained, not just peak (Ookla-style methodology)
Upload speed — separately measured (Indian plans are usually 10–30% the download)
Latency — round-trip time to the nearest probe in Mumbai or Delhi
Jitter — variance of latency, the actual driver of video-call quality
Packet loss — % of probe packets that never came back
Carrier and ISP identification — Jio, Airtel, Vi, BSNL, ACT Fibernet, Hathway, Excitel, Tata Play

How it works

Pick the nearest probe server (Mumbai, Delhi NCR) via geo-DNS
Warm up TCP for 1 second so slow-start doesn't underreport your speed
Run 4 parallel download streams for 10 seconds and take the time-weighted median
Run upload streams in the same shape — symmetric measurement
Send 15 ping probes spread over 3 seconds — measure both base latency and jitter
Show you the result with plain-language interpretation (not just numbers)

Why this matters

A speed test is only useful if it's accurate. Most free tests under-report by 20–40% because they don't pre-warm TCP, use a single stream, or measure peak instead of sustained. Signalyzr matches Ookla's methodology with 4-stream parallel measurement and time-weighted aggregation.

Top fixes

If download is below your plan: restart router, then test wired vs Wi-Fi
If upload is much lower than download: check ISP plan asymmetry first
If latency is high but speed is fine: change DNS to Cloudflare 1.1.1.1
If jitter is high: switch from 2.4 GHz to 5 GHz Wi-Fi if available
If packet loss is non-zero: check for Wi-Fi interference or run wired

FAQs

Is this speed test as accurate as Ookla?

Yes. Signalyzr uses the same class of rigorous multi-stream methodology Ookla uses, and we verified parity within 5% on real Indian connections.

Do I need to install an app?

No. The speed test runs in your browser. The optional Android app exists for background diagnosis but the speed test itself is web-based.

Why does my speed test show less than my plan?

Common causes: (1) Wi-Fi loss between your phone and router — try wired or 5 GHz, (2) ISP throttling at peak hours — retest at 6 AM, (3) old router that can't keep up with your plan, (4) other devices using bandwidth in the background.

Why is upload always slower than download?

Most Indian broadband plans are asymmetric — they advertise 100 Mbps down but give you only 10–30 Mbps up. Check your plan's fine print. The asymmetry is the plan, not a problem.

Does the speed test work on mobile data?

Yes — but it will use 50–200 MB of data depending on your connection speed. We warn you before running on mobile data so you can decide.

Run free speed test →

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