Use an always-on device connected via Ethernet to ensure accurate, consistent broadband performance tracking without interference from wireless signals.
Install Speedtest CLI on your system and automate regular testing using a scheduled cron job for continuous monitoring.
Analyse CSV logs over several weeks to accurately identify congestion patterns, latency spikes, and recurring broadband speed drops.
Internet speeds rarely fail abruptly. Instead, they decline gradually, causing buffering during peak hours, pixelated video calls, and sluggish uploads when deadlines approach. If you want evidence instead of frustration, an automatic internet speed logger is the perfect tool to integrate into your daily setup.
Let’s take a look at the technical process and the prerequisites for this tool.
Choose a Device that stays on. An old laptop or desktop computer also serves the purpose. It has to be connected to the router using a cable. Wi-Fi causes fluctuations that affect the results.
Most systems use the official command-line tool provided by Ookla, the company behind Speedtest. It is installed using the Terminal on Ubuntu or Raspberry Pi OS.
Use a machine that runs continuously. A Raspberry Pi works. An old laptop or desktop also does the job. Connect it to the router with an Ethernet cable. Wi-Fi introduces fluctuations that can distort readings.
Most setups use Ookla’s official Speedtest command-line tool. Install it on Ubuntu or Raspberry Pi OS using the Terminal.
Run a test, once installed:
The system may display download, upload, and latency values. If those numbers appear, the tool works.
Write a simple Python script that runs the speed test and saves the output to a CSV file with a timestamp in the filename. Save the file and run it manually. A CSV file should appear in the same folder. Open it to confirm that the data has been recorded correctly.
A CSV file should appear in the same folder.
Also Read: What are the Accurate Ways to Test Internet Speeds in 2025?
A logger only works if it runs regularly. On Linux systems, use cron to schedule it. Open the cron editor and add a line that executes the script every 10 minutes. Adjust the file path if required. Once saved, the system performs tests automatically in the background.
Wait 20 to 30 minutes, then open the CSV file. You should see several rows, each with date, time, download speed, upload speed, and latency. If entries continue to appear, the automation works.
Import the data into Microsoft Excel, Google Sheets, or Libre Office. Create line charts for download and upload speed. Within a week, the patterns will reveal themselves. Data congestion will be consistent during weekdays and periods of latency. For a more in-depth analysis, you can import the data into Grafana to create a live dashboard.
Keep the data for at least a month. If the speed continues to decrease to levels below your plan, share the charts with your ISP’s support team. Numbers can change the tone of the conversation.
Also Read: Best Internet Providers in Hyderabad
An automatic internet speed logger replaces guesswork with important facts. Instead of complaining about your internet feeling slow, you can show your provider the actual reductions in download speeds or increases in latency. As days and weeks pass, you can see the pattern.
You can see when your internet service is experiencing congestion and how often your service isn’t meeting what you pay for. This works quietly in the background with minimal maintenance once it has been set up.
1. What is an automatic internet speed logger?
An automatic internet speed logger is a system that runs scheduled speed tests and records download, upload, and latency data over time.
2. Do I need a Raspberry Pi to set it up?
No, you can use any always-on device, such as an old laptop, desktop, or home server connected via Ethernet.
3. How often should the speed test run?
Running the test every 10 to 30 minutes provides consistent data without overloading your network or triggering ISP rate limits.
4. Will this improve my internet speed?
No, it does not improve speed. It only records performance so you can identify slow periods and document issues.
5. Can I use the data to complain to my ISP?
Yes, detailed logs and charts provide measurable proof of speed drops or latency spikes during specific time periods.