A speed test that doesn't track you
What this is
Internet Sloth is a speed test. It measures your download speed, upload speed, latency, and jitter. The four numbers that actually tell you whether your connection is working.
No ads. No accounts. No third-party trackers. Free forever. The sloth just wants to know if you're getting what you're paying for.
Your test history lives in your browser. You can chart it, export it to CSV, or run tests on a timer to catch your connection at its worst. Our server keeps only an anonymous copy of each result, described below.
How we're different
- Ookla (Speedtest.net) sells your data. We don't.
- Google's in-page widget has no history. We save yours locally.
How we measure
Transfer tests run through a Cloudflare Worker on Cloudflare's network, usually at a location near you. It's not a server we own, and not one your ISP can host to make their numbers look better.
A short warmup estimates your speed before timing starts, and that estimate picks how many parallel streams the test uses. We then sample throughput every 500 ms, discard the slowest 25% of samples, and stop early once the result settles.
Latency is the median of 20 samples. Jitter is the mean absolute difference between consecutive samples (RFC 3550). It captures how much your latency bounces between requests, not just the overall range.
What touches the server
What gets sent
- Your speed results (download, upload, latency, jitter) and when the test ran
- A hashed version of your IP address (SHA-256 hashed, not reversible, never stored raw)
- A random ID generated in your browser. We use it to count how many people run tests and detect site issues. It has no connection to who you are.
- A note that a test started, with the same hashed IP and random ID, so we can see how many tests finish
If you contact us
The contact form sends your name, email, company, and message to our inbox (delivered by the email service Resend) and to our private Slack. We use them only to reply to you.
What does not happen
- No cookies
- No fingerprinting
- No third-party ad or analytics scripts
- Site analytics use Umami (open-source, self-hosted, no cross-site tracking, no cookies)
That's the whole story.
Run a speed test →Want the technical details? How we measure your speed →
Running an ISP review site or tech blog? There's an embeddable widget.
Interested in bringing InternetSloth's speed test to your ISP, business, or community? Let's talk →
Questions or bugs: sloth@internetsloth.com