We scanned the same keyword over and over. The difficulty score wouldn't hold still.

Every SEO tool hands you a "keyword difficulty" number and shows it to you like it's a fact carved in stone. Type in a keyword, get a score, plan your whole strategy around it. Here's the thing nobody tells you: that number isn't fixed. We measured the same keywords more than once, and the answers moved — a lot.

I'll start with the one that made me stop and stare. We checked the keyword "seo agency near me" on different days. One scan said the top results had 532 other websites linking to them. Another said 9,183. Same keyword. Same tool. Seventeen times the difference.

"We scanned the same keyword twice and got 532 and 9,183. That's the difficulty number the whole industry quotes like it's fixed. It moved seventeen times over."

And it wasn't a fluke. Here are the biggest swings we found:

Why does it move so much?

The number that drives "difficulty" is basically this: how many other websites link to the pages currently ranking at the top. More links pointing at the leaders means they're harder to beat. That part is sound.

The problem is the word currently. The score is a snapshot of whoever happens to be sitting in the top few spots the moment you check. Google shuffles those results constantly. So the day one giant, heavily-linked website is ranking, the difficulty looks enormous. The day it slips out and a smaller site takes its place, the same keyword suddenly looks easy. Nothing about the keyword changed. Only the snapshot did.

So when a tool gives you a single tidy score, it's freezing one frame of a movie and calling it the whole film.

Why I'm publishing this when it undercuts my own product

Here's the uncomfortable part. My company builds an SEO tool. It uses this exact same measurement. So writing this — pointing out that the measurement wobbles — makes my own product look less certain.

I'm doing it anyway, for a simple reason. If a number can't survive me telling you its weakness, it has no business being in a headline in the first place. The honest move is to treat difficulty as a rough range, not a precise verdict. Scan a keyword more than once. Actually look at who's ranking before you commit. The manual look beats the tidy score every time.

That's not a comfortable thing for a software company to say. It's just true.

This is one of three findings from our keyword research. We also found that two ways of saying the same thing can be thousands of times harder to rank for — and we ran the whole thing on our own site first.