Free SEO Tools: Four Checks Worth Running on Any Site
The four free SEO checks worth running on any website are its backlink authority, its actual ranking position for a keyword, the platform it is built on, and its technical health. Together they take about three minutes and answer the only question that matters at the start: is this site losing search traffic because of what it publishes, or because of something structural nobody has looked at?
Most free SEO tools are lead magnets first and tools second. They give you a number, hide the reasoning, and ask for an email before the interesting part. The bigger problem is that a number without context is worse than no number — it feels like information while quietly pointing you at the wrong work.
So here is what each of these four checks actually measures, what it does not measure, and the order to run them in.
1. Backlink authority: are you allowed to compete?
Domain Rating is a 0–100 estimate of how strong a website's backlink profile is. It goes up when other trusted sites link to you, and it climbs faster when those links come from many independent domains rather than repeatedly from the same few.
Two things people get wrong about it.
It is not a Google metric. Google has said repeatedly that it has no site-wide authority score of this kind. Every SEO platform crawls a different slice of the web and applies its own formula, which is why the same domain scores 34 on one tool and 41 on another. Neither is "true."
There is no good score in the abstract. A local plumber competing against other local plumbers does not need 60. The only comparison worth making is against the specific domains currently ranking for the keywords you want. Check three or four of them, and the gap you need to close becomes obvious — and is usually much smaller than people fear.
What authority genuinely explains is ceiling. If everything on page one for your target keyword sits at 55 and you are at 3, no amount of rewriting moves you there this quarter. That is not a reason to give up; it is a reason to target something less contested while the authority builds.
You can check any domain with the free Domain Rating checker.
2. Ranking position: where you actually sit, not where you think you do
Almost everyone checks their rankings by searching in their own browser. That number is close to meaningless, for a reason that is easy to miss: Google personalises results by location, language, search history and account — and your own site is the one you click most often, which pushes it up for you specifically.
People routinely believe they rank fourth when a stranger in the same country sees them at nineteen.
A rank checker queries a clean, unpersonalised result set for a chosen country and device. Two details make the output easier to read:
- Organic position counts only the blue links — that is the number people mean when they ask where they rank.
- Absolute position also counts ads, featured snippets, People Also Ask boxes and image packs. On a busy result page, organic position 3 can sit halfway down the screen.
Both are true. They answer different questions, and mixing them up is how people conclude a page "dropped" when the page did not move at all — Google simply inserted more above it.
The more useful half of a rank check is not your own number but the ten results above you. They tell you what Google currently believes the query deserves: a comparison table, a step-by-step guide, a product page, a forum thread. If every result is a 2,000-word guide and you published a 400-word product page, your problem is format, not authority. That is a fixable problem, and a much cheaper one.
Check any keyword with the free Google rank checker.
3. The platform: what you can change, and how fast
This is the check people skip, and it decides more day-to-day reality than the other three combined.
The CMS behind a site determines whether a given SEO fix is a settings toggle, a plugin, or a developer ticket that waits three weeks. Canonical tags, structured data, image formats, redirects, page speed — every platform handles them differently, and some barely let you touch them.
It also determines something people discover far too late: whether content tools can publish into the site automatically. Plenty of teams buy an AI writing tool, generate forty articles, and then find there is no path from the draft to a live page except a person copying and pasting. The articles sit in a folder. The traffic never arrives, and the tool gets blamed for a problem it never claimed to solve.
A good detector reads the page exactly as a browser would and looks for fingerprints the platform leaves behind — asset paths, generator tags, runtime globals, response headers. Worth knowing about the results:
- "Unknown" is a real answer. Custom-built and statically generated sites leave no fingerprint at all.
- Headless setups show the front end, not the CMS. If you see Next.js or Astro reported with no CMS, the content is probably coming from an API behind it.
- One mention is not evidence. A site that references a platform once in an integration script is not running that platform — a surprising number of detectors get this wrong.
Identify any site's stack with the free CMS detector.
4. Technical health: eligibility, not quality
A technical audit checks the machine-readable parts of a page — the things a search engine reads before it ever weighs your writing. Titles, meta descriptions, canonicals, indexability, headings, structured data, alt text, mobile viewport, robots.txt, sitemap, response time.
The distinction that makes this check useful: content decides whether you deserve to rank; technical SEO decides whether you are eligible to.
Most technical findings are small. One is not. A stray noindex tag left behind after a staging site goes live tells Google not to rank the page at all, and it is completely invisible unless you look for it. It survives redesigns, migrations and template changes, and it is the single most expensive mistake in this category — an entire section of a site can sit unindexed for months while everyone argues about content quality.
Treat the score as triage rather than a target. A page can score 100 and still not rank, because the audit measures hygiene and eligibility, not whether your page is better than the ones already there. Google's own SEO starter guide makes the same point in more words: the technical basics are table stakes, not a strategy.
Run one with the free technical SEO audit.
The order that saves you time
Run them in this sequence, because each one changes how you read the next:
- Technical audit first. If the page is not indexable, nothing else matters and you have your answer in ten seconds.
- Rank check second. Now you know whether you are invisible, close, or already competing — and what format Google is rewarding.
- Authority third. This tells you whether the gap you just saw is closable with content, or needs links first.
- CMS last. Once you know what to fix, this tells you how painful fixing it will be.
Reversing that order is how people spend a month rewriting a page that carries a noindex tag.
What none of these tools can tell you
Being honest about the limits, because the gap between what these numbers measure and what people read into them causes real wasted effort:
- Whether your content is any good. No automated check evaluates whether you actually answered the question better than the page currently ranking first.
- Whether the keyword is worth targeting. Position 1 for something nobody searches is worth less than position 20 for something they do.
- Why you dropped. Rankings move daily for reasons unrelated to anything you did. Direction over a month is signal; position on a Tuesday is noise.
- What to publish next. That comes from the queries people actually use, not from a health score.
Which is the honest limit of any free checker, including these. They tell you where you stand and what is structurally in your way. They do not do the work of publishing consistently — and consistency, not any individual number, is what moves organic traffic over a year.
Run the checks, then decide what to fix
Three minutes across four tools gets you a clear picture: whether the page can be indexed, where it actually sits, whether authority is the bottleneck, and how hard changes will be to ship.
All four are free, need no signup, and read only what a site already serves publicly to every visitor. Start with the full set of free SEO tools, or pick whichever question you have right now.
If the answer turns out to be "the technical side is fine, we just do not publish often enough" — that is the most common answer, and it is the one Serpling was built for: research, writing, images, schema and publishing straight into your CMS, on a schedule.