Free SEO checker alternatives, compared honestly
Five tools, what each is actually for, and a straight answer on which to use when — including when the answer is not us.
If you are looking for an alternative to Seobility, the IONOS website checker or SEOptimer, the useful question is not which is best — it is which of them does the job you actually have. These tools are less interchangeable than their marketing suggests, and one of the five below is not an SEO tool at all. Here is what each is genuinely for, written by one of the competitors.
Seobility
A mature German SEO platform with a genuinely useful free tier. It crawls a whole site rather than a single page, which puts it ahead of most free tools, and the paid product includes rank tracking, backlink monitoring and ongoing site auditing that have been developed over years.
Where it is genuinely better than us: whole-site crawling on the free tier, and a far deeper paid product. If you want one tool that tracks rankings over months and monitors backlinks alongside technical auditing, Seobility does that and we do not.
Why people look for an alternative: the free tier caps how much it will crawl and how often, the interface carries a lot of SEO vocabulary, and the reports are dense enough to need some fluency to act on. seobility.net
IONOS Website Checker
IONOS is a large European hosting and domains company, and their website checker is a free tool attached to that business. It gives a quick score and a readable summary aimed at small business owners rather than specialists.
Where it is genuinely better than us: brand trust and continuity. IONOS is an established company with support staff, and if you already host with them the checker sits alongside tools you use anyway. For a non-technical owner who wants one supplier for hosting, domain and basic SEO advice, that convenience is real and we cannot match it.
Why people look for an alternative: the checker exists to introduce you to IONOS products, so the depth stops where the upsell starts, and the recommendations tend toward the general. ionos.com website checker
SEOptimer
The closest competitor in this list to what we do: paste a URL, get a graded report covering on-page SEO, performance, usability and social. Its real business is agencies — white-label reports under your own branding and an embeddable audit form that captures leads on your site.
Where it is genuinely better than us: the agency tooling. White-labeling, embeddable lead-capture audits and bulk reporting are a complete product line we have nothing equivalent to. If you audit client sites for a living, that is the deciding factor and it points at SEOptimer.
Why people look for an alternative: the free report holds some detail back behind an email or an account, and the grading is tuned for a client-facing document rather than a working fix list. seoptimer.com
ScamAdviser
Worth including because people find it while searching for a website checker, and it is answering an entirely different question. ScamAdviser rates whether a site is trustworthy — domain age, registration details, reviews, known fraud signals — for shoppers deciding whether to enter a card number.
Where it is genuinely better than us: at its actual job, completely. If you want to know whether an unfamiliar shop is legitimate, use ScamAdviser. We do not assess trustworthiness and never will.
Why it is not an alternative: a perfect trust score says nothing about whether you rank, and our score says nothing about whether you are a scam. Different tools, different questions. scamadviser.com
SiteFaults
Ours, so discount accordingly. It runs 91 checks across performance, technical SEO, accessibility and AI search readiness on any public URL in about thirty seconds, with no account and nothing held back behind an email. Every finding is written in plain English with the specific fix.
The part none of the four above cover is AI visibility: whether ChatGPT, Perplexity and Google AI Overviews can reach and quote your pages. That is a real gap in the category right now, and it is where we have put the work — what an AI visibility checker does explains what is actually being tested.
Where we fall short, honestly: three things. We audit a page and its immediate crawl rather than exhaustively crawling a large site, so Seobility beats us there. We have no rank tracking or backlink data at all. And we are new, with no track record — the others have years of it, and that is a reasonable thing to weigh.
| Tool | Built for | Signup | Main limitation |
|---|---|---|---|
| Seobility | Whole-site crawling, rank and backlink tracking | Account for full features | Free tier capped, dense interface |
| IONOS Website Checker | Quick score for small business owners | None for basic check | Depth stops where the upsell starts |
| SEOptimer | Agency and white-label client reports | Email for full report | Detail gated, report-first grading |
| ScamAdviser | Website trust and fraud checking | None | Not an SEO tool at all |
| SiteFaults | Plain-English fixes and AI visibility | None | New, no rank or backlink data |
Which one to pick
- You need a full-site crawl for free: Seobility.
- You produce reports for clients: SEOptimer.
- You already host with IONOS and want it in one place: the IONOS checker.
- You want to know if a shop is a scam: ScamAdviser.
- You want a prioritized fix list, or you need to know whether AI assistants can read your site: ours.
They are also free, which means the comparison is less binding than it looks — running two takes a minute and tells you more than any comparison page, including this one.
What to check before trusting any free checker
Three questions, applied to all five above and to anything else you find. Does it show every issue it found, or blur a count of “47 more” behind a signup? Does it explain the fix, or only name the problem? And does it distinguish severity — a missing meta description and an unindexable page should never appear in the same list at the same weight.
A tool failing all three is a lead capture form in an audit’s clothing. What counts as a good SEO score covers why the number matters less than the list underneath it.
Try ours in thirty seconds
Run a free check on any URL — no account, no card, nothing withheld. If it does not tell you something useful, one of the four tools above probably will, and this page has tried to say which.
Frequently asked questions
- What is a good free alternative to Seobility?
- The best Seobility alternative depends on what you use Seobility for. If you need whole-site crawling with rank and backlink tracking, Seobility's free tier is still one of the strongest options and most alternatives are a step down. If you want a fast prioritized fix list with no account and no capped crawl, a lighter checker such as SiteFaults or SEOptimer covers that better.
- Is the IONOS website checker any good?
- The IONOS website checker is a reasonable quick check for a non-technical site owner, and it carries the trust of an established hosting company. Its limitation is purpose: it exists to introduce you to IONOS products, so the analysis stops short of the depth a dedicated SEO tool provides and the recommendations stay fairly general.
- What is a free SEO checker like SEOptimer?
- SEOptimer's closest free equivalents are tools that scan a single URL and return a graded, readable report — SiteFaults and the IONOS website checker both work this way. The feature that sets SEOptimer apart is its agency tooling: white-label branded reports and an embeddable audit form for capturing leads, which most free alternatives do not offer at all.
- Is ScamAdviser an SEO tool?
- No. ScamAdviser rates whether a website is trustworthy or likely fraudulent, using signals such as domain age, registration details and reviews. It is aimed at shoppers deciding whether to buy from an unfamiliar site. It does not assess SEO, page speed or search visibility, so it is not an alternative to an SEO checker despite often appearing in the same searches.
- Do free SEO checkers hide results behind a signup?
- Many do. A common pattern is showing a handful of issues and then blurring a count of the rest until you create an account or enter an email address. Before trusting any free checker, confirm three things: that it shows every issue it found, that it explains the fix rather than only naming the problem, and that it ranks findings by severity.
- Which free SEO checker tests AI visibility?
- Very few. Seobility, IONOS and SEOptimer focus on traditional SEO factors and do not report whether AI crawlers such as GPTBot, ClaudeBot or PerplexityBot can reach your pages. SiteFaults includes AI crawler access, structured data and llms.txt checks alongside the standard audit, which is currently the main gap it fills in this category.