Same Free Promise.
No Paid Plans.

Partly. As of November 2026, Small SEO Tools offers many tools free: its plagiarism checker is free up to 1,000 words per scan, its paraphrasing tool up to 2,000 words and its grammar checker up to 5,000 words per check, and its AI Writer, AI Detector and AI Humanizer are listed as free with no sign-up. It also sells separate paid plans for seven tool families (plagiarism, paraphraser, image search, face search, image to text, domain authority checker and spam score) with higher limits, for example the Plagiarism Checker from $9.80 a month on monthly billing, and it says it offers no free trial. SEO Site Checker has no paid tier at all. Every tool is completely free with no paid plans and no credit card ever required. Some tools have per-file or per-word limits, and a free account raises many of them.

As of November 2026, we found none of these in the Small SEO Tools tools list: a WhoIs lookup, a DNS record lookup, a blacklist checker, an XML formatter or XML and JSON converter, HTML, CSS and JS minifiers, a QR code generator, a password generator, an image resizer, a word combiner, unit converters, and hex, ASCII or decimal binary converters (it lists only Text to Binary and Binary to Text). SEO Site Checker has all of these. Small SEO Tools does list a website SEO score checker, a domain authority checker, meta tag and Open Graph tools, a favicon generator, an image compressor and a JSON Viewer, so those are covered on both sites, though our domain authority checker shows Moz DA and PA when available and otherwise a free Common Crawl rank score. Which one fits depends on the tools you need.

No. SEO Site Checker is focused on website management and SEO tools, so it doesn't include a plagiarism checker. If you specifically need plagiarism detection, Small SEO Tools offers a free checker for up to 1,000 words per scan, with paid plans for higher limits (from $9.80 a month on monthly billing, as of November 2026). For plagiarism checking, you may also want to consider dedicated tools like Grammarly or Copyscape.

It depends on the tools you need. Both sites offer a website SEO score checker, a domain authority or link-rank checker, meta tag and Open Graph tools, a favicon generator and an image compressor, free. SEO Site Checker adds WhoIs, DNS record and blacklist lookups, XML tools and minifiers (see the developer tools), a QR code generator, a password generator, an image resizer and unit converters, all free with no paid plans. Small SEO Tools adds plagiarism, grammar, paraphrasing and AI writing tools, design tools such as logo and resume makers, and keyword and backlink tools, with paid plans for higher limits on some of them (as of November 2026). In our view, a site owner who needs the first list fits better on SEO Site Checker, and a writer or student who needs the second fits better on Small SEO Tools.

SEO Site Checker is ad-supported. Ad revenue keeps the platform permanently free for users. There are no hidden paid tiers, no freemium traps, and no plans to introduce premium features. The mission is to make professional SEO and website tools accessible to everyone, especially freelancers, students and small businesses who shouldn't need to pay for basic website management tasks.

No. You can use any tool as a guest, just visit the site and start immediately. Creating a free account (no cost, no credit card) unlocks full detailed reports, PDF downloads and higher file-size and word limits on many tools. Either way, the tools are free and there is no paid account tier.