Free SEO Tools: Catalog and Limits
Six categories of tools, what each contains, how daily limits work, and what to check with the tools before launching promotion.
The platform has a large set of free SEO tools: from meta-tag analysis and indexing checks to text processing and network utilities. Registration is not required for most tools, but daily limits apply to guests.
Catalog
What is available by categories
| Category | Purpose | Examples |
|---|---|---|
| SEO Analysis | Check the page and the technical side of the site | Meta-tag analysis, snippet preview, redirect and SSL check, robots.txt and sitemap analysis, markup generator |
| Links and Visibility | Evaluate link profile and indexing | Broken link check, domain trust, page and site indexing check, competitor comparison |
| Text and Content | Prepare and check texts | Humanization, paraphrasing, uniqueness, keyword density, article generator |
| AI Analysis | Check text for signs of generation | AI detector, readability and coherence analysis, watermark detector |
| IP and Network | Domain and hosting diagnostics | WHOIS, DNS, port check, blacklists, domain age, CMS detection |
| Utilities | Small tasks at hand | Encoders, password and QR generators, image converters, JSON formatting |
Limits
Each tool has its own daily limit of launches, counted separately for every tool. Guests get from 10 to 30 launches per day (by IP), registration triples the limit, and Pro subscription removes it and opens detailed values where they are hidden from guests.
Tools are not linked to balance
Tool launches do not deduct money from the balance — this is a separate limit. Only position checks, full audits and paid Shield modes are charged to the balance; the free check quota is used first.Why this is useful before promotion
- Check the target page: meta tags, headings, speed. If the basics are not in order, links won’t help.
- Ensure the page is indexed — using the indexing check tool.
- Look at the competitor: domain comparison will show their link profile.
- Prepare texts and check uniqueness if you plan to post something manually.
How to use the tools
Breakdowns for each check: what it shows, how to read the result, and what to do with the findings.
| Article | About |
|---|---|
| How to check redirects and redirect chains | What redirect codes mean, the dangers of long chains and loops, what to look for in the checker report, and why lost 301s during migration are a common cause... |
| How to find broken links on the site | Where links to non-existent pages come from, how to read error codes, what to do with each finding, and why internal broken links are more important than external ones. |
| How to check if a page is indexed by Google | Three ways to check with their limitations, common reasons for a page not being indexed, and the order of actions that returns the page to search. |
| Checking robots.txt: what is closed and unnecessarily closed | What the file analyzer checks, five typical mistakes with consequences, why robots.txt does not remove a page from the index and does not protect data. |
| Sitemap sitemap.xml: check and typical errors | What should be in a proper map, which findings of the analyzer are really important, why the map does not replace interlinking, and how to keep it up to date. |
| Checking SSL certificate: validity, chain, protocols | What to look for in the check report, why the site may open for you and break for the robot, what to do with each error, and how it relates to promotion. |
| Checking domain DNS records | What A, CNAME, MX, TXT, and NS records mean, what to look for in each, when the check is necessary, and why changes are not applied instantly. |
| WHOIS: domain age and registration data | What fields are in WHOIS and what they provide in practice, why domain age is not equal to site age, when to perform the check, and why contacts are hidden. |
| ASN and IP address of the site: what the check shows | What an autonomous system is and why to look at which network the address belongs to: hosting diagnostics, IP adjacency, blacklists, and influence on positions. |
| On-page check of the page: what to look at first | What exactly the on-page analyzer checks, how to prioritize findings, and why it is pointless to invest in links while the basics on the page are broken... |
| Checking meta tags and preview in search results | Working guidelines on title and description length, typical mistakes, why Google rewrites snippets, and how to increase clickability without moving positions. |
| Online site screenshot: why and how to read metrics | When a page snapshot solves a task faster than any analyzer: rendering check, mobile version, capturing state before edits, and loading metrics next to... |
| How to find out what CMS the site is made on | What traces determine the engine, why the result is probabilistic, why this is needed when analyzing competitors and evaluating someone else's project — and why positions CM... |
| Checking favicon: why the icon is not visible in search | What the icon analyzer checks, what the search requirements are, three reasons why the favicon does not appear in mobile search results, and why this affects clicks. |
| Page load speed: what to measure and what to fix | Analysis of key indicators with guidelines, the order of fixes from the most beneficial to cosmetic, and an honest assessment of how speed affects positions. |
| Page link analysis: own and others' | What to check in the links of your page and what to check on someone else's site before placement, why the source code lies about rel, and how to maintain link hygiene. |
| Hidden watermarks and invisible symbols in text | What invisible traces remain in the text after generators and editors, how they interfere in practice, why their presence proves nothing, and how to clean ma... |
| Checking text for AI: how to read the result | What signs detectors look for, in what cases they make mistakes both ways, why a zero percent is not a goal, and what is really important for search. |
Texts, Links, and Page Technique
The second batch of breakdowns: working with text, link profile, and technical wrapping of the page.
| Article | About |
|---|---|
| Checking text uniqueness: how to read the result | What originality check looks for, why percentage is not a goal, how to distinguish harmless coincidences from copies, and what to do if someone copied you. |
| Text tone analysis | Formality, emotionality, confidence, and direction: what the breakdown shows, which tone suits different types of pages, and why bias in confidence... |
| Text readability: indexes and what to do with them | What readability formulas are based on, why their values for the Russian language are a guideline, not a verdict, five techniques for improvement, and why it is not worth fitting... |
| Keyword density: why to count today | Why there is no "optimal percentage", what the metric actually shows, how to read the frequency table, and what to do instead of fitting density. |
| Text coherence: why this is more important than word density | How the connection between paragraphs is measured, what breaks it, how to fix torn text, and why shortening often increases coherence better than adding. |
| Text processing: remove machine handwriting | What automatic processing changes, what it fundamentally does not do, in what cases it is appropriate, and in what order to work with a draft. |
| Spintax: text variations and when they are appropriate | How the record with variations is structured, where text reproduction is justified, and where it turns into doorway pages, and four rules without which it results in "delivery is carried out... |
| Article optimization for a query | Five steps from defining intent to own data, four typical findings of the optimizer, and why the first paragraph solves more than the rest of the text. |
| Keyword selection: where to start | Three sources that provide the most, how to categorize queries by page types, why frequency is not the main criterion, and how not to spawn unnecessary pages. |
| Checking domain trust | What is included in the overall assessment of the domain, why it is needed when buying a site and analyzing a platform, and why for donors other indicators are more important. |
| Collecting the site's link profile | How site crawling differs from link databases, what to look for in the result, where to see incoming links, and how to properly check the rel attribute of a specific link. |
| Internal linking: where links are missing | How to find missed connections between your pages, five rules for meaningful interlinking, and why this is the cheapest way to strengthen a page at the top threshold. |
| Comparing a page with competitors | Who to take for comparison, what signs to look at first, why copying the leader is pointless, and how to divide findings into quick and long-term. |
| Checking hreflang: typical markup errors | Six errors that disable language version markup, the order of checking one page of each version, and why hreflang does not raise positions. |
| Snippet preview: how the page looks in search results | Why length is counted in pixels, not characters, five points to check before publication, what to add to the snippet, and why search sometimes rewrites it itself. |
| Link card in social networks and messengers | The minimum set of Open Graph markup, four common problems with images and platform cache, and why an empty card costs you clicks. |
| Server response headers: what to look for | Response code, encoding, caching, compression, and hidden indexing prohibition in X-Robots-Tag — what to check in headers and when it saves from long searches for causes... |
| SEO of images: alt, weight, and sizes | What the image analysis checks, how to write alt and when to leave it empty, why weight is more important than description text, and in what order to sort images. |
Domain, Security, and Service Checks
The third batch of breakdowns: browser fingerprint, cannibalization, domain age, headers, compression, and cookies.
| Article | About |
|---|---|
| Browser fingerprint: what it reveals | What signs make up the fingerprint, why to check it, why attempts to hide make you more noticeable, and what this has to do with automatic pu... |
| Checking query cannibalization | How to see that several of your pages compete for the same query, where this comes from, what to do about it, and when overlap is not a problem. |
| Domain age: what it really means | The registration date says less than is commonly thought: it does not guarantee either a functioning site or an unchanged theme. |
| Checking security headers | Six headers that are enabled on the server and cost almost nothing, the order of implementation from safe to capricious, and why CSP should be run in mode... |
| Checking server response compression | Compression reduces text responses by three to five times with one server setting. |
| Checking cookies: flags, terms, and owners | What your site and third-party widgets set, what flags are mandatory for session cookies, common findings, and why the consent banner should be checked not only legally... |
Markup, subdomains, email, search features and AI bots
Practical guides to the jobs these tools were built for: what to check, in what order, and where a tool cannot tell you anything.
| Article | What it covers |
|---|---|
| How to Validate Schema Markup: Validators, Steps and Common Errors | Check structured data twice: the Schema Markup Validator (validator.schema.org) tells you whether it is correct schema.org, and Google’s Rich Results Test tells you wh… |
| How to Find Subdomains of a Domain: Certificate Logs, DNS and Their Limits | Search Certificate Transparency logs (crt.sh or Cert Spotter) for the domain: every publicly trusted HTTPS certificate is logged with the names it covers. |
| How to Read Email Headers: Find the Real Sender, the Delivery Route and Why Mail Went to Spam | Open the message source (in Gmail: ⋮ → Show original), read the Received lines from the bottom up to trace the route, and check Authentication-Results for SPF, DKIM an… |
| People Also Ask: How to Use It for Content and How to Get Into the Box | People Also Ask is Google’s box of related questions with short answers taken from ordinary pages. |
| How to Test if a Website Is Mobile Friendly Now That Google’s Mobile-Friendly Test Is Gone | Google retired its Mobile-Friendly Test in December 2023. |
| How to Block AI Bots in robots.txt (and Whether You Should) | Add a robots.txt group listing the AI training crawlers (GPTBot, ClaudeBot, CCBot, Google-Extended, Applebot-Extended and others) with Disallow: /, and leave AI search… |
Honest roundups of free tools
Comparisons with open criteria. Each one includes our own tool, and says so at the top.
| Article | What it covers |
|---|---|
| Best Free Reverse IP Lookup Tools (2026): 6 Options Compared | HackerTarget, YouGetSignal, DNSlytics, ViewDNS.info, SecurityTrails and our own tool compared by free limit, sign-up, data source and what each is best for. |
| Best Free Domain Age Checkers (2026): How They Differ and Which to Trust | ICANN Lookup, WhoisXML WHOIS History, the Wayback Machine, SmallSEOTools, Whois.com and our own checker compared: RDAP vs WHOIS, history, bulk checks and limits. |
| Best Free Meta Tag Checkers (2026): 6 Tools Compared | Screaming Frog, SEOmator, Metatags.io, Ahrefs Webmaster Tools, SEO SiteCheckup and our own analyzer compared by job: one page, a whole site or social previews. |
| Best Free Sitemap Validators (2026): What Each One Actually Checks | Google Search Console, Patrick Stox’s validator, Swetrix, Screaming Frog, XML-Sitemaps.com and our own analyzer compared: syntax, protocol rules, URL status and what G… |
| Best Free Invisible Character Detectors and Removers (2026): 6 Tools Compared | To find invisible characters, paste the text into a detector that shows each hidden character’s code point and position, then remove what you do not need. |
| How to Remove the Gemini Watermark: Best Free Ways (For Your Own Images) | To remove the visible Gemini sparkle from your own image, use a tool that subtracts it with reverse alpha blending on the original file; healing tools and cropping are… |
| Best Free Google Search Console Analyzers (2026): 7 Ways to Analyze Your GSC Data | To analyze Search Console data for free, start with the Performance report, then pick a tool for the limit you hit: 1,000 rows, missing query + page pairs or 16 months… |
FAQ
Списываются ли деньги за инструменты?
Нет, инструменты не связаны с балансом. У них отдельный суточный лимит запусков, который снимается подпиской Pro.
Нужна ли регистрация?
Для большинства инструментов нет, но у зарегистрированных лимит выше, а часть детальных значений видна только им.
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