GravityHexa / tools
SEO tools
Free technical SEO tools that report what your pages actually return — no scores, no invented numbers.
Accessibility
Colour Contrast Checker
WCAG contrast ratios for foreground and background pairs, with what passes and what does not.
Free Open AccessibilityFocus Order Checker
Find positive tabindex values, unreachable controls and elements made focusable that should not be.
Free Open AccessibilityForm Label Checker
Find form fields with no label, and placeholders being used as one.
Free Open AccessibilityHeading Order Checker
Check that heading levels descend one step at a time and form a real outline.
Free Open AccessibilityLandmark and Page Structure Checker
Check the landmarks, skip link and language declaration a screen reader relies on.
Free Open AccessibilityLink Text Checker
Find links whose text says nothing on its own, and links sharing text while going different places.
Free Open AccessibilitySkip Link Checker
Check a page has a working skip link, and that its target exists and can actually receive focus.
Free Open AccessibilityTable Accessibility Checker
Check that data tables have headers a screen reader can use, and that layout tables say they are not data.
Free OpenAnalytics
A/B Test Sample Size Calculator
Work out how many visitors a split test needs before you start it, and how long that will take.
Free Open AnalyticsA/B Test Significance Calculator
Test whether a difference in conversion rate is distinguishable from chance, with the assumptions checked rather than assumed.
Free Open AnalyticsConversion Rate and ROAS Calculator
Conversion rate, cost per acquisition, ROAS and profit from one set of numbers, with the formula shown for each.
Free Open AnalyticsUTM Parameter Audit
Check a set of tagged URLs for inconsistent casing, missing parameters and tagged internal links.
Free OpenContent
Bulk Meta Description Checker
Check a list of meta descriptions for width, duplication and the things that stop them being used.
Free Open ContentBulk Title Tag Generator
Generate titles from a pattern across a list of pages, with each one measured and the truncated ones named.
Free Open ContentBulk Title and Description Checker
Check many titles or meta descriptions at once, measured in pixels rather than characters.
Free Open ContentContent Outline Generator
Reduce a draft to its headings with the length of each section, so the structure can be judged on its own.
Free Open ContentDuplicate Content Finder
Compare many pieces of text at once and find the near-duplicates, with a straight answer about what duplication costs.
Free Open ContentKeyword Clustering
Group a keyword list by the words the phrases share, turning a long export into a page plan.
Free Open ContentKeyword Combiner
Combine two or three keyword lists into every phrase, deduplicated.
Free Open ContentKeyword Intent Classifier
Sort keywords into informational, commercial, transactional, local and navigational by the modifiers they contain.
Free Open ContentKeyword and Phrase Extractor
Pull the recurring words and phrases out of a text, with two- and three-word phrases.
Free Open ContentMarkdown Table Generator
Turn pasted spreadsheet or CSV data into a Markdown or HTML table, with cells escaped properly.
Free Open ContentN-gram Analyzer
Find the two, three and four-word phrases a piece of writing repeats most.
Free Open ContentPage Content Extractor
Extract the readable text of a page as a crawler first receives it, before any JavaScript runs.
Free Open ContentPassive Voice Detector
Find sentences that are probably passive, with the rule that flagged each one so you can dismiss the wrong ones.
Free Open ContentReadability Checker
Flesch reading ease and grade level, with the sentences that drag the score down.
Free Open ContentReading Time Calculator
Estimate how long an article takes to read, with the reading speed it assumed stated openly.
Free Open ContentSEO Slug Generator
Turn titles into clean, readable URL slugs — one per line.
Free Open ContentStop Word Remover
Strip common words to see what a text is about — and a straight answer about why not to do it for SEO.
Free Open ContentText Cleaner
Strip the invisible characters and smart punctuation that word processors leave behind, and see exactly what was removed.
Free Open ContentText Similarity Checker
Compare two texts and see how much they overlap, with the shared passages listed.
Free Open ContentText Summariser
Pull out the sentences that carry the most of a document — extraction only, nothing is rewritten.
Free Open ContentTransition Word Checker
See which sentences signal how they connect, grouped by the relationship each one expresses.
Free Open ContentUTM Campaign Builder
Build correctly tagged campaign URLs and catch the mistakes that split your reporting.
Free Open ContentWord and Character Counter
Words, characters, sentences and reading time, broken down by paragraph.
Free OpenIndexing
Page SEO Audit
Run every technical check against one page and see what passes, what warns and what breaks.
Free Open IndexingURL Indexability Checker
Find out whether a page can be indexed, and exactly which signal is stopping it.
Free Open IndexingBulk Robots Directive Audit
Check a batch of URLs for noindex and nofollow, in the meta tag and in the header where nobody looks.
Free Open IndexingCrawl Log Analyzer
Paste server access logs to see which crawlers came, what they hit, and what status they got.
Free Open IndexingMeta Robots Tag Generator
Build a robots meta tag, with a warning on the combinations that backfire.
Free Open IndexingSitemap Index Generator
Build a sitemap index from a list of sitemap URLs, or split an oversized URL list into the sitemaps it needs.
Free OpenInternational
Hreflang Tag Generator
Build a complete hreflang set, with the self-reference and return tags that make it work.
Free Open InternationalHreflang Validator
Check the hreflang set on a live page: self-reference, codes, duplicates and x-default.
Free Open InternationalLanguage Attribute Checker
Check the page declares its language, that the tag is real, and that sections in other languages say so.
Free Open InternationalLanguage Code Lookup
Validate language tags and find the codes that are a language in one place and a country in another.
Free Open InternationalLocale Number and Currency Formatter
See how a number or a price reads in each locale, including where the same digits mean different values.
Free Open InternationalPunycode Converter
Convert internationalised domain names to ASCII and back, with homograph warnings.
Free Open InternationalRight-to-Left Support Checker
Check a page in Arabic, Hebrew, Farsi or Urdu declares its direction, and that mixed content is marked.
Free OpenOn-page
Broken Link Checker
Follow the links on a page and report which ones are broken, redirected or slow.
Free Open On-pageKeyword Density Checker
Count words and phrases in a piece of text, with no target density attached.
Free Open On-pageMeta Tag Analyzer
Read the title, description, canonical, robots directives and social tags a page declares.
Free Open On-pageSERP Snippet Preview
See roughly where a title and description will be cut off in search results.
Free Open On-pageAnchor Text Analyzer
See what every link on a page says, and which ones say nothing at all.
Free Open On-pageHeading Structure Checker
See a page's heading outline and find levels that are skipped or out of order.
Free Open On-pageImage Alt Text Checker
Check alt text on every image, distinguishing missing from deliberately empty.
Free Open On-pageLink Extractor
List every link on a page with its anchor text, destination and rel attributes.
Free Open On-pageNofollow and Link Rel Checker
See which links are nofollow, sponsored or ugc, which are internal, and which combinations do not make sense.
Free Open On-pageOn-Page Keyword Checker
See exactly where a target phrase appears on a page — title, headings, body, links, image alt — and where it does not.
Free Open On-pagePagination Markup Checker
Check a paginated page for the canonical and noindex mistakes that hide everything past page one.
Free Open On-pageText to HTML Ratio
Measure how much of a page is readable text against markup, with a straight answer about what the number means.
Free Open On-pageURL Structure Audit
Check a list of URLs for the structural problems that are cheap to fix now and expensive later.
Free OpenPerformance
PageSpeed Insights
Run a real PageSpeed Insights test and inspect Lighthouse performance metrics and available field data.
Free Open PerformanceCache Header Analyzer
Read a URL's caching headers and say plainly what browsers and proxies will do with them.
Free Open PerformanceCompression Checker
Check whether a response is compressed, and measure exactly how much is being wasted if not.
Free Open PerformanceHTML Page Size Analyzer
Break down what the HTML document is made of: markup, inline CSS and JS, comments.
Free Open PerformanceImage Format Advisor
See what format every image on a page uses, and which ones are in the wrong one.
Free Open PerformanceImage Lazy Loading Checker
Check which images defer loading, whether the first one should not, and which reserve no space.
Free Open PerformanceImage Optimisation Checker
Check image formats, lazy loading and responsive sources across a page.
Free Open PerformanceLayout Shift Checker
Find images and embeds with no declared size — the usual cause of a page jumping as it loads.
Free Open PerformanceRender Blocking Resource Checker
Find the scripts and stylesheets that hold up first paint, and which of them genuinely need to.
Free Open PerformanceResource Hint Checker
Audit preload, preconnect, prefetch and dns-prefetch hints, including the ones making the page slower.
Free Open PerformanceThird Party Resource Checker
List every other company a page loads from, what each costs in connection time, and who sees your visitors.
Free Open PerformanceWeb Font Loading Checker
Find the fonts a page loads, whether text is hidden while they arrive, and how many weights are being fetched.
Free OpenSchema
JSON-LD Validator
Check structured data for syntax errors and missing required properties.
Free Open SchemaSchema Markup Generator
Build valid JSON-LD for the types most sites need, without emitting incomplete markup.
Free Open SchemaBreadcrumb Checker
Check the breadcrumb trail a search result will show, and whether the markup matches the page.
Free Open SchemaStructured Data Extractor
List every schema item on a page across JSON-LD, microdata and RDFa, and find the ones that contradict each other.
Free OpenSocial
Hashtag Extractor
Extract hashtags from text and find the ones that will not work as tags.
Free Open SocialOpen Graph and Social Preview Checker
Check the tags that decide how a link looks when it is shared.
Free Open SocialOpen Graph and Twitter Card Generator
Generate the social sharing tags a page actually needs, without the duplicates that drift apart.
Free Open SocialSocial Media Character Counter
Count a post against every platform limit, with URLs and emoji counted the way each platform counts them.
Free Open SocialSocial Share Link Generator
Build plain share links for every platform — no third-party script, no tracking, works without JavaScript.
Free Open SocialTwitter Card Checker
See what a page will look like shared on X, including which values come from Open Graph.
Free OpenTechnical
HTTP Header Checker
See the response headers a URL returns, including indexing rules that never appear in the HTML.
Free Open TechnicalHTTP Status Checker
Check the status code, final URL and redirect count for a list of URLs.
Free Open TechnicalRedirect Chain Checker
Follow a URL hop by hop and see every redirect between the start and the final page.
Free Open TechnicalRobots.txt Generator
Build a robots.txt and see what each rule actually blocks before you publish it.
Free Open TechnicalRobots.txt Tester
Test whether specific URLs are allowed or blocked by a site's live robots.txt.
Free Open TechnicalWWW and HTTPS Redirect Checker
Check that http, https, www and non-www all end at one URL rather than four.
Free Open TechnicalXML Sitemap Generator
Turn a list of URLs into a valid sitemap, with the escaping done properly.
Free Open TechnicalXML Sitemap Validator
Check a sitemap parses, stays inside the limits, and lists URLs that belong in it.
Free Open TechnicalCIDR and Subnet Calculator
Expand a CIDR block into its range, mask and size, and check whether an address falls inside it.
Free Open TechnicalCanonical Tag Checker
Read a page's canonical and catch the contradictions that make it ignored.
Free Open TechnicalCharacter Encoding Checker
Check where a page declares its encoding, whether the declarations agree, and whether they arrive in time.
Free Open TechnicalContent Security Policy Builder
Build a CSP from the origins a page actually loads, in report-only form so it cannot break anything yet.
Free Open TechnicalCookie and Consent Checker
See which cookies a page sets before any consent, and whether their security flags are right.
Free Open TechnicalDMARC Record Checker
Parse a DMARC record and get a straight answer about what protection it actually provides.
Free Open TechnicalDNS Lookup
Look up A, MX, TXT, NS and other records, with the mail misconfigurations flagged.
Free Open TechnicalEmail DNS Checker
Look up a domain's MX, SPF, DMARC and DKIM records together, and say which are missing rather than guessing.
Free Open TechnicalFavicon Checker
Check which icons a page declares and which platforms have nothing to show.
Free Open TechnicalIframe Checker
List every embedded frame with its title, loading behaviour, sandboxing and permissions.
Free Open TechnicalMixed Content Checker
Find http:// references on an https:// page, split by what browsers block.
Free Open TechnicalMobile Viewport Checker
Check the viewport declaration and the mobile problems visible in the HTML.
Free Open TechnicalRSS and Atom Feed Discovery
Find the feeds a page declares, and check the usual paths for one it has but never advertised.
Free Open TechnicalRedirect Configuration Generator
Turn a redirect map into Apache, nginx, Caddy or Netlify configuration, with loops and chains refused first.
Free Open TechnicalRedirect Map Generator
Build Apache, Nginx or CSV redirects from a list, with loops and chains caught first.
Free Open TechnicalReverse DNS Lookup
Resolve IP addresses to hostnames and confirm a crawler with the forward-confirmed check the search engines document.
Free Open TechnicalSPF Record Validator
Check an SPF record for syntax errors and count the DNS lookups it costs against the limit of ten.
Free Open TechnicalSSL Certificate Checker
Check a certificate's expiry, issuer and whether it actually covers the hostname.
Free Open TechnicalSecurity Header Generator
Generate security headers for Apache, nginx or Caddy, with the two that can take a site offline flagged.
Free Open TechnicalWeb App Manifest Checker
Fetch a site's manifest and check the fields a browser needs before it will offer to install.
Free Open Technicalads.txt Validator
Check an ads.txt or app-ads.txt file line by line for the errors that silently cost revenue.
Free Open Technicalsecurity.txt Generator
Generate an RFC 9116 security.txt so vulnerability reports reach the right person.
Free OpenUtilities
List Cleaner
Deduplicate, sort and trim a list, and strip the invisible characters that break it.
Free Open UtilitiesBase64 Encoder and Decoder
Encode or decode Base64, in the standard or URL-safe alphabet.
Free Open UtilitiesByte Size Converter
Convert data sizes between every unit, showing both the powers-of-ten and powers-of-two readings.
Free Open UtilitiesCSS Minifier
Strip comments and whitespace from CSS without changing what any rule does.
Free Open UtilitiesCSV to JSON, Markdown or HTML
Convert CSV into JSON, a Markdown table or an HTML table, quoting handled properly.
Free Open UtilitiesCode Case Converter
Convert identifiers between camelCase, snake_case, PascalCase, kebab-case and more.
Free Open UtilitiesColor Converter
Convert colours between hex, RGB, HSL and HWB, with the luminance that contrast is calculated from.
Free Open UtilitiesCron Expression Parser
Explain a cron schedule in plain English and show the next times it will run.
Free Open UtilitiesData URI Generator
Turn SVG, CSS or text into a data URI, with a straight answer about when inlining costs more than it saves.
Free Open UtilitiesDate Difference Calculator
Work out the gap between two dates in days, weeks, months and working days, with the ambiguous units flagged.
Free Open UtilitiesEmail Address Validator
Check a list of addresses for syntax, mail-capable domains, typos and duplicates.
Free Open UtilitiesFind and Replace
Replace text across many lines and see exactly which ones changed before you use the result.
Free Open UtilitiesHTML Entity Encoder and Decoder
Escape HTML special characters, convert to named entities, or decode back.
Free Open UtilitiesHTML Minifier
Remove comments and whitespace from HTML without changing how the page renders.
Free Open UtilitiesHTML to Text Converter
Strip HTML to readable text, keeping paragraph breaks and dropping script and style.
Free Open UtilitiesHash Generator
MD5, SHA-1, SHA-256 and SHA-512 for comparing values and verifying downloads.
Free Open UtilitiesJSON Formatter and Validator
Pretty-print or minify JSON, and get the line and column when it will not parse.
Free Open UtilitiesJWT Decoder
Read the header and claims inside a JSON Web Token, with expiry times worked out.
Free Open UtilitiesList Comparison
Compare two lists and see what is in both, only in the first, or only in the second.
Free Open UtilitiesLorem Ipsum Generator
Placeholder paragraphs, sentences or words, in Latin or plain English.
Free Open UtilitiesMailto Link Generator
Build a mailto link with the subject, body, cc and bcc encoded the way mail clients actually read them.
Free Open UtilitiesMarkdown to HTML Converter
Convert Markdown to clean HTML, with everything escaped before it is parsed.
Free Open UtilitiesNumber Base Converter
Convert between binary, octal, decimal, hex and any base up to 36, at any size.
Free Open UtilitiesPassword Generator
Generate passwords or passphrases from a cryptographic source, with strength stated in bits.
Free Open UtilitiesRegular Expression Tester
Test a regex against sample text, with capture groups and catastrophic backtracking caught.
Free Open UtilitiesSQL Formatter
Lay out a SQL statement readably, and flag the SELECT *, the missing WHERE and the concatenated value.
Free Open UtilitiesString Escaper
Escape text for HTML, attributes, JavaScript, JSON, URLs, regular expressions or CSV.
Free Open UtilitiesTest Data Generator
Generate names, emails, addresses and other test data that uses reserved ranges nobody real owns.
Free Open UtilitiesText Case Converter
Convert a list between cases, with title case that keeps small words lowercase.
Free Open UtilitiesText Diff Checker
Compare two texts and see exactly what was added, removed and changed.
Free Open UtilitiesTime Zone Converter
Convert a time across zones with daylight saving handled, and a warning near the changeover dates.
Free Open UtilitiesURL Encoder and Decoder
Percent-encode or decode URLs and query values, one per line.
Free Open UtilitiesURL Parser
Break URLs into their parts and flag the pieces that cause duplicate pages.
Free Open UtilitiesUUID Generator
Generate v4 or time-sortable v7 UUIDs from a cryptographically secure source.
Free Open UtilitiesUnicode and Invisible Character Inspector
Find invisible characters, look-alike letters and smart punctuation hiding in a piece of text.
Free Open UtilitiesUnix Timestamp Converter
Convert Unix timestamps to readable dates and back, in any timezone.
Free Open UtilitiesWhatsApp Link Generator
Build a wa.me link with a pre-filled message, and get told plainly when a number cannot work.
Free Open UtilitiesXML Formatter and Validator
Pretty-print or minify XML, with the line and column when it will not parse.
Free OpenEvery tool here reports what your pages actually return. None of them produce a score out of 100, and none of them estimate a number they cannot measure.