astrina
No account needed for most of them

All 148 utilities

77 of them run entirely in your browser — nothing is uploaded and nothing is counted.

148utilities
77run in your browser
32also over the API
9categories

SEO 24

What search engines see, and what stops them.

Full site auditTechnical, speed and security in one pass. API SERP previewHow the snippet looks in search results. API Open Graph previewThe card shown when your link is shared. API Schema validatorValidates JSON-LD structured data. API Meta tag checkerTitle, description and og tags with lengths. API Keyword analysisDensity and frequency of words on the page. API Redirect checkerFollows 301/302 chains hop by hop. API Sitemap checkerValidates the XML sitemap and its index. API HTML validationStructural errors against W3C rules. API robots.txt analyserParses the file and resolves it per crawler. API Image checkerAlt text, dimensions and formats. API Broken imagesCrawls the site for images that fail to load. Account CMS detectorIdentifies the CMS and technology stack. API Readability analysisText difficulty and readability metrics. API Web VitalsLCP and CLS measured in a real browser on a throttled mobile profile, with TTFB and the render-blocking resources behind them. INP needs real visitors clicking, so that one still comes from Search Console. Hreflang checkerInternational markup, including return links. API Link analyserInternal, external and nofollow links. API Canonical checkerWhich URL the page declares as original. API robots.txt generatorBuild the file with a visual editor. ⚡ FAQ schema generatorFAQPage JSON-LD from questions and answers. ⚡ Broken linksFinds 404s, network errors and redirects. Account Server response checkerBulk HTTP codes and redirects. API Favicon checkerEvery size and format a browser looks for. API AI competitor analysisReads a rival page and says where you are behind. Counts are measured; there is no invented score, because a number a model made up would borrow the credibility of the ones we did measure. Pro

How the plans divide these up.

Opening a tool is not what costs us anything — volume is. Every tool that runs in your browser is free to everyone, forever, with no counter. What the plan decides is how much one run may cover, how many server-side runs you get a day, and whether results are kept, exported, scheduled or reachable from the API.

  • We do not run other people’s code. One tool on comparable lists is an online PHP editor that executes what you paste; Astrina formats PHP and reports syntax errors, and nothing is ever executed.
  • Tools that fetch a page identify themselves honestly and obey robots.txt.
  • Anything processed in your browser stays there — files are never sent to us.
See the table → API access

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