Help me set up Zero — a free tool that lets you find and use extra services you don't have built in (image/video generation, search live social media, or hosting a free webpage). …To setup manually, read Installation Guides
Checks the HTTP status of the sitemap referenced by a canonical URL object on a given page.
Checks the meta-robots directive value on a sitemap object for a given URL.
Checks the meta-robots tag value on paginated pages of a given URL, returning an SEO crawlability finding.
Checks the meta-robots tag value found on an image object at a given URL for SEO crawl and indexing analysis.
Checks whether a sitemap object has a self-referencing canonical address (i.e. the canonical URL points to itself).
Checks whether a given sitemap URL is itself listed (included) in another sitemap or sitemap index.
Checks whether a pagination page URL has a self-referencing canonical tag pointing to itself
Checks whether a video object (page) is present/included in the website's XML sitemap.
Checks whether a given page URL is listed (contained) in the website's sitemap.
Checks whether a webpage's canonical tag correctly points to itself (self-referencing canonical URL) on a given target URL.
Checks whether a video resource URL is permitted to be crawled according to the site's robots.txt file
Checks whether the canonical URL of a given page is permitted (not blocked) by the site's robots.txt rules.
Checks whether a given parameterized URL is included in the target website's sitemap.
Checks whether a canonical URL is included in the target website's XML sitemap.
Checks whether a parameterized URL is technically indexable by search engines (e.g. not blocked by robots.txt, noindex directives, or other crawl barriers).
Checks whether a given URL (with parameters) is allowed to be crawled according to the site's robots.txt file
Returns the local relief (max minus min sampled surface elevation) for a given coordinate within Romania, validated against Natural Earth boundaries.
Returns the standard deviation of sampled surface elevations (terrain ruggedness index) for a given WGS84 coordinate within Bulgaria.
Returns the mean SoilGrids bulk density for the 0-5 cm topsoil layer at a given WGS84 coordinate within Romania, rejecting coordinates outside the country boundary before charging.
Returns the mean SoilGrids silt fraction for the 0-5 cm soil layer at a given WGS84 coordinate within Hungary, validated against the Natural Earth boundary.
Returns the combined share of permanent water, herbaceous wetland, and mangrove land-cover classes for a given coordinate within Romania.
Returns the positive elevation difference between a neighborhood mean elevation and the center cell elevation (depression depth) for a given coordinate in Cyprus.
Returns the mean SoilGrids coarse-fragment volume (volumetric %) for the 0-5 cm soil layer at a given WGS84 coordinate within Romania.
Returns the standard deviation of sampled surface elevations for a given coordinate within Croatia, quantifying terrain ruggedness at that location.
Returns the circular direction of the dominant surface gradient (aspect) at a given coordinate, clockwise from north, validated against Bulgaria's boundary.
Returns the mean SoilGrids cation exchange capacity (CEC) for the 0–5 cm soil layer at a given coordinate within Hungary.
Returns the standard deviation of sampled surface elevations (terrain ruggedness index) for a given coordinate within Cyprus.
Returns the mean SoilGrids total nitrogen content for the 0-5 cm soil layer at a given coordinate within Bulgaria.
Returns the combined share of permanent water, herbaceous wetland, and mangrove land-cover classes for a given coordinate within Croatia.
Returns the mean SoilGrids organic carbon value for the 0-5 cm depth layer at a given coordinate within Cyprus, validated against Natural Earth boundaries.
Returns the standard deviation of sampled surface elevations (terrain ruggedness index) for a given coordinate within Hungary.
Returns the mean SoilGrids silt fraction for the 0-5 cm soil layer at a given coordinate within Bulgaria, validated against the Natural Earth boundary.
Returns the mean first-order surface gradient (slope) across the analysis grid for a given coordinate within Croatia's boundary.
Returns the mean SoilGrids clay fraction for the 0–5 cm soil layer at a given coordinate within Cyprus, validated against Natural Earth boundaries.
Returns the circular direction of the dominant surface gradient (aspect), measured clockwise from north, for a given coordinate within Croatia.
Returns the mean SoilGrids total nitrogen content for the 0-5 cm soil layer at a given coordinate within Croatia, validated against Natural Earth boundaries.
Checks the submission target domain (Zieldomain) of HTML forms found on a given web page or URL.
Checks the submission target domain (Zieldomain) of an input field element on a webpage.
Checks the HTTP form submission method used by a pixel element on a given webpage.
Checks the target domain of form submission as observed in cookies on a given web page.
Inspects a web page's cookie-related form elements and checks which HTTP method (GET/POST) is used by those forms.
Inspects a banner object on a web page and reports which HTTP form method it uses for submission.
Checks whether a web form (formular) has proper field labels present, returning an audit finding on label availability.
Checks a web page object for the presence and properties of field labels on forms.
Checks whether a form submission object on a webpage has properly labeled input fields (Feldbeschriftung).
Analyzes a product's price history array to detect whether a new all-time low price has been reached
Checks a food product for active recalls or safety alerts, returning structured recall status information.
Analyzes a series of observed article prices to determine whether a new all-time high price has been reached relative to a previous high.
Generates a comprehensive on-chain report for a given ERC-20 token contract, including optional upgrade history, across major EVM chains.
Validates whether vehicles with specific licenses can satisfy the license requirements of jobs within a vehicle routing problem context.
Returns bridge transaction volume and activity metrics for a specified L2/L3 blockchain chain over a 24-hour or 7-day window
Estimates the current gas cost in USD for a specific transaction type (transfer, ERC-20, or swap) on Ethereum or Base.
Compares two document snapshots and exports the diff as a Word or CSV file
Computes a subtitle/caption cue gap index for a video or audio file, measuring coverage gaps between caption cues to assess caption quality.
Generates an edit decision list (EDL) from a video file, identifying cut points and scene boundaries for non-linear editing workflows.
Compares two video edit decision list (EDL) snapshots to detect and report differences between editing states across cuts, transitions, and timing.
Returns relative runoff tendency for a coordinate in Denmark, derived from terrain slope and surface ruggedness.
Returns the combined fractional share of permanent water, herbaceous wetland, and mangrove land-cover classes for a coordinate point within Norway.
Returns the positive elevation difference between a neighborhood mean and the center cell elevation, indicating topographic depression depth at a given coordinate within Finland.
Returns the positive elevation difference between a neighborhood mean and the center cell elevation, quantifying topographic depression depth at a given coordinate in Denmark.
Returns a relative runoff tendency score for a WGS84 coordinate in Finland, derived from terrain slope and surface ruggedness, with boundary validation against Finland's Natural Earth polygon.
Returns the maximum adjacent-cell surface gradient (slope) for a given coordinate within Sweden's boundary, computed across an analysis grid.
Returns the maximum adjacent-cell surface gradient (steepest slope) across the analysis grid for a given coordinate within Iceland.
Returns a south-facing slope orientation index derived from aspect and slope for a given coordinate in Iceland, validated against the Natural Earth Iceland boundary.
Returns a south-facing slope orientation index derived from aspect and slope data for a given coordinate within Malta.
Returns the combined share of permanent water, herbaceous wetland, and mangrove land-cover classes for a given coordinate in Italy, derived from ESA WorldCover 2021 data.
Returns the mean SoilGrids sand fraction (g/kg) for the 0–5 cm topsoil layer at a given coordinate within Malta.
Returns the positive elevation difference between the neighborhood mean and the center cell elevation (depression depth) for a given coordinate within Greece.
Returns the positive difference between neighborhood mean elevation and center-point elevation for a given coordinate within Portugal, measuring topographic depression depth.
Checks the proportion of modern image formats served in an API response object from a given URL.
Measures and reports the time-to-first-visible-render (renderstart) for a video resource at a given public URL.
Measures time-to-first-byte (TTFB) for redirect (Weiterleitung) objects at a given URL, returning performance timing data.
Measures the Time to First Byte (TTFB) for a specific image resource at a given URL, reporting how long the server takes to begin delivering the image.
Measures the TLS handshake negotiation time for a given web page URL, returning a performance finding for the 'seite' (page) object type.
Measures the Time to First Byte (TTFB) for an iframe element loaded from a given public URL.
Checks the proportion of modern image formats served via a redirect target URL or object.
Checks the number of loaded resources (request count) for a script object on a given web page or URL.
Measures the time to first visible render start (Time to First Paint) for a given public web page URL.
Measures the time-to-first-render (Renderstart) for a stylesheet resource on a given public URL, returning a performance finding.
Measures the time-to-visible-render-start (first paint) for a script object at a given public URL.
Checks what proportion of images referenced in a stylesheet use modern formats (e.g. WebP, AVIF) as a web performance audit finding.
Measures the time-to-first-render (render start) of an iframe object on a given web page, returning a performance audit result.
Measures and audits the TLS negotiation time for a video resource at a given public URL.
Measures and evaluates the TLS handshake/negotiation time for iframe objects on a given web page.
Measures and returns the total load time (Gesamtladezeit) for a video resource at a given public URL.
Checks the proportion of modern image formats used in a document object on a given URL.
Measures the Time to First Byte (TTFB) for a given public HTTP(S) document URL and returns the findings.
Checks the number of loaded resources for an image object at a given public URL, as a web performance audit finding.
Checks the number of render-blocking script resources on a given web page or specific script element.
Checks the transferred byte size (page weight) of a webpage or specific page element via HTTP audit
Checks a web page for the proportion of images served in modern formats (e.g. WebP, AVIF) versus legacy formats.
Checks what proportion of images loaded within iframes on a webpage use modern image formats (e.g. WebP, AVIF).
Measures and reports the connection establishment time (Verbindungsaufbauzeit) for font/text resources (Schrift objects) at a given URL.
Measures and checks the connection establishment time (Verbindungsaufbauzeit) of an API response endpoint via HTTP(S).
Measures the total load time (Gesamtladezeit) of a redirect (Weiterleitung) object at a given URL, returning a performance finding.
Measures and checks the total load time (Gesamtladezeit) of iframe objects on a given web resource.
Measures and checks the TCP/TLS connection setup time (Verbindungsaufbauzeit) for an image resource at a given public URL.
Checks and measures the total load time (Gesamtladezeit) of a document resource at a given public URL.
Measures and reports the Time to First Byte (TTFB) for a stylesheet resource at a given public URL.
Measures and reports the TCP/TLS connection establishment time for a given document URL