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Spotted an error, have a source to share or a tool to add? Write to us.
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Tell us the page, the sentence or figure at issue and, if possible, the source that contradicts it. Every article also has a “Report it” link that prepares this message. Corrections follow our corrections policy.
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For a tool to join the directory, send the link to its official page and its pricing page. We only publish information that can be checked against public sources.