Checkers
Validates and verifies data for correctness, compliance, or quality like checking if an email address is valid, verifying JSON syntax, testing password strength, or validating domain availability
Tools
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AI Writing Pattern Detector
Find and highlight the habits that make text sound AI-written.
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Bulk IBAN Validator
Check a whole list of IBANs at once with clear pass or fail results.
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IBAN Validator
Validate an IBAN and find out exactly why it fails.
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MIME Type Checker
Detect the MIME type of a file or URL accurately.
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SKILL.md Validator
Validate SKILL.md frontmatter and body against the Agent Skills spec.
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Robots.txt Tester
Check which URLs a robots.txt allows or blocks for any bot.
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Online Guitar Tuner
Chromatic microphone tuner with reference tones.
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Guitar Chord Finder
Chord diagrams for every root and chord type.