Alliteration & Assonance Checker

Highlight alliteration, assonance, and consonance patterns in text for poetry and prose analysis.

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How it works

This tool scans your text for three types of sound repetition commonly used as literary devices in poetry, prose, and rhetoric.

• Alliteration — repetition of the same initial consonant sound across two or more nearby words. For example, "Peter Piper picked a peck" repeats the /p/ sound. The checker groups consonant clusters (e.g., "sh", "th", "ch") so "she sells sea shells" correctly identifies two separate alliterative groups.
• Assonance — repetition of vowel sounds within nearby words, regardless of consonants. For example, "the rain in Spain stays mainly on the plain" repeats the long /eɪ/ sound. The tool detects shared vowel nuclei across a sliding window of words.
• Consonance — repetition of consonant sounds at the end or middle of nearby words. For example, "pitter patter" shares the /t/ and /r/ sounds. This is subtler than alliteration because the repeating sound need not be at the start.

The analysis uses English phonetic rules to approximate sounds from spelling. It works best with English text but can catch patterns in other Latin-alphabet languages. All processing runs entirely in your browser — no data is sent to any server.

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