Rhyme Dictionary & Songwriting Assistant
A tool for writing and practicing freestyle in Spanish. Type a word and get its perfect and assonant rhymes grouped by ending across more than 645,000 words; build your own board of endings; and write lyrics in an editor that counts each line's syllables, marks the rhyme scheme and suggests rhymes for the word under the cursor. Built with Next.js, TypeScript, Supabase and the Claude or Gemini API.
645k Words
Rhymes in 38 ms
Key Features
Everything you need to write lyrics that rhyme
Rhyme Finder
Type a word and get only the endings that rhyme with it, with filters for rhyme type, syllables, stress and part of speech.
My Board
Columns with the endings you use most, where you can add words by hand, even poetic licenses that don't strictly rhyme.
Lyric Composer
An editor that counts each line's syllables with synalepha to compare the flow between lines, and highlights repeated words.
Automatic Rhyme Scheme
Each line gets its letter (A, B, A, B…) based on how it actually ends, and the rhyme panel follows the word under your cursor.
AI Lyric Ingestion
Paste a song's lyrics and Claude or Gemini extract new vocabulary and real rhyme pairs, which you approve before they enter the dictionary.
Full Catalog
Every Spanish rhyme family in a virtualized view that scrolls smoothly even with hundreds of thousands of words.
Tech Stack
A custom phonetic engine on a modern web stack
Challenges and Solutions
Technical problems solved during development
A Spanish Phonetic Engine
Knowing whether two words rhyme requires transcribing them, splitting them into syllables and finding the stressed one; a bug there gives believable but wrong results.
Slow Search
Searching rhymes across hundreds of thousands of words took 1.7 seconds, and the free database paused itself, taking search down.
AI Can Make Things Up
If the AI misreads two or three lyrics, it fills the dictionary with invented words and rhymes without anyone noticing.
Counting Syllables Like a Musician
In a song, vowels between words merge (synalepha), so the grammatical count doesn't measure flow.
Source Code
Explore my projects on GitHub. This one includes the phonetic engine, the rhyme index, the composer and the AI ingestion.
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