WatRijmtOp.nl is a free Dutch-language rhyme resource designed to help writers find words that fit by sound, not merely by spelling. Its index contains 407,980 Dutch words, with pronunciation-based results organized into perfect rhyme, rich rhyme, half-rhyme and assonance. Word pages also show phonetic spelling and syllable counts, helping users assess how words sound and fit into a line.

The site offers a range of writing and language tools, including a rhyme generator, rhyme checker, syllable tool, word counter, anagram finder, word-family searches and rhyme-scheme support. Visitors can browse words from A to Z, explore popular rhyme searches, and use examples, writing tips and a rhyme coach to improve poems and lyrics. Occasion-specific resources support verse for celebrations such as Sinterklaas, Christmas, birthdays and weddings. The site also features word games and daily challenges.

WatRijmtOp.nl is available without registration or a paywall, and it invites users to suggest missing words for review. The website identifies itself as a product of Marketingbende and supports its free service with advertising.