> For the complete documentation index, see [llms.txt](https://api-docs.speechace.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://api-docs.speechace.com/features/scripted-activities/lexical-stress-and-intonation.md).

# Lexical stress and intonation

{% hint style="info" %} <mark style="color:blue;">**This feature is available as part of the Pro Plan.**</mark>
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The Speechace API also provides a way to measure lexical stress and intonation in a user's pronunciation of a word or sentence. In teaching pronunciation, lexical stress involves emphasizing certain syllables in words to clarify meaning, while intonation refers to pitch variations that convey emotional tone and intent. Please utilize the [Score Text/Stress & Intonation](/api-reference/score-text-stress-and-intonation.md) function to obtain stress and intonation quality scores.