--- title: The Eleven Languages My App Can Describe But Not Pronounce description: A developer building a language-learning app that supports 91 languages shares the evolving technical constraints encountered along the way. The post traces... canonical: https://daily.dev/posts/the-eleven-languages-my-app-can-describe-but-not-pronounce-v1a1ctrqe twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: The Eleven Languages My App Can Describe But Not Pronounce | daily.dev og:description: A developer building a language-learning app that supports 91 languages shares the evolving technical constraints encountered along the way. The post traces... og:url: https://daily.dev/posts/the-eleven-languages-my-app-can-describe-but-not-pronounce-v1a1ctrqe og:image: https://api.daily.dev/og/posts/v1a1ctrQE.png og:image:alt: The Eleven Languages My App Can Describe But Not Pronounce og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # The Eleven Languages My App Can Describe But Not Pronounce **[Medium](https://daily.dev/sources/medium_js)** · 9 min read · 0 upvotes · 0 comments ## Summary A developer building a language-learning app that supports 91 languages shares the evolving technical constraints encountered along the way. The post traces three successive frontiers: linguistic knowledge (now nearly free thanks to AI), text rendering (Unicode glyph coverage, font cascades, CJK regional forms, and load performance), and audio/TTS (11 languages still lack any synthetic voice). Key engineering lessons include runtime detection of TTS provider failures instead of hardcoded configs, per-language profiles replacing brittle conditionals in lesson-generation pipelines, and the subtle ways a development machine's font stack masks rendering bugs. Practical advice for learners of less-common languages is also included: verify rendering before committing to a tool, check TTS availability periodically, anchor to native audio, and use media as a syllabus when no course exists. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [How AI Can Become Your Personal Language Tutor](https://daily.dev/posts/how-ai-can-become-your-personal-language-tutor-tma1s5z4r) · Towards Data Science · 1 upvotes · 0 comments - [15 Translation APIs for Localization and Global Apps](https://daily.dev/posts/15-translation-apis-for-localization-and-global-apps-mq4ewxld9) · Nordic APIs · 0 upvotes · 0 comments - [AI and minority languages](https://daily.dev/posts/ai-and-minority-languages-fdldafgbu) · thoughbot · 0 upvotes · 0 comments --- Tags: [#webdev](https://daily.dev/tags/webdev), [#nlp](https://daily.dev/tags/nlp), [#text-to-speech](https://daily.dev/tags/text-to-speech) [View this post on daily.dev](https://daily.dev/posts/the-eleven-languages-my-app-can-describe-but-not-pronounce-v1a1ctrqe) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"The Eleven Languages My App Can Describe But Not Pronounce","url":"https://daily.dev/posts/the-eleven-languages-my-app-can-describe-but-not-pronounce-v1a1ctrqe","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/the-eleven-languages-my-app-can-describe-but-not-pronounce-v1a1ctrqe"},"datePublished":"2026-07-22T13:49:08.287Z","dateModified":"2026-07-22T13:51:13.111Z","description":"A developer building a language-learning app that supports 91 languages shares the evolving technical constraints encountered along the way. 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