{"id":13037,"date":"2026-03-19T07:00:00","date_gmt":"2026-03-19T14:00:00","guid":{"rendered":"https:\/\/typecast.ai\/learn\/?p=13037"},"modified":"2026-04-01T01:41:35","modified_gmt":"2026-04-01T08:41:35","slug":"best-api-ssml-support","status":"publish","type":"post","link":"https:\/\/typecast.ai\/learn\/best-api-ssml-support\/","title":{"rendered":"Which Text-to-Speech APIs Offer the Best SSML Support?"},"content":{"rendered":"\n<p>When building voice-enabled applications, API SSML support can make the difference between robotic-sounding audio and natural, expressive speech.<\/p>\n\n\n\n<p>Understanding which text-to-speech platforms offer comprehensive SSML capabilities is essential for developers seeking precise control over speech output.<\/p>\n\n\n\n<p><strong>Speech Synthesis Markup Language<\/strong> (SSML) allows developers to fine-tune pronunciation, pacing, emphasis, and emotional tone.<\/p>\n\n\n\n<p>Without robust SSML support in APIs, creating professional-grade voice experiences becomes significantly more challenging. Let&#8217;s explore the leading platforms and evaluate their SSML capabilities.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What is SSML and why does it matter?<\/h2>\n\n\n\n<figure class=\"wp-block-image size-large\"><img data-dominant-color=\"c8d8dd\" data-has-transparency=\"false\" style=\"--dominant-color: #c8d8dd;\" loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/typecast.ai\/learn\/wp-content\/uploads\/2026\/03\/26q1_blog9a-1024x576.webp\" alt=\"Different coding languages.\" class=\"wp-image-13029 not-transparent\" srcset=\"https:\/\/typecast.ai\/learn\/wp-content\/uploads\/2026\/03\/26q1_blog9a-1024x576.webp 1024w, https:\/\/typecast.ai\/learn\/wp-content\/uploads\/2026\/03\/26q1_blog9a-300x169.webp 300w, https:\/\/typecast.ai\/learn\/wp-content\/uploads\/2026\/03\/26q1_blog9a-768x432.webp 768w, https:\/\/typecast.ai\/learn\/wp-content\/uploads\/2026\/03\/26q1_blog9a.webp 1280w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>SSML is an XML-based markup language that gives developers granular control over synthesized speech.&nbsp;<\/p>\n\n\n\n<p>Rather than relying solely on an engine&#8217;s default interpretation, SSML tags let you specify exactly how text should be spoken.<\/p>\n\n\n\n<p>Key SSML elements include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Prosody<\/strong>: Controls pitch, rate, and volume<\/li>\n\n\n\n<li><strong>Break<\/strong>: Inserts pauses of specified durations<\/li>\n\n\n\n<li><strong>Emphasis<\/strong>: Adds stress to particular words<\/li>\n\n\n\n<li><strong>Say-as<\/strong>: Dictates how content like dates, numbers, or abbreviations should be pronounced<\/li>\n\n\n\n<li><strong>Phoneme<\/strong>: Provides explicit phonetic pronunciation<\/li>\n\n\n\n<li><strong>Voice<\/strong>: Switches between different voice profiles<\/li>\n<\/ul>\n\n\n\n<div style=\"height:25px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p>As noted by the W3C, the organization maintaining SSML standards:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>&#8220;SSML provides a standard way to control aspects of speech such as pronunciation, volume, pitch, and rate across different synthesis-capable platforms.&#8221; \u2014 <a href=\"https:\/\/www.w3.org\/TR\/speech-synthesis11\/\" target=\"_blank\" rel=\"noreferrer noopener nofollow\">W3C Speech Synthesis Markup Language Specification<\/a><\/p>\n\n\n\n<div style=\"height:25px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n<\/blockquote>\n\n\n\n<h2 class=\"wp-block-heading\">Top APIs with excellent SSML support<\/h2>\n\n\n\n<p>Several major cloud providers have invested heavily in their text-to-speech offerings, each bringing unique strengths to their SSML implementations.<\/p>\n\n\n\n<p>Understanding the nuances between these platforms helps developers make informed decisions based on their specific project requirements.<\/p>\n\n\n\n<p>Below, we examine the leading contenders and break down what makes each platform&#8217;s API SSML support stand out from the competition.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Amazon Polly<\/h3>\n\n\n\n<figure class=\"wp-block-image size-large\"><img data-dominant-color=\"e1ced4\" data-has-transparency=\"false\" style=\"--dominant-color: #e1ced4;\" loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/typecast.ai\/learn\/wp-content\/uploads\/2026\/03\/26q1_blog9b-1024x576.webp\" alt=\"AWS Polly page.\" class=\"wp-image-13030 not-transparent\" srcset=\"https:\/\/typecast.ai\/learn\/wp-content\/uploads\/2026\/03\/26q1_blog9b-1024x576.webp 1024w, https:\/\/typecast.ai\/learn\/wp-content\/uploads\/2026\/03\/26q1_blog9b-300x169.webp 300w, https:\/\/typecast.ai\/learn\/wp-content\/uploads\/2026\/03\/26q1_blog9b-768x432.webp 768w, https:\/\/typecast.ai\/learn\/wp-content\/uploads\/2026\/03\/26q1_blog9b.webp 1280w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>Amazon Polly stands out for its comprehensive speech synthesis API SSML implementation.<\/p>\n\n\n\n<p>The service supports virtually all standard SSML tags plus proprietary extensions for enhanced functionality.<\/p>\n\n\n\n<p>Notable Polly SSML features:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Amazon-specific tags like <code><mark style=\"background-color:rgba(0, 0, 0, 0);color:#188038\" class=\"has-inline-color\"><strong>&lt;amazon:breath&gt;<\/strong><\/mark><\/code> for natural breathing sounds<\/li>\n\n\n\n<li><code><mark style=\"background-color:rgba(0, 0, 0, 0);color:#188038\" class=\"has-inline-color\"><strong>&lt;amazon:auto-breaths&gt;<\/strong><\/mark><\/code> for automatic breath insertion<\/li>\n\n\n\n<li>Neural voice support with SSML compatibility<\/li>\n\n\n\n<li>Whispered speech effects using <code><mark style=\"background-color:rgba(0, 0, 0, 0);color:#188038\" class=\"has-inline-color\"><strong>&lt;amazon:effect name=\"whispered\"&gt;<\/strong><\/mark><\/code><\/li>\n<\/ul>\n\n\n\n<div style=\"height:25px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p>Polly&#8217;s documentation explicitly states support for prosody modifications ranging from x-slow to x-fast for rate and x-soft to x-loud for volume adjustments.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Google Cloud Text-to-Speech<\/h3>\n\n\n\n<figure class=\"wp-block-image size-large\"><img data-dominant-color=\"f6dee2\" data-has-transparency=\"false\" style=\"--dominant-color: #f6dee2;\" loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/typecast.ai\/learn\/wp-content\/uploads\/2026\/03\/26q1_blog9c-1024x576.webp\" alt=\"Google Cloud Text-to-Speech page.\" class=\"wp-image-13031 not-transparent\" srcset=\"https:\/\/typecast.ai\/learn\/wp-content\/uploads\/2026\/03\/26q1_blog9c-1024x576.webp 1024w, https:\/\/typecast.ai\/learn\/wp-content\/uploads\/2026\/03\/26q1_blog9c-300x169.webp 300w, https:\/\/typecast.ai\/learn\/wp-content\/uploads\/2026\/03\/26q1_blog9c-768x432.webp 768w, https:\/\/typecast.ai\/learn\/wp-content\/uploads\/2026\/03\/26q1_blog9c.webp 1280w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>Google&#8217;s offering provides robust API SSML support with extensive tag compatibility. Their WaveNet and Neural2 voices work seamlessly with SSML markup.<\/p>\n\n\n\n<p>Key strengths include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Full prosody control including semitone-level pitch adjustments<\/li>\n\n\n\n<li>Audio profiles optimized for different devices<\/li>\n\n\n\n<li>Support for speaking rate modifications from 0.25x to 4.0x<\/li>\n\n\n\n<li>Comprehensive say-as interpretations for multiple data types<\/li>\n<\/ul>\n\n\n\n<div style=\"height:25px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p>According to Google&#8217;s developer documentation:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>&#8220;SSML gives you more control over how Cloud Text-to-Speech generates audio from your input text.&#8221; \u2014 <a href=\"https:\/\/cloud.google.com\/text-to-speech\/docs\/ssml\" target=\"_blank\" rel=\"noreferrer noopener nofollow\">Google Cloud Text-to-Speech Documentation<\/a><\/p>\n<\/blockquote>\n\n\n\n<div style=\"height:25px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">Microsoft Azure Speech Service<\/h3>\n\n\n\n<figure class=\"wp-block-image size-large\"><img data-dominant-color=\"e5c8d1\" data-has-transparency=\"false\" style=\"--dominant-color: #e5c8d1;\" loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/typecast.ai\/learn\/wp-content\/uploads\/2026\/03\/26q1_blog9d-1024x576.webp\" alt=\"Microsoft Azure page.\" class=\"wp-image-13032 not-transparent\" srcset=\"https:\/\/typecast.ai\/learn\/wp-content\/uploads\/2026\/03\/26q1_blog9d-1024x576.webp 1024w, https:\/\/typecast.ai\/learn\/wp-content\/uploads\/2026\/03\/26q1_blog9d-300x169.webp 300w, https:\/\/typecast.ai\/learn\/wp-content\/uploads\/2026\/03\/26q1_blog9d-768x432.webp 768w, https:\/\/typecast.ai\/learn\/wp-content\/uploads\/2026\/03\/26q1_blog9d.webp 1280w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>Microsoft Azure offers one of the most feature-rich SSML implementations available.<\/p>\n\n\n\n<p>Their Speech Service supports standard SSML plus numerous Microsoft-specific extensions.<\/p>\n\n\n\n<p>Standout capabilities:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code><mark style=\"background-color:rgba(0, 0, 0, 0);color:#188038\" class=\"has-inline-color\"><strong>&lt;mstts:express-as&gt;<\/strong><\/mark><\/code> for emotional speaking styles<\/li>\n\n\n\n<li>Background audio mixing with <code><mark style=\"background-color:rgba(0, 0, 0, 0);color:#188038\" class=\"has-inline-color\"><strong>&lt;mstts:backgroundaudio&gt;<\/strong><\/mark><\/code><\/li>\n\n\n\n<li>Silence insertion with precise millisecond control<\/li>\n\n\n\n<li>Custom neural voice support with full SSML compatibility<\/li>\n<\/ul>\n\n\n\n<div style=\"height:25px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p>Azure&#8217;s platform enables developers to create genuinely expressive speech by combining standard tags with proprietary emotional controls.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">IBM Watson Text to Speech<\/h3>\n\n\n\n<figure class=\"wp-block-image size-large\"><img data-dominant-color=\"523c46\" data-has-transparency=\"false\" style=\"--dominant-color: #523c46;\" loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/typecast.ai\/learn\/wp-content\/uploads\/2026\/03\/26q1_blog9e-1024x576.webp\" alt=\"IBM text-to-speech page.\" class=\"wp-image-13033 not-transparent\" srcset=\"https:\/\/typecast.ai\/learn\/wp-content\/uploads\/2026\/03\/26q1_blog9e-1024x576.webp 1024w, https:\/\/typecast.ai\/learn\/wp-content\/uploads\/2026\/03\/26q1_blog9e-300x169.webp 300w, https:\/\/typecast.ai\/learn\/wp-content\/uploads\/2026\/03\/26q1_blog9e-768x432.webp 768w, https:\/\/typecast.ai\/learn\/wp-content\/uploads\/2026\/03\/26q1_blog9e.webp 1280w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>IBM Watson provides solid SSML support with particular strength in enterprise applications.<\/p>\n\n\n\n<p>Their implementation covers core SSML tags while adding useful extensions.<\/p>\n\n\n\n<p>Watson&#8217;s SSML features include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Transformation element for voice customization<\/li>\n\n\n\n<li>Expression tags for emotional variation<\/li>\n\n\n\n<li>Standard prosody and break controls<\/li>\n\n\n\n<li>Phoneme support using IPA notation<\/li>\n<\/ul>\n\n\n\n<div style=\"height:25px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Non-SSML alternatives worth considering<\/h2>\n\n\n\n<p>While API SSML support remains valuable for many developers, not every project requires manual markup control.&nbsp;<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Typecast API<\/h3>\n\n\n\n<figure class=\"wp-block-image size-large\"><img data-dominant-color=\"f2d0d4\" data-has-transparency=\"false\" style=\"--dominant-color: #f2d0d4;\" loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/typecast.ai\/learn\/wp-content\/uploads\/2026\/03\/26q1_blog9f-1024x576.webp\" alt=\"Typecast text-to-speech API page.\" class=\"wp-image-13034 not-transparent\" srcset=\"https:\/\/typecast.ai\/learn\/wp-content\/uploads\/2026\/03\/26q1_blog9f-1024x576.webp 1024w, https:\/\/typecast.ai\/learn\/wp-content\/uploads\/2026\/03\/26q1_blog9f-300x169.webp 300w, https:\/\/typecast.ai\/learn\/wp-content\/uploads\/2026\/03\/26q1_blog9f-768x432.webp 768w, https:\/\/typecast.ai\/learn\/wp-content\/uploads\/2026\/03\/26q1_blog9f.webp 1280w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>The <a href=\"https:\/\/typecast.ai\/developers\/api\">text-to-speech API<\/a> offering from Typecast offers a compelling alternative approach.<\/p>\n\n\n\n<p>Rather than relying on SSML tags for expressiveness, Typecast leverages advanced AI voice actors that deliver natural emotion and intonation without manual markup.<\/p>\n\n\n\n<p>This approach offers several advantages:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Reduced development complexity<\/li>\n\n\n\n<li>No need to learn SSML syntax<\/li>\n\n\n\n<li>Naturally expressive voices out of the box<\/li>\n\n\n\n<li>Faster implementation for many use cases<\/li>\n<\/ul>\n\n\n\n<div style=\"height:25px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p>For developers prioritizing speed and simplicity over granular control, Typecast provides an excellent option that achieves expressive results through superior underlying voice technology rather than manual tagging.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How to choose the best TTS API for your needs<\/h2>\n\n\n\n<figure class=\"wp-block-image size-large\"><img data-dominant-color=\"628097\" data-has-transparency=\"false\" style=\"--dominant-color: #628097;\" loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/typecast.ai\/learn\/wp-content\/uploads\/2026\/03\/26q1_blog9g-1024x576.webp\" alt=\"A man making a decision.\" class=\"wp-image-13035 not-transparent\" srcset=\"https:\/\/typecast.ai\/learn\/wp-content\/uploads\/2026\/03\/26q1_blog9g-1024x576.webp 1024w, https:\/\/typecast.ai\/learn\/wp-content\/uploads\/2026\/03\/26q1_blog9g-300x169.webp 300w, https:\/\/typecast.ai\/learn\/wp-content\/uploads\/2026\/03\/26q1_blog9g-768x432.webp 768w, https:\/\/typecast.ai\/learn\/wp-content\/uploads\/2026\/03\/26q1_blog9g.webp 1280w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>Selecting the right platform depends on several factors beyond SSML capabilities. Consider these evaluation criteria:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Voice quality and naturalness<\/h3>\n\n\n\n<p>While SSML support in speech APIs provides control, the underlying voice quality matters tremendously. Neural voices from major providers generally outperform concatenative alternatives.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Language and voice variety<\/h3>\n\n\n\n<p>Ensure your chosen platform supports required languages and offers sufficient voice diversity. Some APIs excel in specific language families.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Pricing structure<\/h3>\n\n\n\n<p>Costs vary significantly between providers. Amazon Polly charges per character, while others use different metrics. Calculate expected usage carefully.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Integration complexity<\/h3>\n\n\n\n<p>Evaluate SDK availability, documentation quality, and community support.<\/p>\n\n\n\n<p>A comprehensive text-to-speech API should offer straightforward integration paths.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Common SSML implementation challenges<\/h2>\n\n\n\n<figure class=\"wp-block-image size-large\"><img data-dominant-color=\"e6edf3\" data-has-transparency=\"false\" style=\"--dominant-color: #e6edf3;\" loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/typecast.ai\/learn\/wp-content\/uploads\/2026\/03\/26q1_blog9h-1024x576.webp\" alt=\"A group of people assembling something.\" class=\"wp-image-13036 not-transparent\" srcset=\"https:\/\/typecast.ai\/learn\/wp-content\/uploads\/2026\/03\/26q1_blog9h-1024x576.webp 1024w, https:\/\/typecast.ai\/learn\/wp-content\/uploads\/2026\/03\/26q1_blog9h-300x169.webp 300w, https:\/\/typecast.ai\/learn\/wp-content\/uploads\/2026\/03\/26q1_blog9h-768x432.webp 768w, https:\/\/typecast.ai\/learn\/wp-content\/uploads\/2026\/03\/26q1_blog9h.webp 1280w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>Even with strong API SSML support, developers face certain obstacles:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Inconsistent tag support<\/strong>: Not all engines interpret every tag identically<\/li>\n\n\n\n<li><strong>Voice-specific limitations<\/strong>: Some tags only work with particular voices<\/li>\n\n\n\n<li><strong>Performance considerations<\/strong>: Complex SSML can increase processing time<\/li>\n\n\n\n<li><strong>Testing requirements<\/strong>: Extensive testing ensures consistent output across scenarios<\/li>\n<\/ul>\n\n\n\n<div style=\"height:25px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">Best practices for SSML development<\/h3>\n\n\n\n<p>To maximize your SSML implementation success:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Start with standard tags before exploring proprietary extensions<\/li>\n\n\n\n<li>Test thoroughly across target voices and platforms<\/li>\n\n\n\n<li>Use phoneme tags sparingly for genuinely problematic words<\/li>\n\n\n\n<li>Document your SSML patterns for team consistency<\/li>\n<\/ul>\n\n\n\n<div style=\"height:25px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Conclusion<\/h2>\n\n\n\n<p>The leading cloud providers\u2014Amazon, Google, Microsoft, and IBM\u2014all offer substantial API SSML support for text-to-speech applications.<\/p>\n\n\n\n<p>Amazon Polly and Microsoft Azure currently provide the most extensive proprietary extensions, while Google offers excellent standard compliance with superior neural voice quality.<\/p>\n\n\n\n<p>However, developers should also consider whether SSML is truly necessary for their projects.<\/p>\n\n\n\n<p>Platforms like Typecast demonstrate that expressive, natural speech can be achieved through advanced AI voices without manual markup, potentially simplifying development workflows.<\/p>\n\n\n\n<p>Your choice should balance SSML capabilities with voice naturalness, pricing, and integration requirements.<\/p>\n\n\n\n<p>Whether you select the <a href=\"https:\/\/typecast.ai\/learn\/best-tts-api-what-to-know\/\">best TTS API<\/a> with comprehensive SSML or opt for a naturally expressive alternative, the goal remains the same: creating genuinely engaging voice experiences that captivate users and elevate applications.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>When building voice-enabled applications, API SSML support can make the difference between robotic-sounding audio and natural, expressive speech. Understanding which text-to-speech platforms offer comprehensive SSML capabilities is essential for developers seeking precise control over speech output. Speech Synthesis Markup Language (SSML) allows developers to fine-tune pronunciation, pacing, emphasis, and emotional tone. Without robust SSML support [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":13028,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[33],"tags":[],"class_list":["post-13037","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-developers"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Which Text-to-Speech APIs Offer the Best SSML Support? | Typecast<\/title>\n<meta name=\"description\" content=\"Discover which platforms offer the best API SSML support for text-to-speech development and learn how to choose the right solution.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/typecast.ai\/learn\/best-api-ssml-support\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Which Text-to-Speech APIs Offer the Best SSML Support? 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