{"slug": "offlinetts-vs-amazon-polly-free-local-tts-vs-aws-cloud", "title": "OfflineTTS vs Amazon Polly: Free Local TTS vs AWS Cloud", "summary": "OfflineTTS offers unlimited free, local text-to-speech with 54 voices and no data transmission, while Amazon Polly charges $4 per 1 million characters for 100+ cloud-based voices with full SSML support. OfflineTTS wins on cost and privacy, but Amazon Polly provides more languages, voice options, and API integration.", "body_md": "[← Back to Blog](/blog/)\n\n# OfflineTTS vs Amazon Polly: Free Local TTS vs AWS Cloud\n\n- tts\n- comparison\n- amazon-polly\n- aws\n- free\n\nAmazon Polly is AWS’s cloud-based text-to-speech service, popular for its low per-character pricing and tight integration with AWS services. OfflineTTS takes the opposite approach: zero-cost, browser-based, and fully local.\n\nHere’s how they stack up.\n\n## Quick Comparison\n\n| Feature | OfflineTTS | Amazon Polly |\n|---|---|---|\nPrice | Free | $4/1M chars (Standard + Neural) |\nFree Tier | Unlimited (all features) | 1M chars/mo (first 12 months) |\nVoice Count | 54 + Supertonic/Piper/Kitten | 100+ |\nLanguages | 9 | 30+ |\nVoice Quality | A/A- (Kokoro 82M) | Neural (good), Generative (best) |\nOffline | ✅ After initial model download | ❌ Requires internet |\nPrivacy | ✅ Text never leaves your device | ❌ Text sent to AWS servers |\nSSML | ❌ (plain text) | ✅ Full SSML |\nAPI | ❌ (browser only) | ✅ REST API, AWS SDKs |\nSignup | ❌ None | ✅ AWS account required |\nVoice Cloning | ❌ | ❌ |\nExport | WAV, MP3 | MP3, OGG, PCM |\n\n## Pricing: Truly Free vs $4/1M\n\n**OfflineTTS** generates unlimited speech at zero cost — no free tier expiration, no character limits, no credit card required. It runs on your device after the one-time model download.\n\n**Amazon Polly** charges $4 per 1 million characters for both Standard and Neural voices — much simpler than Google Cloud or Azure’s multi-tier pricing. The free tier gives you 1 million characters per month for the first 12 months.\n\n| Volume | OfflineTTS | Amazon Polly |\n|---|---|---|\n| 100K chars/month | $0 | $0 (free tier) |\n| 1M chars/month | $0 | $0 (free tier) |\n| 5M chars/month | $0 | $20 |\n| 10M chars/month | $0 | $40 |\n| 100M chars/month | $0 (or self-host) | $400 |\n\nAt scale, OfflineTTS stays at zero. Amazon Polly at $4/1M is the cheapest cloud TTS API — Google charges $4–16, Azure $4–16, ElevenLabs $165+. For high-volume production, Polly is the most cost-effective cloud option.\n\n**Winner:** OfflineTTS for cost. Amazon Polly for cheapest cloud API pricing.\n\n## Voice Quality\n\n**Amazon Polly** offers three voice tiers:\n\n**Standard**— concatenative synthesis, noticeably robotic** Neural**— improved naturalness, the most commonly used tier** Generative**— newest, highest quality (launched 2024)\n\n**OfflineTTS** uses Kokoro 82M (A-grade), Piper, and Supertonic. Kokoro’s top voices match or exceed Polly’s Neural tier in naturalness for short-to-medium speech.\n\nWhere Polly excels:\n\n**Consistency**— decades of tuning, very reliable output** SSML control**— full SSML for precise prosody** Generative voices**— new gen-AI voices are competitive with Kokoro\n\nWhere OfflineTTS excels:\n\n**No latency**— instant generation on WebGPU** Cost at volume**— free vs $4/1M adds up** Privacy**— no data transmitted\n\n**Winner:** Tie for quality. Polly has more options; OfflineTTS’s best voices compete well.\n\n## Privacy & Offline\n\n**OfflineTTS** processes everything on your device. Text never reaches a server. English works fully offline after the model download. Non-English uses a lightweight phonemization service before local synthesis.\n\n**Amazon Polly** sends your text to AWS servers. While AWS has strong security certifications, the architecture requires data transmission for every request. No offline mode exists.\n\nFor applications handling sensitive data — legal, medical, financial — OfflineTTS’s local-only processing eliminates the compliance risk of transmitting speech data.\n\n**Winner:** OfflineTTS — on-device processing is fundamentally more private.\n\n## SSML & Speech Marks\n\n**Amazon Polly** supports:\n\n- Full SSML:\n`<break>`\n\n,`<prosody>`\n\n,`<emphasis>`\n\n,`<say-as>`\n\n,`<phoneme>`\n\n,`<sub>`\n\n,`<lang>`\n\n,`<audio>`\n\n,`<p>`\n\n/`<s>`\n\n**Speech Marks**— word-level timing data (word boundaries, sentence boundaries, visemes)** Lexicons**— custom pronunciation dictionaries\n\n**OfflineTTS** accepts plain text only. No SSML. No speech marks. Pacing is controlled through punctuation.\n\n**Winner:** Amazon Polly — SSML and speech marks are essential for production workflows.\n\n## API & Integration\n\n**Amazon Polly** provides:\n\n- REST API and AWS SDKs (Python, Node.js, Java, .NET, Go, etc.)\n**SynthesizeSpeech** and**StartSpeechSynthesisTask**(async batch)- Integration with AWS services (Lambda, S3, CloudFront)\n**Lexicon management** for custom pronunciations\n\n**OfflineTTS** is browser-only with no API. For programmatic TTS, use the [Kokoro Python package](https://github.com/hexgrad/kokoro) directly.\n\n**Winner:** Amazon Polly for API integration. Kokoro Python for local scripting.\n\n## Use Cases\n\n### YouTube and Content Creation\n\nOfflineTTS wins on cost. Unlimited free generation means you can iterate endlessly. Polly is more cost-effective than other cloud APIs if you need SSML.\n\n### Audiobooks\n\nAmazon Polly’s SSML and Speech Marks are useful for audiobook production. At $4/1M chars, a 100K-word novel costs about $2.40 — very affordable. OfflineTTS is free but has no SSML.\n\n### E-Learning\n\nPolly’s SSML gives fine-grained control over instructional narration. OfflineTTS’s privacy matters for courses with sensitive content.\n\n### Enterprise Applications\n\nAmazon Polly’s AWS integration and reliability make it the standard choice for enterprise TTS in the AWS ecosystem. OfflineTTS doesn’t support programmatic integration.\n\n## The Bottom Line\n\n**Choose OfflineTTS if you:**\n\n- Want truly unlimited free TTS\n- Need privacy — text stays on your device\n- Need offline capability\n- Don’t need SSML or API access\n- Produce short-to-medium form content\n\n**Choose Amazon Polly if you:**\n\n- Need the cheapest cloud-based TTS API ($4/1M)\n- Require SSML for precise prosody control\n- Need Speech Marks for word-level timing\n- Are building an application in the AWS ecosystem\n- Need custom pronunciation lexicons\n\n**Winner for most users:** OfflineTTS for personal use. Amazon Polly for AWS-native production.\n\n## Related articles\n\n## Try OfflineTTS\n\nFour local TTS engines, Whisper transcription, and private browser audio tools.\n\n[Open TTS Tool](/app/)", "url": "https://wpnews.pro/news/offlinetts-vs-amazon-polly-free-local-tts-vs-aws-cloud", "canonical_source": "https://offlinetts.com/blog/offlinetts-vs-amazon-polly/", "published_at": "2026-07-24 00:00:00+00:00", "updated_at": "2026-07-25 01:39:00.531162+00:00", "lang": "en", "topics": ["artificial-intelligence", "ai-products", "ai-tools", "ai-infrastructure"], "entities": ["OfflineTTS", "Amazon Polly", "AWS", "Kokoro 82M", "Piper", "Supertonic", "ElevenLabs"], "alternates": {"html": "https://wpnews.pro/news/offlinetts-vs-amazon-polly-free-local-tts-vs-aws-cloud", "markdown": "https://wpnews.pro/news/offlinetts-vs-amazon-polly-free-local-tts-vs-aws-cloud.md", "text": "https://wpnews.pro/news/offlinetts-vs-amazon-polly-free-local-tts-vs-aws-cloud.txt", "jsonld": "https://wpnews.pro/news/offlinetts-vs-amazon-polly-free-local-tts-vs-aws-cloud.jsonld"}}