I'm building a voice app and need speech-to-text and text-to-speech APIs

Sure — for a voice app, you’ll typically want:

1. Speech-to-Text (STT): convert user audio to text
2. Text-to-Speech (TTS): convert generated text back to audio

Good API options

1) OpenAI

• STT: Whisper / audio transcription models
• TTS: text-to-speech models with natural voices
• Good if you want simple integration and strong quality

2) Google Cloud

• STT: Google Speech-to-Text
• TTS: Google Text-to-Speech
• Good for enterprise scale and many languages

3) AWS

• STT: Amazon Transcribe
• TTS: Amazon Polly
• Good if you’re already on AWS

4) Microsoft Azure

• STT: Azure Speech to Text
• TTS: Azure Neural TTS
• Good multilingual support and enterprise features

5) Deepgram / AssemblyAI / Speechmatics

• Strong STT-focused platforms
• Useful if you need low latency or streaming transcription

Typical voice app flow

1. User speaks into microphone
2. Send audio to STT API
3. Receive transcript
4. Process transcript with your app/LLM
5. Send response text to TTS API
6. Play returned audio

What to choose

• Want easiest all-in-one setup? OpenAI
• Need highly scalable cloud infrastructure? Google/AWS/Azure
• Need best real-time transcription? Deepgram or AssemblyAI
• Need natural voice quality? Azure or OpenAI TTS

Quick implementation note

If you want, I can give you:

• a side-by-side comparison table
• recommended APIs by use case
• or sample code for Python / Node.js / React Native / Flutter

If you tell me your platform and whether you need real-time streaming, I can suggest the best stack.