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Voice App Development Tools

89 tools found

Showing 31โ€“60 of 89 tools

Faster Whisper
Open source Open Source

Optimised Whisper implementation for faster speech transcription.

Deepgram
Freemium

Real-time speech recognition API with custom model training support.

โœ“ Free trial available
AssemblyAI
Freemium

Speech AI API with transcription, LeMUR, and audio intelligence features.

โœ“ Free trial available
Speechmatics
Freemium

AI-powered speech recognition with 50+ languages and real-time streaming.

โœ“ Free trial available
Rev AI
Freemium

Speech recognition API with human-in-the-loop accuracy options.

โœ“ Free trial available
Gladia
Freemium

Speech-to-text API with translation and audio intelligence capabilities.

โœ“ Free trial available
PyAudio
Open source Open Source

Python bindings for PortAudio for audio I/O in voice applications.

SpeechRecognition
Open source Open Source

Python library for speech recognition with multiple engine backends.

pyttsx3
Open source Open Source

Python text-to-speech conversion library working offline.

Microsoft Speech SDK
Paid

SDK for adding speech capabilities to apps on any platform.

โœ“ Free trial available
Porcupine
Freemium

On-device wake word detection engine for privacy-preserving voice apps.

โœ“ Free trial available
Picovoice
Freemium

End-to-end on-device voice AI platform with privacy-first processing.

โœ“ Free trial available
openWakeWord
Open source Open Source

Open-source wake word detection using audio embeddings.

Silero Models
Open source Open Source

Pre-trained speech models for STT, TTS, and VAD in multiple languages.

NVIDIA NeMo
Open source Open Source

Toolkit for building conversational AI with speech and NLP models.

Kaldi
Open source Open Source

Speech recognition toolkit widely used in research and production.

Coqui STT
Open source Open Source

Open-source speech-to-text engine based on DeepSpeech architecture.

Vosk
Open source Open Source

Offline speech recognition toolkit for 20+ languages with small footprint.

eSpeak NG
Open source Open Source

Open-source speech synthesiser with support for 100+ languages.

Festival
Open source Open Source

General multi-lingual speech synthesis system from University of Edinburgh.

Bot Framework SDK
Open source Open Source

Microsoft open-source SDK for building conversational voice chatbots.

โœ“ Free trial available
LangChain Voice
Open source Open Source

Framework for chaining LLMs with speech models for voice applications.

Retell AI
Freemium

API for building human-like voice AI agents for phone and web.

โœ“ Free trial available
Bland AI
Freemium

Programmable AI phone agents for automated voice calls at scale.

โœ“ Free trial available
Vapi
Freemium

Voice AI infrastructure for building real-time voice assistants.

โœ“ Free trial available
Hamming
Freemium

Platform for building and testing AI voice agents for customer service.

โœ“ Free trial available
Vocode
Open source Open Source

Open-source library for building voice bots and real-time audio agents.

โœ“ Free trial available
Pipecat
Open source Open Source

Open-source framework for voice and multimodal conversational AI agents.

LiveKit
Open source Open Source

Open-source WebRTC infrastructure for real-time voice and video agents.

โœ“ Free trial available
Twilio Voice
Paid

Programmable voice API for adding phone calling to any application.

โœ“ Free trial available
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