Kaldi
github.com/kaldi-asr/kaldiKaldi provides an open toolkit for speech recognition and speech processing research.
Looking for something like Vosk? Here are 24 alternatives, ranked by how closely they match it on purpose, features and platforms. Of these, 15 are open source.
Vosk provides an offline speech recognition API for mobile devices and servers, with several programming language interfaces.
| # | Alternative | Pricing | Open source | Platforms |
|---|---|---|---|---|
| 1 | Kaldi | — | Not stated | Linux, Windows |
| 2 | whisper.cpp | — | Yes | — |
| 3 | EspNet | — | Yes | — |
| 4 | whisper-ctranslate2 | — | Yes | — |
| 5 | wav2letter | — | Not stated | — |
| 6 | Offer Bull | — | Not stated | Android, iOS, Web |
| 7 | Superwhisper | — | Not stated | Android, iOS, macOS |
| 8 | Parakeet | — | Not stated | Web |
| 9 | Tunisian Speech Recognition | — | Not stated | Web |
| 10 | Kokoro | — | Yes | — |
Kaldi provides an open toolkit for speech recognition and speech processing research.
The whisper.cpp project ports OpenAI’s Whisper speech recognition model to C and C++.
ESPnet includes tools for end to end speech processing and related speech tasks.
The whisper-ctranslate2 command-line client works with the OpenAI Whisper client and uses CTranslate2.
The wav2letter project provides an automatic speech recognition toolkit from Facebook AI Research.
Offer Bull provides AI interview practice, real-time speech recognition, and live answer suggestions for job seekers preparing for online interviews.
Superwhisper turns speech into polished text for use in apps such as Slack and Gmail, with recognition options listed for four operating systems.
NeMo Parakeet ASR Models attain strong speech recognition accuracy while being efficient for inference. Available in CTC and RNN-Transducer variants.
This app transcribes spoken Tunisian Arabic into text using Arabic characters.
Kokoro provides an inference library for its open-weight 82-million-parameter text-to-speech model.
Tortoise is a multi-voice text-to-speech system trained with an emphasis on quality.
The KittenTTS project offers a text-to-speech model described as under 25 MB in size.
EmotiVoice provides a multi-voice text-to-speech engine with prompt controls.
The Chatterbox project provides an open-source text-to-speech system for speech generation.
MMAudio synthesizes audio from video and text through a multimodal joint-training approach presented at CVPR 2025.
insanely-fast-whisper accelerates Whisper transcription using Transformers, Optimum, and flash attention.
Audio-WebUI provides a web interface for different neural networks related to audio.
Audiblez creates audiobook files from EPUB e-books and offers a graphical interface.
Generate audio from text prompts with Bark, a model for text-prompted audio creation.
RVC WebUI is a framework for training voice conversion models with short voice recordings.
Inworld provides real-time text-to-speech, speech-to-text, and language model inference through modular APIs.
Picovoice offers on-device AI SDKs for voice, language, and vision, including speech-to-text, wake-word, and translation tools.
Applio provides free open source voice conversion, custom voice model training, and real time conversion.
ai-coustics enhances speech audio in real time to improve input quality for voice recognition systems.
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