Compare STT vs TTS and see what are their differences.


🐸STT - The deep learning toolkit for Speech-to-Text. Training and deploying STT models has never been so easy. (by coqui-ai)


:robot: :speech_balloon: Deep learning for Text to Speech (Discussion forum: (by mozilla)
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11 62
2,161 8,895
2.7% 2.0%
0.6 0.0
3 months ago 7 months ago
C++ Jupyter Notebook
Mozilla Public License 2.0 Mozilla Public License 2.0
The number of mentions indicates the total number of mentions that we've tracked plus the number of user suggested alternatives.
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.


Posts with mentions or reviews of STT. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2023-05-04.


Posts with mentions or reviews of TTS. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2024-01-04.
  • Any recommendation for human like voice AI model for conversation AI?
    2 projects | | 4 Jan 2024
    Fast or good, choose one

    Mozilla's TTS is a python package installable with pip and uses cpu or gpu resources to render a choice of voices, they mostly sound natural and this is the good.

    Mycroft's mimic3 is the default voice renderer for the Mycroft project that runs on pi hardware and sounds ok-ish, that is the fast.

    There are many others but these are the two I use according to if it needs to run on limited hardware or if the cycles fall freely from the sky.

  • Is Shutting Down
    4 projects | | 3 Jan 2024
    Coqui-ai was a commercial continuation of Mozilla TTS and STT (

    At the time (2018-ish), it was really impressive for on-device voice synthesis (with a quality approaching the Google and Azure cloud-based voice synthesis options) and open source, so a lot of people in the FOSS community were hoping it could be used for a privacy-respecting home assistant, Linux speech synthesis that doesn't suck, etc.

    After Mozilla abandoned the project, Coqui continued development and had some really impressive one-shot voice cloning, but pivoted to marketing speech synthesis for game developers. They were probably having trouble monetizing it, and it doesn't surprise me that they shut down.

    An equivalent project that's still in active development and doing really well is Piper TTS (

  • What self hosted app do you wish existed?
    17 projects | /r/selfhosted | 18 Jun 2023
    An RSS reader that integrates TTS (or TTS)
  • Audio Converter! How to write one in c/c++?
    1 project | /r/AskProgramming | 14 May 2023
    My solution would be to use a speech synthesis library, maybe eSpeak or Festival, just for ease of use; I think they each provide a library that you could use from C or C++ easily. This one from Mozilla is a more modern system with better-quality output, but it looks like it's set up to run through Python, and I haven't looked at it closely enough to see how much work it would be to get it working for you.
  • Web Speech API is (still) broken on Linux circa 2023
    8 projects | /r/javascript | 15 Apr 2023
    There is a lot of TTS and SST development going on (;; That is the only way they work: Contributions from the wild.
  • [P] Balacoon: free-to-use text-to-speech
    3 projects | /r/MachineLearning | 13 Apr 2023
    unfortunately not yet. I need to expand the library of languages and voices. looking around, it seems only Coqui had some traction re Brazilian Portuguese: If you foresee wide adoption of the tech for this locale, hit me up with DM
  • Text to speech free
    1 project | /r/software | 9 Apr 2023
    I haven't used it, but there's also mozilla/TTS.
  • Does anyone know how to set up Mozilla TTS to work with firefox's reader view?
    1 project | /r/firefox | 31 Mar 2023
    Mozilla TTS
  • Conteúdo removido do rb que fiz sobre a destruição do Rio Doce 853KM de rio pela Vale e BHP Billings
    1 project | /r/brasilivre | 25 Mar 2023
  • [D] Looking for someone to do a small coding job
    2 projects | /r/MachineLearning | 25 Feb 2023
    Instead, just use Firefox's open-source TTS model:

What are some alternatives?

When comparing STT and TTS you can also consider the following projects:

DeepSpeech - DeepSpeech is an open source embedded (offline, on-device) speech-to-text engine which can run in real time on devices ranging from a Raspberry Pi 4 to high power GPU servers.

Real-Time-Voice-Cloning - Clone a voice in 5 seconds to generate arbitrary speech in real-time

TTS - 🐸💬 - a deep learning toolkit for Text-to-Speech, battle-tested in research and production

TensorFlowTTS - :stuck_out_tongue_closed_eyes: TensorFlowTTS: Real-Time State-of-the-art Speech Synthesis for Tensorflow 2 (supported including English, French, Korean, Chinese, German and Easy to adapt for other languages)

NeMo - A scalable generative AI framework built for researchers and developers working on Large Language Models, Multimodal, and Speech AI (Automatic Speech Recognition and Text-to-Speech)

vosk-api - Offline speech recognition API for Android, iOS, Raspberry Pi and servers with Python, Java, C# and Node

OBS-captions-plugin - Closed Captioning OBS plugin using Google Speech Recognition

flashlight - A C++ standalone library for machine learning

PaddleSpeech - Easy-to-use Speech Toolkit including Self-Supervised Learning model, SOTA/Streaming ASR with punctuation, Streaming TTS with text frontend, Speaker Verification System, End-to-End Speech Translation and Keyword Spotting. Won NAACL2022 Best Demo Award.