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Open Source Speech-to-text

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Best Free Speech-To-Text APIs and Open Source Libraries
  • Braina Dictate into third party software and websites, fill web forms and execute vocal commands.
  • Dragon NaturallySpeaking from Nuance Communications Successor to the older DragonDictate product. Focus on dictation. 64-bit Windows support since version 10.1.
  • SpeechMagic Nuance Communications acquired Philips owned. Medical industry focus according to Frost & Sullivan. Standalone or embedded.
  • Tazti Create speech command profiles to play PC games and control applications programs. Create speech commands to open files, folders, webpages, applications. Windows 7, Windows 8 and Windows 8.1 versions.
  • Voice Finger software that improves the Windows speech recognition system by adding several extensions to it. The software enables controlling the mouse and the keyboard by only using the voice. It is especially useful for aiding users to overcome disabilities or to heal from computer injuries.

English Voice Typing Keyboard

English Voice Typing Keyboard Voice to Text Converter as it instantly converts spoken words to text format with high accuracy.

With the advancement in technology and the rapid growth of the world English Voice Typing keyboard Voice to Text will facilitate your life. Voice to text apps can be a treat for busy professionals who dont even find time to have a conversation with their loved ones. Voice typing is actually a speech recognition tool that records, analyzes and interprets the phrases and words you speak and converts your voice into words much faster than it would take you to type. This feature is useful for visually impaired people to take notes and convey their messages in the easiest way. Voice typing in English will increase your confidence in speaking English in such a way that if you do not understand any phrase, word or sentence, it will confirm it and give alternative suggestions. With each update, app developers try to innovate new core features.In addition to voice typing, it also has built-in aesthetic wallpapers, funky stickers and cute emojis that will blow your mind. The application is very convenient to use while dealing with clients who do not speak the same language as you or useful for those who have moved abroad for study or business purpose. Speechnotes is exemplary for codifying long notes, is a delight for the students to take notes and will save them in chats for later.

Price: Free

Use Mozilla Deepspeech To Enable Speech To Text In Your Application

Pixabay. Modified by Opensource.com. CC BY-SA 4.0.

One of the primary functions of computers is to parse data. Some data is easier to parse than other data, and voice input continues to be a work in progress. There have been many improvements in the area in recent years, though, and one of them is in the form of DeepSpeech, a project by Mozilla, the foundation that maintains the Firefox web browser. DeepSpeech is a voice-to-text command and library, making it useful for users who need to transform voice input into text and developers who want to provide voice input for their applications.

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Compatibility & System Requirements

Speechnotes is really a broad-platform app. As long as you run it through a Chrome browser it will work. No need for installation, disk space or high-end machines. It will run smoothly on your PC, desktop, laptop and Chromebook. You might try it on your tablets and phones, but it might have issues with some devices.

Mobile Devices And Smartphones

8 Best Free Open Source Text to Speech Software for Windows

Many mobile phone handsets, including feature phones and smartphones such as iPhones and BlackBerrys, have basic dial-by-voice features built in. Many third-party apps have implemented natural-language speech recognition support, including:

Application name
Assistant for Android, iOS and Windows Phone No

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What Is Speech To Text

Speech to text is a speech recognition software that enables the recognition and translation of spoken language into text through computational linguistics. It is also known as speech recognition or computer speech recognition. Specific applications, tools, and devices can transcribe audio streams in real-time to display text and act on it.

Microsoft Azure Speech To Text

Microsoft Azure speech to text is cloud-based software that is a part of Azures platform for cognitive services.

The software allows real-time transcription, as well as transcription of saved video and audio files. The app also has functions that can cater to accents, speech patterns, and even background noise.

Microsoft Azure is highly customizable and offers settings that can adjust to specialist terminology, product and place names, and technical information.


  • The app can cater to multiple speakers at one time and can distinguish between their voices
  • It offers customization for proper nouns
  • It is highly accurate and reliable


  • The software is complicated to set up and the process can be take a lot of time
  • It does not offer a wide range of language translations


The standard cost pricing for Microsoft Azure Speech to Text software is 1600 USD for 2000 hours, with 0.80 USD per hour.

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What Are The Limitations Of Speech To Text

New technologies like speech to text don’t come without imperfection, and these are some of the main limitations of speech to text:

  • It isn’t perfect: While dictation technology is a powerful tool, it is still in its early days,which means there are some gaps in its overall performance. Because it produces verbatim text only, you can end up with an inaccurate or awkward transcript or missing specific quotations.
  • Requires human input: Because speech to text lacks complete accuracy, some human edits to the speech data are required for optimal usage.
  • Requires clean recordings: To get a quality transcript from voice recognition software, you need to ensure the recorded audio is clear and intelligible. This means there needs to be no background noise, adequate pronunciation, no accents, and one person speaking at a time. You also need to provide voice commands for punctuation.

Comprehensive Privacy And Security

Mycroft’s Mimic 3: A privacy-focused open-source neural Text to Speech (TTS) engine
  • Speech service, part of Azure Cognitive Services, is certified by SOC, FedRAMP, PCI DSS, HIPAA, HITECH, and ISO.
  • Your data remains yours. Your audio input and transcription data aren’t logged during audio processing.
  • View and delete your custom speech data and models at any time. Your data is encrypted while it’s in storage.
  • Backed by Azure infrastructure, Speech service offers enterprise-grade security, availability, compliance, and manageability.

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What Is Dictation Software

As you search online for dictation software, keep in mind that it can include all different types of apps and services. The terms dictation software, speech-to-text, voice recognition, voice-to-text, and speech recognition can all mean a program that converts your voice to text on a screen in real-time. But sometimes lumped into a search for these terms are products that provide something else entirely.

For example, some products will transcribe audio files to text, but they do not transcribe your voice to text in real-time. Others market themselves as personal AI assistants and may include a dictation component. And you may run across companies that provide transcription servicesusing humans to transcribe your voice files to text.

Then there are those AI assistants built into many of the devices we use each day: Apple’s Siri, Amazon’s Alexa, and Microsoft’s Cortana. These are fine for scheduling meetings, playing music, and finding a place to eat, but they aren’t designed to transcribe your articles, meetings, and other documents.

For this review, we’ve focused on software, whether standalone or embedded in a device, meant for transcribing speech to text.

But as the technology has improved over the last 20 years and costs have come down, dictation software is now as a tool to increase productivity almost instantly. Look no further than the changed working environment in the wake of COVID-19: more working from home means more opportunity to do things like dictate emails.

How We Tested Dictation Apps

For determining accuracy fairly, I used the same 207-word script for all tests. It has a variety of sentence lengths, multiple paragraphs, proper names, and a few numbers. And as mentioned, I used a mid-priced headset as a microphone for all but the mobile apps. My testing space had very little background noise.

In the initial evaluation of 12 apps, I dictated the script one time while using basic punctuation commands, noted accuracy as a percent of words missed or mistranscribed, and recorded my thoughts on ease of use and versatility. Once I narrowed the final list down, I retested each app with the same script, recorded accuracy, and tried out other features such as file sharing and using the same software in multiple places .

Keep in mind that many of these apps will become more accurate the more times you use them, so the accuracy numbers mentioned will likely improve with continued use. Also, because I was reading from a “script,” my speech tempo was likely faster than the average person who is dictating their thoughts.

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My Favorite Open Source Text To Speech Software For Windows:

Central Access Reader is one of my favorite software as it provides a useful set of features and even lets you export speech to an MP3 file.

You can also try eSpeak which is a simple yet effective open source text to speech converter.

is also nice as it provides some unique audio effects to listen to the text.

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Prosodics And Emotional Content

Open Source Text To Speech Software For Windows

A study in the journal Speech Communication by Amy Drahota and colleagues at the University of Portsmouth, UK, reported that listeners to voice recordings could determine, at better than chance levels, whether or not the speaker was smiling. It was suggested that identification of the vocal features that signal emotional content may be used to help make synthesized speech sound more natural. One of the related issues is modification of the pitch contour of the sentence, depending upon whether it is an affirmative, interrogative or exclamatory sentence. One of the techniques for pitch modification uses discrete cosine transform in the source domain . Such pitch synchronous pitch modification techniques need a priori pitch marking of the synthesis speech database using techniques such as epoch extraction using dynamic plosion index applied on the integrated linear prediction residual of the voiced regions of speech.

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What Are Some Of The Best Open

Open-Source speech recognition software is an excellent approach for enterprises on a tight budget. This also helps them to test ASR technology in their products. Many of these tools provide highly accurate solutions. They allow you to learn how ASR characteristics can help boost the number of clients you reach.

Our blog will provide an overview of the top free speech recognition systems. Now lets get started.

What Is The Best Open Source Speech Recognition System

If you are building a small application which you want to be portable everywhere, then Vosk is your best option, as it is written in Python and works on iOS, android and Raspberry pi too, and supports up to 10 languages. It also provides a huge training dataset if you shall need it, and a smaller one for portable applications.

If, however, you want to train and build your own models for much complex tasks, then any of Fairseq, OpenSeq2Seq, Athena and ESPnet should be more than enough for your needs, and they are the most modern state-of-the-art toolkits.

As for Mozillas DeepSpeech, it lacks a lot of features behind its other competitors in this list, and isnt really cited a lot in speech recognition academic research like the others. And its future is concerning after the recent Mozilla restructure, so one would want to stay away from it for now.

Traditionally, are also very much cited in the academic literature.

Alternatively, you may try these open source speech recognition libraries to see how they work for you in your use case.

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What Are The Types Of Speech To Text Technology

There are two main types of speech to text technology:

  • Speaker-dependent: Mainly used for dictation software.
  • Speaker-independent: Often used for phone applications.
  • These two speech recognition systems rely on software and services to function adequately, with the main type being built-in dictation technology. Many devices now have built-in dictation tools, such as laptops, smartphones, and tablets

    Python: Convert Speech To Text And Text To Speech

    Speech To Text with DeepSpeech (Python Package)

    Speech Recognition is an important feature in several applications used such as home automation, artificial intelligence, etc. This article aims to provide an introduction on how to make use of the SpeechRecognition and pyttsx3 library of Python.Installation required:

    • PyAudio: Use the following command for linux users
    • Windows users can install pyaudio by executing the following command in a terminal

    Speech Input Using a Microphone and Translation of Speech to Text

    • Allow Adjusting for Ambient Noise: Since the surrounding noise varies, we must allow the program a second or too to adjust the energy threshold of recording so it is adjusted according to the external noise level.
    • Speech to text translation: This is done with the help of Google Speech Recognition. This requires an active internet connection to work. However, there are certain offline Recognition systems such as PocketSphinx, but have a very rigorous installation process that requires several dependencies. Google Speech Recognition is one of the easiest to use.

    Translation of Speech to Text:First, we need to import the library and then initialize it using init function. This function may take 2 arguments.

    • drivername: sapi5 on Windows | nsss on MacOS
    • debug: to enable or disable debug output

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    Is Voice Dictation For You

    While not perfect, the accuracy of most dictation software is excellent. That and the already free versions packaged with so many devices and apps make using the technologyat least for quicker tasks like note takingan easy decision.

    If you spend a lot of time writing for work or even fun, it makes sense to try dictation just to get the feel of speaking the words that normally come through your fingers. This may be the hardest part for many usersold habits die hard. Once you get used to dictating your thoughts, you may find it hard to go back to typing.

    This article was originally published in April 2016. Previous versions had contributions from Emily Esposito and Jill Duffy.

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    Microsoft Bing Speech Api

    This Microsoft API is used for transcription purposes of the speech into text of any kind of audio streams that are fed to it. What this application does it, that it either displays whatever the transcribed text is, or it can follow and act upon the command given in the speech. It is best used in scenarios requiring conversion, dictation or an interactive participation, and gives great recognition results.

    There are two important features to it: the REST APIs, where developers can use calls, HTTP format and use the service. Or else, there are Client Libraries also available for downloading, that belong to various platforms such as Windows, iOS, Android, etc. for any kind of integration.

    It has great accuracy, is highly easy to use, and not very expensive, with a free trial version also available to check it before making a minimal purchase. One of its major advantages is that it supports multiple languages, for example, about 5 languages in conversation mode and 15 languages when it comes into dictation mode, so multilingual transcription is also possible.

    Though, it gives the most accurate results when used in a continuous and real-time form, and may be slower in transcribing than other software.

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    A Free Alternative To Dragon Naturally Speaking

    Speechnotes is completely free & comparable in its accuracy to Dragon Natuarlly Speaking. Many of you told us that in some ways, it even outperforms Dragon.We should mention though, that Speechnotes is an alternative to Dragon for dictation purposes only, not for voice controlling other software and not for voice-typing within other software. Dragon has these additional capabilities.If you need to dictate an article though, you will find Speechnotes not only cheaper, but perhaps even better for you.

    Tips For Using Voice Recognition Software

    Open source text to speech extension for Google Chrome

    Though dictation software is pretty good at recognizing different voices, it’s not perfect. Here are some tips to make it work as best as possible.

  • Speak naturally . Dictation apps learn your voice and speech patterns over time. And if you’re going to spend any time with them, you want to be comfortable. Speak naturally. If you’re not getting 90% accuracy initially, try enunciating more.

  • Punctuate. When you dictate, you have to say each period, comma, question mark, and so forth. The software isn’t smart enough to figure it out on its own.

  • Learn a few commands. Take the time to learn a few simple commands, such as “new line” to enter a line break. There are different commands for composing, editing, and operating your device. Commands may differ from app to app, so learn the ones that apply to the tool you choose.

  • Know your limits. Especially on mobile devices, some tools have a time limit for how long they can listensometimes for as little as 10 seconds. Glance at the screen from time to time to make sure you haven’t blown past the mark.

  • Practice. It takes time to adjust to voice recognition software, but it gets easier the more you practice. Some of the more sophisticated apps invite you to train by reading passages or doing other short drills. Don’t shy away from tutorials, help menus, and on-screen cheat sheets.

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