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Production-ready Speech-to-Text API for real-world voice products

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March 1, 2023

Gladia

France Gladia Transcription

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API

Production-ready Speech-to-Text API for real-world voice products

API Async Transcription Speech To Text Real Time Transcription Voice Recognition Audio Processing

Overview

Overview Releases Alternatives Pricing Pros & Cons Prompts Reviews Q&A

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Overview Discussion

316 www.gladia.io

Overview

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Gladia is a speech-to-text platform built for production, turning raw audio into structured outputs that power real workflows like meeting summaries, CRM enrichment, contact center QA, and real-time voice assistants.

With support for 99+ languages and the ability to handle messy real-world audio—overlapping speakers, accents, code-switching, domain-specific terminology—Gladia is designed for the complexity of actual conversations, not clean studio recordings.

Supported features

Key Features

Real-time And Async Transcription
Named Entity Recognition
Multi-lingual Support (99+ Languages)
Speaker Diarization
Code-switching
Custom Vocabulary
Multi-region Support

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Initial release

January 26, 2022

Initial release of Gladia.

Author

Cecilia Caron

@cecilia-caron

Company

Gladia

🇫🇷 France

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Joined: August 2025

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Transcription Gladia

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Pros and Cons

Pros

Real-time and Async transcription

Production-grade accuracy

Strong multilingual support & code-switching

Low Word Error Rate

Low-latency real-time transcription

Scalability: handles large data volumes

Developer experience: plug-and-play, documentation, integrations

High privacy and compliance standards

All-inclusive pricing (no add-ons or hidden fees)

View 4 more pros

Cons

Newer entrant

Onboarding call for custom pricing

No offline functionality mentioned

Single functionality (speech-to-text)

Limited customizability

Q&A

What are the key features of Gladia’s audio transcription API?

wrote:

On top of supporting 100+ languages across both highly accurate asynchronous and real-time transcription, at <300 milliseconds latency, Gladia also offers a layer of add-ons. These range from custom vocabulary, diarization and sentiment analysis to named entity recognition, word-level timestamps, summarization and more.

What languages does Gladia’s speech-to-text API support?

wrote:

Gladia’s Speech-to-Text API supports 100+ languages and accents: afrikaans, albanian, amharic, arabic, armenian, assamese, azerbaijani, bashkir, basque, belarusian, bengali, bosnian, breton, bulgarian, burmese, castilian, catalan, chinese, croatian, czech, danish, dutch, english, estonian, faroese, finnish, flemish, french, galician, georgian, german, greek, gujarati, haitian, haitian creole, hausa, hawaiian, hebrew, hindi, hungarian, icelandic, indonesian, italian, japanese, javanese, kannada, kazakh, khmer, korean, lao, latin, latvian, letzeburgesch, lingala, lithuanian, luxembourgish, macedonian, malagasy, malay, malayalam, maltese, maori, marathi, moldavian, moldovan, mongolian, myanmar, nepali, norwegian, nynorsk, occitan, panjabi, pashto, persian, polish, portuguese, punjabi, pushto, romanian, russian, sanskrit, serbian, shona, sindhi, sinhala, sinhalese, slovak, slovenian, somali, spanish, sundanese, swahili, swedish, tagalog, tajik, tamil, tatar, telugu, thai, tibetan, turkish, turkmen, ukrainian, urdu, uzbek, valencian, vietnamese, welsh, yiddish, yoru.

How can I get started with implementing Gladia’s API in my product?

wrote:

Gladia’s API is extremely easy to implement. To get started, sign up at app.gladia.io. You can choose between trying our product in the playground environment or click ‘Home’ and ‘Generate new API key’ straight away. You can find all the information you need in our developer’s documentation.

How does Gladia’s Speech-to-Text API work?

wrote:

Gladia’s audio transcription API - also called a Speech-to-Text API - allows developers and product owners to add both asynchronous and real-time transcription, as well as a selection of audio intelligence add-ons, to their products by calling on a single API for every audio transcription need. You can find all the information you need in our developer’s documentation. Gladia’s pricing has three tiers: free access, Pay-as-you-Go, and Enterprise. You can find more information on the Pricing page. Gladia’s single API is compatible with all existing tech stacks and telephony protocols, including SIP, VoIP, FreeSwitch and Asterisk.

Do you offer support for multiple programming languages?

wrote:

Absolutely! Our API is designed to be language-agnostic, meaning you can use it with any programming language that can make HTTP requests. We provide code examples in multiple languages to assist developers in integrating our speech-to-text API.

What audio formats does Gladia support?

wrote:

Gladia’s audio transcription API supports a wide range of audio formats and codecs, from WAV and m4a to flac and aac. The full list is available in our documentation under "Supported files & duration," but make sure to reach out to our team if you encounter any issues with your specific file format.

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What type of companies use Gladia’s audio transcription API?

wrote:

Any company that manages or produces audio or video data can benefit from Gladia’s Speech-to-Text technology. Among others, we work with: Virtual meeting providers, note-takers and collaboration platforms use audio transcription to help their customers store and exploit vast amounts of meeting data, giving them access to a previously untapped source of internal knowledge. Contact centers, technology providers, sales enablement- and CRM enrichment platforms improve their performance with real-time transcription, detailed analytics and insights, as well as AI voice companies using STT and TTS APIs in their services and selling to businesses that require enhanced communication capabilities. Audio, video, and media production companies like streaming platforms, screencast or podcast production software, media platforms and forums, and audio and video recording or sharing products all use audio and video transcription. Both to make their content exponentially faster to catalog, access and search for, as well as to generate captions and subtitles. Specialized companies in industries such as medicine, law and finance find great value in speech-to-text technology that is fine-tuned to their specific language.

Is Gladia secure?

wrote:

At Gladia, we are used to working with organizations with highly sensitive data and extremely tight security requirements. By default, we deliver our audio transcription services in a cloud-hosted environment which can be customized to your geographical footprint. We are able to deliver on-premises hosting, as well as air-gapped hosting, depending on your security requirements. As Gladia already operates in Europe with organizations that require airtight data privacy compliance, Gladia is able to offer GDPR-compliant audio transcription.

Does Gladia offer documentation and tutorials for users?

wrote:

Yes, Gladia does offer ample documentation and tutorials for users. These resources are designed to assist users in understanding and utilizing Gladia's APIs effectively.

How does Gladia help me extract value from my data?

wrote:

Gladia helps you extract value from your data through its sophisticated AI models. Whether it's audio, text, or visual data, Gladia's tools allow you to process and analyze this data in real time, making it actionable and easy to understand. This can lead to enhanced decision-making, improved customer service, or any other application where data insights are vital.

Why should I choose Gladia over other AI platforms?

wrote:

Choosing Gladia over other AI platforms could be beneficial due to several reasons. Gladia's toolset is highly advanced and is tailored to help you extract maximum value from your data. The accuracy and speed of their Speech-to-Text API, its ability to support multiple languages, and Gladia's commitment to affordability and ease of use make it a compelling choice.

Who are some of Gladia's integration partners?

wrote:

Pipecat, Vapi, Livekit, Twilio, Recall, MeetingBaaS. Learn more here: https://www.gladia.io/partners

Why was Gladia created?

wrote:

We started Gladia in response to a pressing need: to make it possible for any company to easily embed cutting-edge transcription into their products, whatever your language, industry, or tech stack. Audio transcription is the foundation of many great platforms today, so it needs to be rock-solid. We built and optimized the best ASR and GenAI models for speech and language understanding, so you can focus on delivering the best possible user experience without hallucinations, lags, or broken transcripts. Real-time AI is the next frontier that will transform a range of industries. From assisting sales agents on call to providing automated customer support, we have designed the best platform-agnostic engine to power all key enterprise use cases—and going beyond just transcription. Our commitment extends to helping you leverage in-depth insights and metadata from every call and meeting, all in real time. Our ultimate goal is to create a one-stop-shop audio AI infrastructure. The ultimate destination for anyone looking to convert unstructured data from calls into actionable insights for call agents, sales representatives, digital nomads, and content creators worldwide.

Does Gladia have any other additional resources?

wrote:

Aside from our documentation, we have a library of helpful resources including past webinars, ebooks, buyers guides, and more: https://www.gladia.io/library

How can I use Gladia for a note-taker?

wrote:

Enhanced note-taking Leverage Gladia’s asynchronous transcription engine to generate error-free summaries and action items. Our transcripts include speaker separation and timestamping features for a granular overview of each meeting’s roster and agenda.

What do clients say about Gladia?

wrote:

Gladia is rated 4.8/5 stars on G2 with a compilation of their client testimonials here: https://www.gladia.io/testimonials

What is word error rate and how does it apply to Gladia?

wrote:

The Word Error Rate (WER) is a common metric used for measuring the performance of speech-to-text systems. It essentially calculates the number of errors made by a system against the total number of words in the reference. In the context of Gladia, a WER as low as 1% indicates that the Speech-to-Text API could potentially make only one mistake per every 100 words, demonstrating high accuracy.

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