What are SyncWords live captions?

SyncWords live captions provide real-time text of spoken audio for live broadcasts, streams, and in-venue productions. Captions are generated with low, predictable latency and delivered reliably across broadcast outputs, streaming players, personal devices, and in-room displays.

How accurate are the captions?

SyncWords uses high-quality speech recognition and accuracy is optimized for live environments where clarity, speaker changes, and fast pacing matter most.

How much delay is there?

SyncWords can deliver captions with sub two second latency in SRT broadcast workflows. It is designed for use in live environments which helps ensure captions stay readable and closely aligned with the audio, whether in a room, on a stream, or over a broadcast signal.

Do captions work for large or complex live productions?

Yes. SyncWords is built for high-pressure live environments, including large in-person events, hybrid productions, and broadcast workflows where reliability, stability, and scale matter.

What languages are supported?

SyncWords supports live captioning in over 60 languages, with options to add real-time translation and multilingual caption outputs depending on your workflow.

What formats and standards are supported?

SyncWords supports industry-standard caption formats and live workflows, including integrations with broadcast, streaming, and event production systems.

How long does setup take?

Setup is fast and scalable. Most captioning workflows can be configured in minutes, whether you're supporting a live broadcast, a single session or a multi-day, multi-room event.

Are SyncWords captions accessible and compliant?

Yes. SyncWords captions support accessibility requirements for live events and broadcasts, helping organizations meet inclusion and compliance standards while improving the experience for all attendees.

Why not just use built-in captions from our streaming platform?

Built-in tools often work only inside a single player and are not great for multi-language support or broadcast-quality accuracy. SyncWords delivers captions everywhere (personal devices, in-room displays, and streams) while maintaining consistent performance and control across all surfaces. Most clients come to us when they need more control, higher accuracy, or multiple languages at once, especially for public-facing or high-stakes events.

The Fastest AI Live Captions

SyncWords makes live events and broadcasts accessible, compliant, and globally engaging with instant real-time closed captions.

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LIVE

But looking back, I think it's the best decision we ever made.

Simple integration

Robust AI accuracy

Uptime 99.999%

Unmatched AI Accuracy

SyncWords uses high-end AI enhanced with Custom ASR Dictionaries. Upload your speaker names, technical jargon, and specific terminology beforehand.

Audio

Dictionary

Speech-to-text

Lowest Latency

Fastest latency with accurate AI transcription or choose CART human hands for premium accuracy.

Fastest & Most Reliable

Compliance Made Simple

Our automated workflow ensures your live events are inclusive for the Deaf and Hard-of-Hearing community without the high cost of human stenography.

ADA, FCC, CVAA Compliant

99.999%

Broadcast reliability

Mission-critical uptime

Delivery

HLS, RTMP(S) and SRT

Cloud Workflows

End-to-end automation

MediaLive

MediaPackage

CloudFront

Amazon S3

Your CDN

FAST Channels

FCC Compliance

Built for Broadcast

Enhanced accuracy: Robust AI with custom ASR Dictionaries.

Standards supported: VTT, CEA-608 and more...

Self-service, or use our dedicated expert technicians.

Cloud-native Unicode + DVB-TTML: Built for international or local broadcast from the ground up.

Delivery Methods

HLS

RTMP(S)

SRT

Streaming HLS, RTMP(S) & SRT

Push captions directly into the stream headers. Compatible with social platforms and broadcast encoders.

Direct Ingestion Supported

+

Widget & URL + QR Code

An agile HTML iframe alongside video, or a standalone URL. Includes auto-generated QR codes for second-screen experiences.

Ideal for Zoom, Webex & In-Person

Embedded Player

Integrate our Embed Player directly into your website. Viewers toggle tracks inside the menu.

Works with JW Player, THEOplayer, Video.js

Learn About Integration Options

Technical Features at a Glance

Ultra-Low Latency	Captions appear synchronously with the audio, minimizing delay for real-time engagement.
Profanity Filtering	Automatic filtering to ensure your stream remains brand-safe and professional.
RESTful API	Automate scheduling, dictionary uploads, and event creation directly from your CMS.
4K Ready	Fully compatible with high-definition and 4K video workflows without performance loss.
Archiving	Automatically generate a corrected transcript and VTT file for VOD immediately after stream.

FAQs