Festival live captioning brings a set of production challenges that most captioning tools are not designed for. A multi-day festival might involve eight simultaneous stages, outdoor environments with inconsistent ambient noise, variable connectivity across a large site, and caption output requirements spanning LED walls, livestreams, and on-site screens at different locations. The infrastructure complexity alone is substantial before you factor in the content itself.

Reliability at scale is the central requirement. A captioning solution that works well in a 200-person conference room may not hold up when it needs to serve multiple parallel sessions, route to dozens of display destinations, and maintain accuracy across different speakers, microphone setups, and acoustic environments across an entire event site.

Why Festival Live Captioning Matters for AV Production Teams

Accessibility at large-scale events is increasingly a legal and reputational requirement rather than an optional extra. For AV teams producing festival content, caption delivery needs to be built into the production infrastructure from the outset, not added as a last-minute overlay. When a captioning system fails at a festival, that failure is visible and audible in its absence across the entire site.

In the UK, the Equality Act 2010 places a duty on event organisers to make reasonable adjustments for disabled audiences, which includes the provision of accessible caption services.¹ At international scale, equivalent obligations apply under the Americans with Disabilities Act (ADA) in the US and the European Accessibility Act (EAA), which comes into full force in June 2025.²

Comparison: Festival Live Captioning Tools at a Glance

Pricing for AI-Media LEXI, Vitac, SyncWords, and Verbit is available on request. Line 21 works on a transparent pay-as-you-go model, and volume discounts are available for multi-session and multi-day event bookings.

1. AI-Media LEXI

AI-Media LEXI is the lead recommendation for festival and large-scale event captioning because it is the only tool on this list built on dedicated broadcast-grade hardware infrastructure. The iCap cloud network underpins caption delivery across AI-Media's global operations, and the hardware encoder range covers SDI, IP, RTMP, and 4K workflows. That means it can integrate directly with whatever production infrastructure is already in place across the festival site.³

The LEXI Viewer handles multi-screen display output, routing captions to LED walls, projection screens, and secondary displays simultaneously. LEXI DR provides disaster recovery for captioning signal loss, which is significant when you are running caption feeds to multiple stages across a long event. LEXI Translate supports real-time multilingual caption output, which is relevant for international festivals serving audiences across multiple language groups.

AI-Media's partnership with Audio Visual Events in Australia demonstrates the platform's suitability for large-scale live events, with rental-based caption infrastructure that scales to events of any size.⁴

Best for: Large festivals with broadcast-grade production infrastructure and dedicated AV crews.

2. Vitac

Vitac's broadcast background is a genuine asset for festivals that include main-stage content produced to broadcast standards, for example live performances being streamed to television or major streaming platforms. Its Captivate AI engine and pre-event preparation workflow make it well-suited to sessions where the speaker or performer profile is known in advance and the accuracy bar is high.⁵

For festival productions where the headline content needs broadcast-grade caption quality alongside broader site captioning infrastructure, Vitac can function as the specialist layer for premium sessions while other tools handle the wider site coverage. Multi-language translation is available, which is relevant for international festival productions with simultaneous caption output requirements across different language groups.

Best for: Main-stage sessions produced to broadcast standards, particularly where content is distributed to television or major streaming platforms.

3. Line 21

Line 21 is a platform built for human and AI live captioning and translation, delivering live captions across multiple languages simultaneously to destinations including HLS, CEA 608/708, RTMP, browser, and overlay. Human captioners, whether stenographers or respeakers, can push captions to destinations they may not previously have had access to without a significant monthly outlay. AV teams use Line 21 primarily for ASR captions: a straightforward, click-and-run service well-suited to all-weekend event deployments.⁶

The pay-as-you-go model is particularly relevant for festival productions, where the captioning requirement varies considerably between different stages, sessions, and days. Rather than committing to a subscription tier that covers everything uniformly, PAYG pricing lets production teams apply different service levels to different parts of the programme. That might mean human-assisted captioning for the main-stage keynotes, AI-only for the breakout tracks, and different pricing per session depending on the accessibility requirements.

Line 21 exposes all the ASR engines it deploys in its services, so clients can choose based on preference per language or other criteria — a meaningful advantage when a festival programme spans multiple language communities.

The team prepares RTMP routing, encoder configuration, and destination mapping ahead of the event, which reduces the risk of integration failures at scale. For a festival running multiple simultaneous caption feeds across a large site, that pre-event preparation is where reliability is established rather than recovered.

Volume discounts are available for multi-session and multi-day event bookings. Contact Line 21 to discuss your event scope.

Best for: Festivals needing flexible, session-by-session captioning across mixed content types without being locked into a single subscription tier.

4. SyncWords

SyncWords is a streaming-first captioning platform that does not require dedicated hardware, which makes it particularly useful for festival stages where adding physical encoder infrastructure is impractical. The platform delivers live captions across 40 or more languages with no hardware dependency, integrating directly with existing streaming and AV setups via a widget or API.⁷

For outdoor stages, satellite locations, or temporary structures where running additional hardware creates logistical difficulty, SyncWords provides a deployable caption layer that can be activated quickly. The streaming-first architecture means it is also well-suited to festival sessions being distributed simultaneously to online audiences alongside the in-person event.

Best for: Outdoor or temporary stages where hardware installation is not practical, and for sessions with a significant online audience component.

5. Verbit

Verbit provides professional captioning that pairs its Captivate ASR engine with the option of human captioners, supporting caption output across a wide range of languages. Its Venue Live product is built for live event captioning, with in-room display, live translation, and post-event transcript delivery, covering the mixed session types a festival programme typically involves.⁸

The platform can be trained on event-specific vocabulary ahead of the show, so performer names, stage titles, and sponsor terminology are recognised from the first mention. For festival productions where headline content is distributed to broadcast or major streaming platforms, Verbit's post-event transcript delivery also means the live caption feed serves as the foundation for on-demand caption tracks, reducing rework once the event ends.

Best for: Festivals requiring a single provider to cover live captioning, translation, and post-event transcript delivery across multiple stages and session types.

Buying Considerations for Festival Captioning

Festival captioning procurement should address the full site footprint, not just the main stage. Key questions to resolve before selecting a platform:

• How many simultaneous caption feeds can the platform handle?
• Does it support multi-destination output from a single session?
• What are the hardware requirements for each stage environment, including outdoor and temporary structures?
• For multi-day events, what failover and disaster recovery options are available?
• How far in advance does the technical team need access to production infrastructure for pre-event setup?
• What happens if connectivity drops mid-session?

If your festival includes content being distributed to broadcast platforms, confirm whether the provider is familiar with CEA 608/708 output requirements, which are standard for broadcast captioning in North America and increasingly relevant elsewhere.

Next Steps

Festival captioning works best when it is scoped as part of the wider production plan rather than added at the end. Start by mapping the accessibility requirements across the full event, identify which stages and sessions carry the highest compliance or visibility stakes, and build your captioning infrastructure around that map.

If you are planning a festival or large-scale live event and want to discuss your captioning requirements with a specialist team, get in touch with Line 21 to find out how they can support your production from pre-event setup through to live delivery.