CaptionHub
CaptionHub is a London-based enterprise SaaS platform, founded in 2015, that uses AI orchestration to automate multilingual video subtitling, translation, live captioning, and synthetic voiceover for global enterprises, broadcasters, language service providers, and large non-profits across 316 languages.
- Company typePrivate
- Founded2015
- HeadquartersLondon, United Kingdom
- Headcount11–50
- GTM typeB2B
- OfferingSoftware
What CaptionHub does
CaptionHub is a London-based private SaaS company, founded in 2015, that operates an AI-powered collaborative multimedia localization platform used by global enterprises, language service providers, broadcasters, and large non-profits. The platform ingests video, runs it through automated speech recognition and machine translation engines, enables human review and editing in a collaborative editor, and publishes multilingual captions and synthetic voiceovers back to major online video platforms. Its product portfolio consists of the core CaptionHub Platform (transcription, translation, and subtitle publishing across 316 languages), Timbra for real-time live event subtitling in 130 languages, CaptionHub Voiceover for AI-generated voiceover in 70+ languages with 150+ voices, Automation & API for no-code and programmatic workflows, and CaptionHub Connect for secure vendor collaboration. The underlying technology is an AI orchestration layer rather than a foundation model: CaptionHub plugs into third-party ASR, MT, and TTS providers (Amazon, Google, OpenAI, DeepL, Speechmatics, ElevenLabs) and applies its proprietary Natural Captions© technology to improve caption quality and timing.
CaptionHub monetizes through a hybrid subscription-plus-usage model. It offers Professional and Enterprise annual subscription tiers, with the Enterprise tier unlocking API access, SSO, custom development, automation templates, and 24/7 support. Billing is anchored to output minutes consumed per language version, with voiceover billed at the point of synthetic voice creation. Go-to-market is primarily consultative enterprise sales (the website funnels to a "Book a Demo" CTA), complemented by a self-serve Professional tier and a public REST API with webhook support for programmatic workflows. Marketing is multi-channel, including webinars, blog content, customer case studies, Capterra and GetApp reviews, and conference presence.
The customer base is horizontal and enterprise-tilted, spanning financial services (Allianz, Prudential, Fidelity, Aegon, Transamerica, Investec), public sector (NHS), media and broadcasting (BBC Studios, TED), automotive (Ford), technology (Microsoft, Nvidia), gaming (Supercell), consumer products (Mattel, Brompton), and language services (RWS). TED represents the flagship community-scale reference, with 38,946 volunteer translators producing 186,431 translations on the platform. CaptionHub is privately held, founder-led by CEO Tom Bridges, with CCO James Jameson supporting commercialization. The company is incorporated as CaptionHub Ltd in England and Wales, holds ISO 27001 and Cyber Essentials Plus certifications, and has not disclosed any external funding rounds, M&A activity, or revenue figures.
CaptionHub firmographics
Firmographics- Name
- CaptionHub
- Legal name
- CaptionHub Ltd
- Website
- https://captionhub.com
- Company type
- Private
- Founded year
- 2015
- Operating status
- Operating
- Headcount range
- 11–50 employees
- Short description
- CaptionHub is a London-based enterprise SaaS platform, founded in 2015, that uses AI orchestration to automate multilingual video subtitling, translation, live captioning, and synthetic voiceover for global enterprises, broadcasters, language service providers, and large non-profits across 316 languages.
- Ownership category
- akta.pro rank
CaptionHub industry classification
Industry- Product category
- Multimedia Localization Software
- NAICS
- Software Publishers (513210), Postproduction Services and Other Motion Picture and Video Industries (51219), Other Sound Recording Industries (512290)
- SIC
- Services-Prepackaged Software (7372), Services-Allied To Motion Picture Production (7819)
- akta.pro primary industry
- Localization Technology & Automation (TMS, Subtitle Tools, MT/AI, Speech-to-Text) (MPAHAFAH)
- akta.pro secondary industries
- Subtitling & Captioning Services (Timed Text, SDH/CC) (MPAHAFAA), Voice Cloning, Dubbing & Audio Generative Media (HDAAAFAK), Speech Translation & Multilingual Speech Tech (HDAAAFAE)
Keywords
Where CaptionHub is headquartered
LocationHeadquarters
- HQ city
- London
- HQ country
- United Kingdom
- HQ region
- Europe
Offices1 record
Markets served
CaptionHub business model
Business model- GTM type
- B2B
- Offering type
- Software
- Cost components
- Personnel, Technology or R&D, Infrastructure, Marketing or Sales, Operations
Revenue model
- Output Minutes Subscription: CaptionHub bills based on output minutes. Each tier has an annual output minute allowance. When a language version is downloaded or published for the first time, minutes are deducted from the allowance. Subsequent exports do not affect the balance. Voiceover is billed at the point of synthetic voice creation.
- Subscription Plans: CaptionHub offers Professional and Enterprise subscription plans. Plans can be cancelled or downgraded at the end of the billing period and upgraded at any time. Enterprise customers receive additional features including API access, SSO, and 24/7 support.
Pricing tiers
| Model | Billing | Price |
|---|---|---|
| Subscription | Annual | Professional Plan |
| Subscription | Annual | Enterprise Plan |
Go-to-market motion3 records
Distribution channels4 records
Marketing channels7 records
CaptionHub product offering
Product offeringCore offering
CaptionHub sells an AI-powered collaborative multimedia localization SaaS platform that enables enterprises and language service providers to transcribe, translate, and publish multilingual subtitles and voiceovers for video content. The platform combines automated speech recognition, machine translation, and neural text-to-speech with collaborative editing workflows, supporting 316 languages for captioning, 130 languages for live event subtitling, and 70+ languages for AI voiceover generation. Customers consume the platform via web application, REST API, and integrations with major online video platforms and translation management systems.
Product overview
CaptionHub is an AI-powered collaborative multimedia localization platform offering multilingual subtitling and voiceover as a unified product. The core CaptionHub Platform handles transcription, translation, and subtitle publishing across 316 languages. This core is extended by Timbra for real-time live event subtitling (130 languages), CaptionHub Voiceover for synthetic AI voiceover generation (70+ languages, 150+ voices), Automation & API for no-code and programmatic workflow automation, and CaptionHub Connect for secure vendor collaboration. The ecosystem is unified through shared workflows, AI engines, and integrations with video platforms, TMS tools, and AI providers.
Differentiator
Problem solved
Functional benefit
Products and services
- CaptionHub Platform Core AI-powered collaborative platform for multilingual subtitling that transcribes video audio, translates captions across 316 languages, and publishes subtitles to integrated online video platforms. Designed for enterprises and language service providers requiring large-scale multilingual video localization with collaborative editing workflows.
- Timbra (Live Subtitles) Real-time video event subtitling product providing zero-latency subtitle generation in 130 languages with highly customizable AI for company-specific terminology. Supports HLS, RTMP, and SRT stream inputs, and integrates with Microsoft Teams, Zoom, and streaming platforms for live event captioning and broadcast accessibility.
- CaptionHub Voiceover Enterprise-grade text-to-speech service that creates synthetic voice-overs in 70+ languages with 150+ voices using neural and standard TTS technology. Includes voice cloning support via ElevenLabs integration, enforced sync for video timing, and the ability to maintain background audio during voiceover generation.
- CaptionHub Automation & API Programmatic automation offering providing a public REST API (with documentation at api-docs.captionhub.com) and no-code Automation Templates that enable instant transcription and translation of video content into multiple languages end-to-end from ingest to delivery. Available to Enterprise customers, supporting programmatic project creation, transcription, translation, caption download, and webhook-driven event notifications.
- CaptionHub Connect Secure collaboration product that enables client teams to work with external language vendor teams on transcriptions and translations without exposing sensitive user data. Supports both direct assignment and self-serve workflows, with full AI tool access for vendors, automated routing, and enterprise security controls.
Quantifiable outcome
- 10-fold cost savings over traditional dubbing
- +4 more outcomes
Companies that use CaptionHub
Customer profileNamed customers20 records
Segments4 records
Ideal customer profiles4 records
CaptionHub technology and API
TechnologyTechnology focussed Yes
API detail
- Has API
- Yes
- API docs
- API detail
Core technology
AI maturity
App detail
Integration36 records
AI capability7 records
Feature6 records
CaptionHub partnerships and signals
Strategic signalPartnerships
13 partnerships are on record, tiered core.
- BrightcovecoreNative integration with Brightcove video platform for seamless video ingest and caption publishing. Supports Brightcove Live for real-time captioning and Brightcove connector for automated workflow triggers.
- VimeocoreIntegration with Vimeo video platform enabling automated caption workflows and video publishing capabilities.
- KalturacoreNative integration with Kaltura video platform for enterprise video management and caption automation.
- AWScoreAWS infrastructure hosting with Amazon Transcribe for transcription, Amazon Translate for translation, Amazon Polly for text-to-speech, and S3 for storage.
- PhrasecoreTMS connector enabling integration with Phrase translation management system for enterprise translation workflows.
- TradoscoreTMS connector for SDL Trados integration enabling enterprise translation management and localization workflows.
- GooglecoreIntegration with Google Workspace API and Google Translate for transcription and translation services. Supports Google Apps SSO for enterprise authentication.
- YouTubecoreYouTube API integration for video import and caption publishing capabilities.
- ElevenLabscoreElevenLabs connector for voice library access, enabling users to add custom AI voices to their CaptionHub Voiceover library for synthetic voiceover creation.
- DeepLcoreMachine translation provider integration for high-quality neural machine translation within CaptionHub workflows.
- SpeechmaticscoreSpeech-to-text transcription provider for accurate automatic speech recognition.
- OpenAIcoreIntegration with OpenAI for AI-powered transcription and translation services.
- Auth0coreAuthentication platform providing SSO and secure login capabilities for CaptionHub platform.
Scale indicators8 records
Recent moves6 records
Expansion highlights6 records
CaptionHub competitors and assessment
Company assessmentMarket position
Competitive moat5 records
Key highlights7 records
Customer concentration
CaptionHub social profiles
Digital presenceCaptionHub compliance and trust
Trust signalCompliance2 records
CaptionHub financial estimates
Financial estimateRevenue estimate
Valuation estimate
CaptionHub leadership team
Management profileNumber of profiles
Profiles2 records
CaptionHub funding detail
Funding detailFunding overview
Funding rounds
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
CaptionHub M&A and investment
M&A and investmentM&A
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about CaptionHub
What does CaptionHub do?
CaptionHub sells an AI-powered collaborative multimedia localization SaaS platform that enables enterprises and language service providers to transcribe, translate, and publish multilingual subtitles and voiceovers for video content. The platform combines automated speech recognition, machine translation, and neural text-to-speech with collaborative editing workflows, supporting 316 languages for captioning, 130 languages for live event subtitling, and 70+ languages for AI voiceover generation. Customers consume the platform via web application, REST API, and integrations with major online video platforms and translation management systems.
Is CaptionHub a public or private company?
CaptionHub is a private company. It is classified as founder individual operated bootstrapped and is currently operating.
When was CaptionHub founded?
CaptionHub was founded in 2015. It employs 11 to 50 people.
Where is CaptionHub based?
CaptionHub is headquartered in London, United Kingdom, in the Europe region.
How does CaptionHub make money?
Two revenue lines are on record. Output Minutes Subscription is the primary driver. The others are subscription Plans.
Does CaptionHub have an API?
Yes. CaptionHub offers a public REST API enabling developers to programmatically create projects, generate original captions via transcription, create translated caption sets, download captions in various formats (including VTT), configure webhooks for real-time event notifications, and automate subtitle workflows. The API is available to Enterprise customers. Webhooks support events including project.encode_completed, caption_set.transcribed, and caption_set.translated. Developer documentation is at api-docs.captionhub.com/docs/captionhub/b0fb6beb9cd7e-caption-hub-api.
What industry is CaptionHub in?
CaptionHub's product category is Multimedia Localization Software. Its primary akta.pro industry code is MPAHAFAH, Localization Technology & Automation (TMS, Subtitle Tools, MT/AI, Speech-to-Text), with a secondary code of MPAHAFAA, Subtitling & Captioning Services (Timed Text, SDH/CC). Its NAICS code is 513210 and its SIC code is 7372.