Live event captioning

Choose offline certainty or cloud-powered accuracy.

Two powerful captioning tools built for live events. Go fully local for ultimate privacy, or leverage cloud-based technology.

Desktop, offline

Air-Gap-Cap

Fully offline captioning for air-gapped workflows
Desktop install with PIP and extended screen options
Transcribe WAV, MP3, M4A, and MP4 recordings offline — export TXT or PDF
Industry glossary with vocabulary hints for names, venues, and specialist terms
Single-line, double-line, or full-screen captions with chroma-key themes
Whisper Fast, Balanced, and Accurate engines — pick speed or accuracy for the room
Best when privacy and isolation outweigh remote access
Local-only processing with no cloud accounts or remote streams
Minimum: Apple Silicon (M1+), 8GB RAM, macOS 13+, audio input, 2GB storage.
Recommended: Apple Silicon, 16GB RAM (for default engine & multi-display shows).

Online, cloud STT

Accurate browser-based live captions
Fast, accurate intelligent transcription and captions paid by the hour
Simply send the caption links to the technician using our friendly dashboard
Optional audience phone captions via QR and shareable links
Single-line, double-line, or full-screen caption output
Requires stable internet connectivity — minimum 10 Mbps down / 2–3 Mbps up per room, wired if possible.
Pricing: First 4 hours: £30 (includes up to 1 hour for tech tests). Each additional hour: Only £5 (+ VAT where applicable).
Audience phones: Add optional captions directly to audience phones via QR