About
Why Capti exists and how it works
Capti is a web-based platform for quickly creating captions for Final Cut Pro. Built for content creators working with short-form content like Reels, TikTok, YouTube Shorts, and Instagram videos.
The Problem
Final Cut Pro's captioning is very limitedand does not allow for Titles which are necessary for any short form video.- People rely on
expensive external software and plugins with subscriptionsthat cost a lot and sometimes don't work as expected. Local-only approaches limit accuracy and speed, with no modern AI tooling integration to optimize the workflow and make the captions more impactful.
The Solution
Capti streamlines the entire workflow:
Cloud Processing
- Better transcription accuracy than local processing
- Works on any Mac (no M silicon requirements)
- Always up-to-date with the latest AI models
Smart Grouping
- AI-powered caption grouping trained on successful short-form content
- Optimizes for readability and engagement
- Manual override when needed
Built for FCP
- Native FCPXML export with full styling
- Imports as editable title clips
- Preserves fonts, colors, and positioning
- Multiple export formats for different needs
Preset System
- Save your caption styles once
- Apply to unlimited projects
- Maintain brand consistency
- Switch between client styles instantly
How It Works
Capti uses AssemblyAI's speech-to-text API for transcription:
- Supports 100+ languages with high accuracy
- Word-level timestamps (precise to milliseconds)
- Trained on diverse accents and speaking styles
- Continuously improving with new model updates
The automatic grouping feature uses AI to:
- Detect natural speech patterns and pauses
- Calculate optimal reading speed for viewers
- Balance line length for mobile screens
- Follow platform best practices for engagement
Each batch processes in ~30 seconds, analyzing audio patterns and transcript structure.
When you export, Capti generates a valid FCPXML document:
- Creates a project with title clips for each caption
- Applies your preset styling (fonts, colors, positions)
- Sets precise timing from word timestamps
- Packages as an importable FCP library
Tech Stack
Capti is built with modern web technologies organized by function:
See our Contact page for support, feature requests, and bug reports.