Concat rebuilds the CapCut workflow — multi-track timelines, cuts, transitions, styled titles, templates — as a native Rust app that never leaves your machine: auto-captions and text-to-speech both run locally, offline. It’s a beta, tagged v0.2.2, but a real one, with actual installers for macOS, Windows and Linux (plus Android and iOS builds), not just a README — the macOS build is unsigned, so it needs one quarantine command before it’ll open. No watermark, no subscription, no account.