Crisp is an offline video enhancer for Mac and Windows. It restores, denoises and upscales footage to 4K on-device, then lets you edit it on a real timeline with auto-montage cut to the beat.

One price - pay once, yours forever, no subscription, no credits, no cloud bill. Up to 3 computers.
Private by default - every frame processed on your own machine, nothing uploaded, works offline.
Free tier - full editor and 4K upscaler with 15-second enhanced exports carrying a small mark.

By Kerr & Company, Grand Rapids. 30-day refund.