Muxy — txw

01 Built for the Mac

Native Swift

Pure Swift from the interface down to the GPU dispatch — no Objective-C, no Electron, no third-party runtimes. Just the app and Apple’s frameworks.

Liquid Glass

Built on macOS 26’s Liquid Glass material — translucent, adaptive surfaces that frost under Reduce Transparency and pick up a border under Increase Contrast, on their own.

Metal, one GPU pass

The whole wall composites in a single batched Metal render pass. Each clip is an IOSurface-backed texture sampled straight off the decoder — no CPU round-trip, no per-frame stitching.

AVFoundation & VideoToolbox

Decoding, compositing, and hardware HEVC encoding all run on Apple’s AVFoundation and VideoToolbox frameworks.

02 What it is

Point Muxy at one or more folders of footage. It scans the clips, reads each one’s resolution and orientation, and lays them out on the canvas shape you choose — landscape, ultrawide, square, or portrait. What comes back is a single video file with everything on screen at once.

It handles mixed portrait and landscape footage in the same wall: it lays out the cells, composites every frame on the GPU, and encodes the result to HEVC in one pass.

03 How it works

01

Add folders

Drop in one or more folders. Muxy scans them and probes every clip for resolution, orientation, and duration.
02

Pick a canvas

Choose a shape — landscape, ultrawide, square, or portrait — and a target size up to 8K.
03

Choose a layout

Grid puts every clip in a uniform cell. Mosaic balances the wall so each clip gets its share, and groups portrait phone clips into columns instead of stretching them.
04

Watch it render

Progress, frame rate, and time-remaining update as every frame is drawn in a single Metal pass and encoded straight to HEVC by VideoToolbox.
05

Save

Get one MP4. Output is fragmented, so even an interrupted render leaves a playable file.

04 What’s in it

Balanced mosaic

A weighted treemap gives every clip its share of the canvas — no single clip dominates.

Portrait grouping

Phone clips tile into columns instead of stretching or letterboxing.

Cycling

Rotate clips through the on-screen slots so every clip gets shown, even when the wall is full.

Any aspect ratio

Landscape, ultrawide, square, or portrait — pick the canvas that fits where the video lands.

Intro skip

Trim shared intros and logos off the front of every clip, all at once.

Progress & cancel

Frame count, sustained fps, and time remaining — cancel any time, keep a playable file.

Hardware HEVC

VideoToolbox HEVC encoding — roughly half the file size of H.264 at equal quality.

Crash-safe MP4

Fragmented output, so an interrupted render still leaves a playable file behind.

05 See it

Muxy tiling clips from a folder into a single balanced video wall — balanced mosaic · live on the canvas

Muxy balancing clips across a 16:9 canvas — every clip gets its share of a 16:9 canvas

Muxy square 1:1 canvas preset — square 1:1 — built for feeds and album art

Muxy vertical 9:16 canvas with portrait clips grouped — vertical 9:16 — portrait clips grouped into columns

Muxy cycling mode rotating clips through six on-screen cells — cycling — more clips than cells, rotated with a live preview

06 Get it

Muxy is native macOS, built for macOS 26 (Tahoe) and later, and it’s now on the Mac App Store. Drop in a folder and you’re compositing in seconds — on-device, no account, no network.