A desktop app for macOS and Windows

Your AI editing crew, on your own computer.

Pick your footage and say in a sentence what you're making. Phosphor's agent turns it into a short you can watch, note and approve.

macOS 13 or later (Apple silicon or Intel), or 64-bit Windows. You also need Python 3.11+, FFmpeg, and the Codex or Claude Code CLI. The app checks for these and tells you what's missing.

How it works

Five phases, from one sentence to a finished short.

  1. 1Brief
  2. 2Shape
  3. 3Build
  4. 4Check
  5. 5Review

Brief

Shape

Build

Check

Review

Say what you’re making in a sentence. It asks only the questions that matter.

It works out the plan from your footage and shows its progress and decisions.

It cuts the video and publishes a playable version early.

Every export is checked before you’re asked to approve it.

Watch the cut, leave timestamped notes, send a round. It revises until it’s right.

The built-in reviewer

Watch it work

A playable cut shows up early. Watch it, leave notes at the exact moment, and send them as one round. The agent revises, and you approve when it's right.

Phosphordesk-setup-shortReady
your video00:00 / 00:32
Directorv2 is ready and checked. Approve when you’re happy.
Keep the cold open at the start?
Keep itCut it
Your notes · round 1
00:04Trim the pause before the title.
00:11Hold on the screen a beat longer.
00:19Music a little lower here.
Approve & exportv2 · checked
00:0000:0800:1600:2400:32
V2
V1
A1
Made with Phosphor

A real short, made with Phosphor

Sloppenheimer is a 73-second short made with Phosphor: talking head, captions, motion graphics and b-roll, delivered at 1080 × 1920.

1:13 · 1080 × 1920 · 23.976 fps
Computer controlOff until you switch it on.
you’re driving
⌘⌥⇧S
Control is back with you.
Your hands on the wheel

You stay in control

  • Computer control is off until you switch it on.
  • One shortcut, Stop & take over, hands control straight back to you.
  • It asks only the questions that matter, and shows its progress and decisions as it goes.
  • Nothing is exported until you approve it.
Works with your editor
DaVinci ResolveAfter EffectsPremiere · soon
Lives in your menu barOr the system tray. It keeps working when the window is closed, tells you when it needs you, and never jumps in front of your work.
Reusable across videos

Your look, every time

Keep what makes your videos yours and bring it to the next one.

from reference videosStylesLearned from videos you point it at, then reused on every project.
your assetsAsset kitsThe pieces your videos keep coming back to, ready to go.
drop-inEffectsReusable effects you can bring into the next video.
Local-first

Local and private

Your footage and projects stay on your computer.
It uses the Codex or Claude Code account you already have, with your own sign-in.
Nothing asks for your passwords.
Questions

Good to know

What does it cost?

Phosphor is a free download. The AI work runs through your own Codex or Claude Code account, so it uses that plan rather than a separate subscription.

Which editing apps does it work with?

DaVinci Resolve and After Effects. Premiere support is on the way.

Do I need Codex or Claude Code?

Yes, one of them. Phosphor’s agent runs through the Codex or Claude Code command-line tool, signed in with your own account. The first time you open Phosphor, it checks for the tool and tells you if it’s missing.

Does my footage leave my computer?

Your footage and projects stay on your computer. The agent works through your own Codex or Claude Code sign-in, so anything it sends to the AI model is covered by that account. Phosphor never asks for your passwords.

What computer do I need?

A Mac with macOS 13 or later (Apple silicon or Intel), or a 64-bit Windows PC. You also need Python 3.11 or newer and FFmpeg, plus free space of about three times your footage and another 2 GB.

How do updates work?

For now, updating is a re-download: get the newest version from this page and install it the same way as the first time.

Download

Get started

Install it, open it, and it checks your setup for you.

To update, download the newest version here
Seeing a security warning the first time you open it?

Mac: open System Settings, go to Privacy & Security, and click Open Anyway next to the message about Phosphor.

Windows: if SmartScreen stops the installer, click More info, then Run anyway.

You only need to do this once.

What you need
  • macOS 13 or later (Apple silicon or Intel), or 64-bit Windows
  • Python 3.11 or newer
  • FFmpeg
  • The Codex or Claude Code CLI, signed in with your account
Phosphor checks for these and tells you what's missing.