Open source · Native macOS

Markdown decks thatrun Codex live.

Codeck workspace Editor · Preview · Assistant

Codeck showing a Markdown editor, rendered slide preview, and reviewable Deck Assistant proposals

Write a readable Markdown deck, run Codex directly on the slide, shape the story with reviewable AI edits, and go full screen without breaking your flow.

View latest release See Codeck in action

macOS 14+ · Live AI requires Codex CLI and an active login.

macOS 14+: Native document app
.mdeck: Readable plain text
MIT: Open-source project

One native loop for

AI training
Live demos
Executive briefings
Hands-on workshops

Inside Codeck

One deck. Three real moments.

Write the source, inspect a runnable Codex card, then present the same file. These are authentic captures from one working .mdeck deck.

Codeck editing the File Format slide in Markdown while rendering its Atelier preview beside the source — 01 · Write

Markdown on one side. The slide on the other.

Edit readable source and watch the themed preview update beside it—no export and no hidden format.

Codeck showing a fenced Codex prompt in the editor and its runnable prompt card in the live preview — 02 · Run

Codex is part of the slide.

A fenced `codex` block becomes a runnable card with its prompt, model settings, and response area kept beside the source.

The Preview And Present slide running in Codeck presentation mode — 03 · Present

The working deck is the final deck.

Launch presentation mode from the selected slide and take the same file straight to the room.

Live Codex

The prompt belongs on the slide.

A fenced codex block becomes a runnable card with its own model, reasoning, and sandbox settings. The answer streams back into the presentation as Markdown.

Run one session or every card on the slide
Use stable IDs for reliable output tracking
Render lists, tables, links, and code in the result

```codex id=first-demo
title: Make it testable
reasoning: high
sandbox: read-only

Give me three observable checks
for this live demo.
```

Make it testable ready

Give me three observable checks for this live demo.

Play the sample to watch a response arrive.

Deck Assistant

Review every AI edit before it lands.

Ask for a tighter slide or a stronger whole-deck narrative. Codeck returns concrete insertions and replacements, so you choose what earns a place in the source.

Slide or deck scope Optional web research Selective apply

Simulated Deck Assistant Slide 2 · Live demo

3 selected

Choose changes for this illustration Sharpen the opening Lead with the behavior the audience can observe. Clarify the sequence Turn the paragraph into a three-step walkthrough. Add a verification step Close with one concrete check the room can follow.

Review before applying.

Current slide 2 / 6

AI demos

Run the prompt and talk through the answer.

Show the prompt
Read the result

Presentation themes

Same source. A different room.

Change the deck's look without rewriting slide content. Try the five themes below.

Studio 04

Live workflow

Make the work visible.

Show the source, run the prompt, and let the audience watch the result arrive.

```codex id=live-demo
title: Verify the result

Name the checks the room can follow.
```

The .mdeck format

Simple enough to own.

Your deck is Markdown with small, explicit YAML settings. Open it in Codeck, inspect it in any editor, review it in Git, or hand it to an MCP-capable agent.

Ready for your Mac macOS 14 or later Codex CLI + login for live AI features Distributed through GitHub Releases

Current builds are ad-hoc signed but not notarized, so macOS may show an unidentified-developer warning on first launch.

---
format: codeck.mdeck
version: 1
theme: studio
codex:
  sandbox: read-only
  reasoning: medium
---

# First slide

Teach the workflow, then run it live.

Your next deck

Make the presentation a working session.

Bring the source, the live demo, and the final story into one native Mac workspace.

View latest release Explore the source

Open source · MIT licensed · macOS 14+