Codex GUI

You have a Codex GUI. Now you need a workspace.

The Codex desktop app gives you a chat window. Nimbalyst gives you multi-session management, visual editors for mockups, diagrams, and data models, task management, and a mobile app — all built on top of Codex and Claude Code.

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Also available for: macOS Apple Silicon macOS Intel Windows Linux

Nimbalyst — Codex GUI workspace with agent mode, file edits, and session management

Codex has a GUI. So why Nimbalyst?

OpenAI shipped a Codex desktop app with a clean graphical interface for running sessions. It's a solid chat-based GUI for working with a single Codex agent.

But a GUI is not a workspace. When you're running five agents in parallel, reviewing diffs across branches, sketching architecture diagrams, mocking up UI, and managing tasks — a chat window isn't enough. Nimbalyst supports both Codex and Claude Code as first-class agents, so you can pick the best engine for each task inside one workspace.

Why Nimbalyst

What Nimbalyst adds to Codex

WYSIWYG markdown editor

Write specs, plans, and docs in a rich editor. Your Codex agent sees the full document and project — edit by hand or let AI draft and restructure.

Visual diff review

Review Codex changes with inline red/green diffs. Accept, reject, or manually edit each change before merging — across markdown, code, and config files.

Visual editors

Mockups, Excalidraw diagrams, data models, spreadsheets, and markdown. Your Codex agent can create and edit visual files, not just code.

Session kanban

Manage Claude Code and Codex sessions on the same kanban board. Mix and match engines across branches and tasks.

Task management

Track tasks, bugs, and ideas alongside your Codex sessions. Plan the work and execute it in the same environment.

First-class Codex support

Run Codex sessions natively inside Nimbalyst. Same visual workspace, same session management, same diff review — just a different engine.

Comparison

Codex GUI vs Nimbalyst

Feature	Codex GUI	Nimbalyst
Agent engine	Codex only	Codex + Claude Code (side by side)
Interface	Chat window	Visual workspace with chat, editors, and file tree
Session management	Single session per window	Multi-session kanban with search, filter, and resume
Parallel sessions	Limited	6+ parallel sessions with unified status view
Visual editors	None	Markdown, mockups, diagrams, data models, spreadsheets
Diff review	Terminal-based	File-by-file visual diffs with accept/reject
Planning & tracking	None	Built-in task tracker and plan documents
Mobile app	None	iOS app for monitoring and review
Git isolation	Manual	Automatic worktree per session

FAQ

Frequently asked questions

Does Nimbalyst support OpenAI Codex?

Yes. Nimbalyst supports Codex as a first-class agent engine alongside Claude Code. You can run Codex sessions, manage them on the kanban board, review diffs visually, and use all the same workspace features.

Can I run Codex and Claude Code side by side?

Yes. Nimbalyst lets you run both engines simultaneously. Use Claude Code for one task and Codex for another, compare their outputs, or choose the best engine per project.

Is there a Codex desktop app?

Yes — OpenAI offers a Codex desktop app with a chat-based GUI. Nimbalyst goes further by wrapping Codex in a full workspace with multi-session management, visual editors, diff review, planning tools, and a mobile companion app.

Is Nimbalyst free for Codex users?

Yes. Nimbalyst is free for individual use. You bring your own OpenAI API key for Codex. You can also use Claude Code with an Anthropic API key or subscription.

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Nimbalyst is the visual workspace for building with Claude Code and Codex