Codex GUI

The Codex App is a command center. Nimbalyst is the multi-agent workspace.

The official Codex App runs multiple Codex agents with parallel threads, worktrees, diff review, skills, and automations. Nimbalyst adds Claude Code beside Codex, visual editors for the artifacts around the code, linked task tracking, and a shared team workspace.

Download Nimbalyst

Free for individuals. Works with your existing Claude Code or Codex subscription or API key.

Other downloads: Apple Silicon Mac Intel Mac Windows Linux

The Codex App is strong. So where does Nimbalyst fit?

OpenAI's Codex App is a serious command center for Codex. It runs multiple agents in parallel, isolates work with built-in worktrees, reviews changes inside each thread, and extends the agent with skills and scheduled automations.

Nimbalyst solves a broader coordination problem. It runs Codex and Claude Code as first-class agents, then connects their sessions to markdown, mockups, diagrams, code, trackers, and team collaboration. Use the Codex App when an OpenAI-only command center is the goal. Use Nimbalyst when the workspace needs multiple agent engines and first-class visual artifacts around the code.

Why Nimbalyst

What Nimbalyst adds to Codex

WYSIWYG markdown editor

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

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

Visual editors

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

Session kanban

Session kanban

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

Task management

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

First-class Codex support

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

Open source

The Nimbalyst desktop and iOS apps are MIT licensed. The full source is on GitHub, so you can read the code, audit how Nimbalyst talks to Codex, fork the project for your team, or contribute fixes. No black box between you and your agent.

Comparison

Codex App vs Nimbalyst

Feature Codex App Nimbalyst
Agent engine Codex only Codex + Claude Code (side by side)
Interface Command center with threads, diffs, files, terminals, and browser Visual workspace with chat, editors, and file tree
Session management Multiple agent threads organized by project Cross-agent kanban with search, filter, phases, and resume
Parallel sessions Multiple Codex agents in parallel 6+ Codex and Claude Code sessions with unified status
Visual editors Files, terminals, browser; no linked artifact-editor suite Markdown, mockups, diagrams, code, data models, spreadsheets
Diff review Review and comment on changes inside a thread File-by-file visual diffs with accept/reject
Planning & tracking Skills, automations, and project threads Plans and trackers linked to sessions and files
Mobile app Codex access through the ChatGPT mobile app iOS app for monitoring and review
Platforms macOS, Windows (no Linux) macOS, Windows, Linux, iOS
Git isolation Built-in worktrees for parallel agents Optional one-click worktree per session
Source code App closed source; Codex CLI open source Open source on GitHub (MIT)

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 the Codex App, a command center for running multiple Codex agents with parallel threads, worktrees, diff review, skills, and automations. Nimbalyst is the broader workspace option when you also want Claude Code, linked visual artifacts, trackers, and team collaboration.
Is there a Codex desktop app for Linux?
The official OpenAI Codex desktop app runs on macOS and Windows only, with no Linux build in 2026. Nimbalyst runs on Linux, macOS, and Windows and treats Codex as a first-class engine alongside Claude Code, so Linux developers get a full visual workspace around Codex with parallel sessions, a kanban board, git worktree isolation, and inline diff review. The Codex CLI also runs on Linux if you only need the terminal agent.
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.
Is Nimbalyst open source?
Yes. The Nimbalyst desktop and iOS apps are MIT licensed and the full source is on GitHub. You can read every line, audit how they talk to Codex, run them locally, fork the project, or contribute fixes.

Learn More

Related guides and comparisons

Codex for Product Managers

Use Codex as a PM in a visual workspace for planning, mockups, and review.

Best Codex GUI Tools (2026)

A roundup of desktop apps and GUIs for OpenAI Codex, including Linux options.

OpenCode vs Codex vs Claude Code (2026)

How Codex compares with OpenCode and Claude Code on architecture, benchmarks, and pricing.

What is OpenCode?

The primer on the open-source, model-agnostic agent Nimbalyst plans to run alongside Codex.

Codex vs Claude Code

How the two coding agents compare, and running both in one workspace.

Agent Harness for Claude Code and Codex

The hub for running Codex, Claude Code, and other agents inside one durable workflow layer.

Agent Integration

How Nimbalyst integrates with Claude Code, Codex, and MCP servers.

Session Management

Deep dive into the multi-session kanban and parallel agent workflows.

Nimbalyst is the open-source visual workspace for building with Codex, Claude Code, and more

Download Nimbalyst

Free for individuals. Works with your existing Claude Code or Codex subscription or API key.

Other downloads: Apple Silicon Mac Intel Mac Windows Linux

Nimbalyst Teams is multiplayer. Your whole team, Codex, and Claude Code in one shared workspace.