FAQ

Which platforms does GptSkin support?

GptSkin supports the Codex desktop app on macOS and Windows. You'll also need Node.js 20+ to run the Skill.

Does GptSkin modify my Codex installation?

No. GptSkin never touches the official app installation package, app.asar, code signatures, your API Key, or your Base URL. Themes are applied at runtime by injecting CSS variables, backgrounds, and controlled decorative layers into the running Codex interface via a Chrome DevTools Protocol (CDP) launch flag bound only to the loopback address (127.0.0.1). The Skill disconnects after injection; the loopback port remains available until that Codex process exits. Everything the Skill does is open source and auditable at github.com/WendongAI/gptskin-skill.

How do I use the free preset themes?

GptSkin ships with 6 free presets — dark-void, sunset-glow, aurora-borealis, snow-peak, city-lights, and minimal-light — no account required. Install the Skill, then in Codex say something like "apply the dark-void preset theme", or run directly:

node ~/.codex/skills/gptskin-theme/scripts/apply-theme.mjs --preset dark-void

How do Credits work? Do they expire?

Custom themes are paid with one-time Credit packages (not a subscription): Builder $9.9/100 Credits, Pro $19.9/500, Studio $49/1500. Building each new image-backed theme costs 20 Credits. Reapplying a saved theme is free. Paid Credits never expire. Bonus Credits granted at sign-up expire after 30 days. If a paid build fails due to a system error on our side, the Credits are automatically returned.

Can Codex create the source image for me?

Yes. Ask Codex imagegen to create a local image, then let the GptSkin Skill pass that file through the same paid --image flow. Alternatively, attach your own JPEG, PNG, or WebP. Every paid custom theme is image-backed.

What happens on the website, and what happens in the Skill?

The website manages your account, Credit purchases, API Key, theme history, and downloadable artifacts. The open-source Skill starts the paid image build from Codex and applies the finished theme locally; the website does not inject themes into the app.

How do I restore the default Codex theme?

Just tell Codex: Restore the default Codex theme. This removes all injected styles and decorative layers and restarts Codex normally — you're back to the stock look in seconds.

Is payment secure?

Yes. Payments are processed by Creem, which acts as our Merchant of Record and handles payment data and applicable taxes. GptSkin never sees or stores your full card number. Unused Credits can be refunded within 7 days of purchase — see our Refund Policy.

A Codex update broke my theme. What now?

Updates to the official desktop app can change internal interface structures and cause themes to stop applying. First, restore the default theme (Restore the default Codex theme) to get back to a clean state. Then check for a Skill update — we work to restore compatibility as quickly as we can. Your Credits are not consumed by failed applications caused by system errors on our side.

Will my uploaded images be used for training?

No. Uploaded images (max 4 MiB, JPEG/PNG/WebP) are used only to build your requested theme. We never use your uploads or completed themes to train models. The injector also never reads your Codex conversations or sends your Codex DOM or session data to the cloud.

Is GptSkin an official OpenAI product?

No. GptSkin is an independent product and is not affiliated with, endorsed by, or officially connected to OpenAI. "ChatGPT" and "Codex" are trademarks of OpenAI, referenced only to describe compatibility.

How do I delete my account?

Email support@gptskin.best from your registered address and we'll delete your account and associated personal data. You can also delete individual generated themes from your account at any time. Support responds within 3 business days.