Try Seth free before you buy.

Open Seth. Paste a message you have not sent yet and see how Seth helps you master the moment before send.

Try Seth free →

Yes. Seth works on the free tier of ChatGPT. You install it as a custom GPT and it runs inside your existing account. No Subscription required.

Immediately after purchase you'll receive an email with a direct install link.

Click it, and Seth installs into your ChatGPT account in under 5 minutes.
No downloads, no IT department, no setup beyond that.

Download the Seth User Guide →

The $395 individual install is for ChatGPT only.

We offer Seth for Claude and Copilot as part of the Teams install — $4,950 for organisations who want it deployed across their whole team and multiple platforms. Head to the Teams page if that's you.

No. $395 once. No recurring charges. Use it for as long as ChatGPT supports custom GPTs.

Anything you'd send to someone who needs to understand it, act on it, or decide from it. Emails, proposals, capabilities statements, board updates, client briefs. If the message matters, Seth is worth running it through.

Seth is built to find something worth improving in almost any piece of communication. If you run your first message through it and genuinely come away with nothing useful, contact us at admin@appliedthinking.com.au. We'd rather fix that than keep your money.

Seth runs inside your existing ChatGPT account. Applied Thinking does not store, access, or process the messages you paste into Seth that sits entirely within OpenAI's environment and their data handling terms. Our Safety & Governance document covers our approach in full.

Download the Safety & Governance document →