GPT Prompt Tester · Download

Download GPT Prompt Tester

Install a dedicated workspace for GPT API experiments and prompt development
as a Windows desktop app.

Get it on Microsoft Store (Windows 10/11) How to buy a Pro license

Supported OS: Windows 10 / 11 (64-bit) · Internet connection and an OpenAI API key are required.

Windows Desktop

Install GPT Prompt Tester on Windows

GPT Prompt Tester is currently optimized for the Windows desktop environment. You can install it easily via Microsoft Store, or download a direct installer (.exe).

  • Install via Microsoft Store
    Search for “GPT Prompt Tester” in the Windows Store, or click the button above to install.
  • Free mode included by default
    The app starts in Free mode right after installation. Enter a license key to unlock Pro instantly.
  • Automatic updates
    When a new version is released, you’ll get an in-app update notice so you can update easily.

Getting Started

Get started after installation

Once installed, follow these quick steps to finish setup and start running prompt experiments.

1
Launch & check basics
↓

1. Launch GPT Prompt Tester

After installation, open GPT Prompt Tester to start in Free mode by default.
You can immediately try core features like Playground, Web Search, and Reasoning.

2
Set your OpenAI API key
↓

2. Add your OpenAI API key

Go to Settings > OpenAI and enter your OpenAI API key.
GPT Prompt Tester does not provide its own model—your OpenAI account will be billed for usage.

  • Your API key is stored locally on your device in encrypted form.
  • You can update or remove the key anytime from the Settings screen.
3
Use Free / upgrade to Pro

3. Start with Free, upgrade to Pro when needed

In Free mode, you get a single-panel Playground, basic history, and a cost summary dashboard.
If you need multi-panel workflows, template management, advanced history, or deeper dashboards, check the Pricing page to learn about Pro licenses.

macOS / Linux versions are coming

The currently supported platform is Windows 10 / 11.
macOS and Linux builds are planned next, and will be released once we have a stable distribution and update pipeline.

  • We’re focusing on polishing features and stability on Windows first.
  • For macOS, we aim to ship a DMG with official signing and notarization.
  • For Linux, we’re considering an experimental build (e.g., AppImage) for developers and power users.

We’ll announce new platform support in News and on the Pricing page.

FAQ

Frequently asked questions

  • Q. Can I use the Free version forever?
    Yes. The Free plan has no time limit. Some features (like the number of saved history items) are limited.
  • Q. Do I need Pro to use the app?
    No. You can start with Free for most prompt experiments and tuning, and upgrade only when you need multi-panel workflows, template management, or advanced dashboards.
  • Q. Can I use it without an internet connection?
    Due to license verification and OpenAI API calls, GPT Prompt Tester requires an internet connection.

Install GPT Prompt Tester now

Track your GPT API costs and prompt experiments in one place.
Start with Free, and upgrade to Pro when you need more power.

Install from Microsoft Store How to buy a Pro license