Download PromptMason

For Windows 10 or later (64-bit). Includes 14 days of Pro, free, with no limits.

Mac and Linux versions are coming soon.

PromptMason for Windows

Digitally signed

Just your email, so we can send you the download link. No card, no account.

New apps can get a "not commonly downloaded" warning in your browser. PromptMason is digitally signed: choose Keep. How to install

What you get

Enter your email, and the next page gives you the installer. You don't need a key. We don't email you anything else unless you tick the box for news.

PromptMason opens with 14 days of Pro, with no limits. Every feature is in Free too; Pro removes the limit on blocks and prompts.
After 14 days, PromptMason moves to the Free plan: 25 blocks and 15 prompts. Nothing is deleted. If you have more than that, you can still see and export everything, but you can't add, edit or copy until you buy Pro or delete some.
To keep Pro, buy it any time at the launch price of $7 a month or $69 a year, kept for as long as you stay subscribed. See pricing.

Built-in Private AI

PromptMason includes a free AI model that runs on your own computer, so you can improve a block, grade a prompt or chat with no API key, no account and nothing leaving your computer. It's a separate download of about 1.3 GB that you start from Settings, then AI & connected apps, only if you want it. It needs at least 4 processor cores and 8 GB of memory, and no graphics card. More about Built-in Private AI

Prompt library

Don't start from a blank page. Seven starter packs come built in, and the prompt library on promptmason.ai has Mega packs for professions and industries, free to download. See the prompt library

After you download

Open the installer. Windows may ask you to confirm before it runs.
Open PromptMason. Your 14 days of Pro start by themselves.

If you buy Pro, you get a key. Click Settings, then Plan, paste the key and click Activate.