Home / Free tools
Free tools
Free tools for teams that work with AI
We use these tools in our own work. They are free to download, use, copy and change. Each one runs on your own computer and sends nothing to us.
Voice lint
Catch the habits AI puts in your drafts before anyone reads them.
What it does
Voice lint reads a draft and points to each AI habit by line and column: long dashes, hedges like "just" and "really", stock words, and the humble apology at the top of a bio. It ships with two generic voices, one for a person and one for a brand, and the README shows how to build your own from ten real samples.
Who it is for
Marketing leaders whose teams draft posts, emails and bios with AI in an executive's voice or the company's voice.
What you need
Python 3.8 or newer. Nothing else to install.
Download Voice lint 1.0.0 (zip, 13 KB) . More about Voice lint
Second opinion
Before you trust "it's live" from an AI agent, have a second AI try to prove it wrong.
What it does
Second opinion is a written method and a ready-made reviewer for your AI assistant. It re-runs the one check that settles a claim: it loads the live page, reads the scheduled send time, or looks for the tracking tag. When the answer is unclear, it says "not proven" instead of "done".
Who it is for
Marketing and operations leaders who let AI publish pages, schedule emails or change automations.
What you need
An AI assistant that can read instructions. Built for Claude Code, and readable by any assistant. No code to install.
Image sizes
Make each image for the place it will show, and check it before you upload.
What it does
A size table for event listings, social posts, newsletters and slides, with the pixel size, aspect ratio and safe text area for each place, plus a checker. Point the checker at an image and name the place. It says pass or fail, flags art padded to fit another shape, and gives the smallest text size that will read on a phone.
Who it is for
Anyone who makes or approves images for events, social posts and email, whether the image comes from a designer, a template or an AI tool.
What you need
The table works on its own. The checker needs Python 3.8 or newer and Pillow, a free image library.
Download Image sizes 1.0.0 (zip, 11 KB) . More about Image sizes
Write your company voice
A blank template for the voice and tone rules your AI writing tools follow.
What it does
Eleven sections to fill in: who you are, who you write for, voice traits, tone by situation, words, grammar and format, claims you never make, approved facts, samples, final checks and who to ask. It ends with the steps to give the finished file to an AI tool as standing instructions.
Who it is for
Marketing leads, founders and communications teams who spend too long fixing AI drafts that do not sound like the company.
What you need
Any text editor. It also pastes cleanly into Google Docs, Word or Notion.
Download Write your company voice 1.0.0 (zip, 4 KB) . More about Write your company voice
Licence
All five are released by Unicorn Flames LLC under the MIT licence. You can use them, copy them, change them and share them, including at work. Each zip has a README with the steps and the licence file.
The SHA-256 line lets you confirm the file you downloaded is the one we published. On Windows, run certutil -hashfile FILE.zip SHA256. On a Mac or Linux, run shasum -a 256 FILE.zip.
Want your team to work this way?
We teach marketing and communications teams to use Claude well, no developer required. Checks like these are habits we set up with teams.