Fact-based ad copy writer
Paste facts and buyer. Get an ad built on one real fact, with the source of every line.
Fact-based ad copy writer is a free AI prompt for the job "Write ad copy". Give the instructions to an AI assistant that supports the required files and tools, then review its output.
Free · No account · Made by AI Blocks · Tested
What it does
Most ads fail for one of two reasons. They praise the product in words anyone could use ("premium", "high quality"), or they promise more than the product can back up. Readers have learned to discount both. What they believe is a specific fact, because it sounds like something the seller has checked. This skill works from your buyer's point of view. First it asks what this buyer wants and what makes them hesitate. Then it searches your product facts for the single detail that answers that, such as a dose, a material or a step in how it's made, and builds the whole ad on it: the first line, the headline, the picture and the next step. Every claim is checked against your facts, numbers keep their exact wording and conditions, and anything you can't prove is flagged instead of written.
You give it
- Who the ad is for, what they want, and what makes them doubt
- Your product facts and the claims you're allowed to make
- The ad format and its length limits
- Your real offer terms, if you're using one (optional)
- A draft line, script or image to improve (attach the image; your AI can see pictures) (optional)
You get
- The finished ad copy in your format
- A note on the image so the picture says the same thing
- A list of which fact backs each line, and what's missing
- Any of its own checks the ad still misses, one line each
Use it when
- You have a product with real details, but your ads sound like everyone else's.
- You're worried an ad overclaims, and want each line backed by something you can show.
- You're writing for one specific buyer, for example people who tried a competitor and gave up on it.
How to use it
- Start a chat with the skill. Open it if you added it to your AI, or copy it and paste it in.
- Paste your product facts underneath. A facts panel, spec sheet or product page all work.
- Say who the ad is for in one or two sentences, including what makes them hesitate.
- Name the format and its limits, for example "Facebook image ad, main text under 125 characters, headline under 40".
- Read the notes at the end first. If it says MISSING, decide whether to find that fact or drop the claim.