AI ad copy generator: one brief, four platforms, three variants each

Good ad copy is not one line pasted everywhere. Meta wants a hook and a story, Google wants 30 characters that match the search, TikTok wants a sentence that sounds spoken, LinkedIn wants a professional angle. AdHarbor writes all four from a single brief.

What you get from one brief

Platform	What AdHarbor writes	Why it is different
Meta / Facebook	3 variants: headline + primary text + CTA	Conversational, scroll-stopping, benefit-first
Google Search	3 ads: headline (max 30 chars) + description (max 90 chars)	Respects the character limits — most generators don't
TikTok	3 hook captions under 150 characters	Spoken tone, pattern-interrupt openers
LinkedIn	2 posts, 100–150 words	Professional angle, no hashtag spam

And because the kit comes from one brief, you also get four social captions, 12 niche hashtags, an email (three subject lines + body) and a product description in the same generation. Regenerate any single section without redoing the whole kit.

Why generic ad copy fails — and how Brand Voice fixes it

The most common complaint about Jasper, Copy.ai and Predis.ai on G2 and Reddit is the same: the output sounds generic. Bulk generation from a bare prompt gives near-duplicate posts with minor word swaps. AdHarbor attacks that with a persistent Brand Voice: your tone, your audience, your banned words, and hooks that actually worked for you — saved in your browser and applied to every generation. Jasper charges $69 a seat a month and puts Brand Voice behind a custom Business contract; Copy.ai locks it behind a $1,000-a-month tier. Here it is free.

How much does an AI ad copy generator cost?

Anyword charges $49–$99 a month for copy with predictive scores. Jasper is $69 a seat. AdCreative.ai charges $39 for 10 download credits — about $3.90 per creative. AdHarbor charges $0: generation runs on your own free Gemini API key (free from Google AI Studio, no card), and there are no credits to buy. The trade-off is honest: AdHarbor does not do predictive performance scoring — that needs proprietary ad-spend data no free tool has. It writes the copy; you test it.

Write ad copy that converts: 5 rules the generator follows

1. One idea per ad. A variant that tries to say everything says nothing.
2. Lead with the benefit, not the feature. "40-hour burn" is a feature; "an evening that smells like calm" is a benefit.
3. Match the platform's length. Google headlines cap at 30 characters; TikTok hooks die after one line.
4. Variants must be genuinely different. Three angles — price, story, proof — not three rewordings.
5. Ban your crutch words. Put "amazing", "revolutionary" and "best in the world" in your banned list and watch the copy get specific.