Free AI marketing tool: ad copy, captions, email and creatives — no credits, no card

Most "free" AI marketing tools are free trials with a card on file. AdHarbor is actually free: unlimited generation, no account, no card, no credits.

Every major AI marketing tool in 2026 charges for the same core job. Jasper starts at $69 per seat a month. Copy.ai jumps from $24 to $1,000 a month. Predis.ai charges $32 to $249 a month and rations every generation with credits — 1,300 on Core, 3,200 on Rise, 10,000 on Enterprise+. AdCreative.ai sells 10 download credits for $39. The pattern is the same everywhere: the tool is good, the meter is the product.

AdHarbor removes the meter. It is a static web app — no server, no accounts, no database — so there is nothing to pay for. Generation runs on your own free Gemini API key (free from Google AI Studio, no card required), straight from your browser. Your key lives only in your browser's localStorage. You get:

Ad copy — three Meta variants, three Google Search ads, three TikTok hooks, two LinkedIn posts, all written for the platform
Social captions — four ready-to-post captions in your tone, not a generic template
Hashtags — 12 niche-specific tags, not #love and #instagood
Email — three subject lines plus a full email body, from the same brief
Product descriptions — two paragraphs for your product page
Ad creatives — 20+ canvas templates with your brand kit, your photos or free stock photos, exported as PNG at exact platform sizes

What "free" actually means here

Three things most free tools hide: the trial ends, the credits run out, or the card gets charged. AdHarbor has no trial to end — there is no paid plan in v1 at all. There are no credits to run out — generation is unlimited, limited only by Google's free-tier rate limits on your own key (about 250 requests a day for Gemini 2.5 Flash). And there is no card to charge, because there is no checkout anywhere in the app.

The honest limit: AdHarbor does not do AI video, auto-posting, competitor analysis or predictive scoring. Those need servers, account connections and proprietary data. A free static app cannot honestly offer them — so instead you plan in the built-in content calendar and export captions as CSV, the calendar as an ICS file and creatives as PNGs.

How to use it in 2 minutes

Get a free Gemini API key at Google AI Studio and paste it into the Studio (it stays in your browser).
Optional but worth it: set your Brand Voice once — tone, audience, banned words, hooks that worked.
Write one brief: product, audience, offer, tone. Press Generate. Copy what you like, regenerate what you don't.
Design the visual in the Creative Studio, save the kit, and plan it in the Calendar.

Free AI marketing tool vs the paid alternatives

Tool	Price	The catch
AdHarbor	$0	No AI video, no auto-posting — export and post instead
Predis.ai	$32–$249/mo	Credit-metered; card-required 3-day trial; no email copy
Jasper	$69/seat/mo	Brand Voice behind a custom Business contract
Copy.ai	$24–$1,000/mo	Brand voice behind the $1,000 tier; Trustpilot 1.8/5 on billing
AdCreative.ai	$39–$999/mo	10 downloads for $39; video behind $249/mo

Prices: Predis.ai verified live on predis.ai/pricing, 28 Oct 2026; others from 2026 review sources. Check each vendor's live pricing page for current prices.

Try the free tool.

One brief. A full campaign kit. $0, unlimited.

Open the Studio — free