What AI tools do I need for a content marketing engine?

draft content (Elephas), optimize for search (Diib), create visuals (FLUX (Black Forest Labs)), run campaigns (Common Room). That's 4 jobs; you don't need one expensive all-in-one.

How much does an AI content marketing engine stack cost per month?

Picking the cheapest paid tool for each job, about $15/mo total. 4 of 4 jobs also have a genuinely free option, so you can start at or near $0.

Can I build a content marketing engine stack for free?

Yes — every job here has a free tier, so a fully-free stack is possible (with the usual free-tier limits).

The cheapest AI tool stack for a content marketing engine

Running a content marketing engine takes 4 AI jobs. Pick the cheapest solid tool for each and the whole stack costs about $15/mo — or as little as $0 using the 4 free options. Here's the build, with each tool's honest catch.

A content engine needs four moving parts working together: drafting at volume, optimizing each piece for search, producing supporting visuals, and distributing through ads or email. The trap is paying enterprise prices for all four. This stack assembles the cheapest credible tool per role, with free options flagged.

Job	Cheapest pick	From	Free option
Draft content	Elephas AI Writing & Content	$4.99/mo	Bertha AI
Optimize for search	Diib AI SEO	$7.99/mo	AISEO
Create visuals	FLUX (Black Forest Labs) AI Image Generation	$0.03/mo	Adobe Firefly
Run campaigns	Common Room AI Marketing & Sales	$2/mo	6sense
Total to run this stack		~$15/mo (4/4 jobs free-capable)

The honest catch on each pick

Draft content: Elephas

Visit

Best for: Mac users who want an AI writing assistant that draws on their own documents and works across all their macOS apps

Watch out: Windows or Linux users, and teams needing collaborative or web-based writing workflows

No free tier — from $4.99/mo

Optimize for search: Diib

Visit

Best for: Small business owners who want simple, automated SEO health monitoring and competitor benchmarking

Watch out: Advanced SEO professionals needing detailed keyword research, content optimization, or backlink prospecting

Has a free tier

Create visuals: FLUX (Black Forest Labs)

Visit

Best for: Developers wanting cutting-edge open-weight quality with an API option for production.

Watch out: Non-technical users who want a polished consumer UI rather than models and an API.

Has a free tier

Run campaigns: Common Room

Visit

Best for: Developer-focused SaaS companies that want to convert GitHub stars, Slack members, and contributors into pipeline.

Watch out: Traditional B2B companies without a developer community or product-led-growth motion to draw signals from.

No free tier — from $2/mo

← See all AI tool stacks

Frequently asked questions

What AI tools do I need for a content marketing engine?: draft content (Elephas), optimize for search (Diib), create visuals (FLUX (Black Forest Labs)), run campaigns (Common Room). That's 4 jobs; you don't need one expensive all-in-one.
How much does an AI content marketing engine stack cost per month?: Picking the cheapest paid tool for each job, about $15/mo total. 4 of 4 jobs also have a genuinely free option, so you can start at or near $0.
Can I build a content marketing engine stack for free?: Yes — every job here has a free tier, so a fully-free stack is possible (with the usual free-tier limits).