AEO (Answer Engine Optimization) ranges from $90/month if you build it yourself, to $400/month for SaaS tools, to $15,000+/month for a full agency retainer. The price difference doesn't always match the results difference. Here's what each tier actually includes.

How much does AEO cost per month?

The short answer: $90-400/month for tools, $2,500-15,000+/month for agencies. What you pay depends on whether you want a dashboard or someone who does the work.

Here's the full pricing map:

Self-service tools

Otterly: from $49/month. Tracks ChatGPT and Perplexity, simple interface, good for solo founders doing their own monitoring.
SE Ranking Brand Radar: included in SE Ranking plans from $44/month. Focused on Google AI Overviews rather than chatbots. Good if you're already an SE Ranking customer.
Peec AI: from $99/month. Tracks 5+ engines including ChatGPT, Perplexity, Gemini, and Copilot. Better reporting than Otterly, more useful for agencies managing multiple clients.
Ahrefs Brand Radar: bundled with Ahrefs plans from $129/month. Google AI Overviews only, but the data sits inside Ahrefs so it's convenient if you're already there.

DIY pipeline (what we build) Using raw API keys and open-source tools: OpenAI API (~~$20/month at low volume), Perplexity API (~~$20/month), SerpAPI (~$50/month), n8n self-hosted (free), Google Sheets (free). Total: $90-100/month in API costs. This gives you the same raw data as the SaaS tools, without the dashboard. You build the reporting yourself.

Agency retainers

SME retainers: $2,500-5,000/month. Usually covers monitoring, monthly reporting, and content optimization.
Mid-market: $5,000-10,000/month. Adds strategy, competitor tracking, and faster reporting cadence.
Enterprise: $10,000-15,000+/month. Custom integrations, dedicated team, multi-market tracking, white-glove reporting.

According to BrightEdge's 2025 research, 68% of marketing teams now allocate a portion of their SEO budget to AI visibility. But most haven't formalized what they're measuring.

When are tools enough vs when do you need an agency?

Tools are enough when you're monitoring and reporting yourself. If you have someone in-house who can analyze data and act on it, a $99/month tool gives you what you need.

You need an agency when the monitoring is the easy part. Most businesses don't fail at tracking their AI visibility. They fail at knowing what to do about it. An agency should be earning its retainer by improving your visibility, not just measuring it.

The honest version of the agency value prop: you're paying for someone who has already figured out what moves the needle. That's worth something. But only if they can actually show you it's working.

Some questions that help clarify which tier you need:

Do you have someone in-house who can write structured content optimized for AI citation? If yes, you might only need the tool.
Do you have time to analyze results weekly and adjust your content calendar? If not, an agency saves that time.
Are you tracking 3+ competitors across multiple AI engines? At that scale, a tool might not be enough.

Can I do AEO myself without an agency?

Yes, and it's cheaper than most people think. The manual approach costs almost nothing. Query the AI engines yourself with prompts like "best [your category] in [your city]," log what comes up, and track it weekly in a spreadsheet.

The manual approach breaks down at scale. If you want to track 10 prompts across 5 engines for yourself and 3 competitors, that's 200 data points per week. You'll need either a tool or a pipeline.

The DIY pipeline approach sits between manual and SaaS. At Flowforge, our self-hosted monitoring pipeline costs $8-15/client/month in API fees. That's compared to $99-400/month for a SaaS tool covering the same engines. The trade-off is setup time: building the pipeline takes a few days the first time, but it scales cheaply.

If you're technically comfortable with tools like n8n or Make, the DIY route makes sense. If you're not, $49-99/month for Otterly or Peec AI is a reasonable shortcut.

How do you calculate ROI on AEO?

Track three things: AI visibility rate, citation rate, and brand search volume. These are the inputs that connect AEO activity to business outcomes.

AI visibility rate: the percentage of your tracked queries where your brand appears in the AI response. Baseline this in month 1. Most businesses without deliberate AEO work start at 0-15%. A reasonable 6-month target is 25-40%.

Citation rate: how often the AI engine links or attributes your website in responses. This matters differently for different engines. Perplexity cites sources by default. ChatGPT cites less frequently but includes brand names. Track them separately.

Brand search lift: as AI mentions your brand more, some users search for you directly. Monitor branded search volume in Google Search Console. This is the revenue bridge that makes AEO justify itself to CFOs.

According to Semrush's AI Content research, pages that appear in AI Overviews see 9% lower click-through rates on average, but higher conversion rates when users do click. AI visibility changes traffic patterns, not just traffic volume.

A practical ROI framework for a $2,500/month agency retainer: if your average customer is worth $5,000/year, you need one new customer every 60 days from improved AI visibility to break even. That's a measurable target. Most agencies won't give you this math upfront. Ask for it.

Is AEO worth it for small businesses?

Yes, but only if you're in a category people ask AI about. AEO has a higher payoff for service businesses, professional services, software tools, and anything people research before buying. It has a lower payoff for commodities and impulse purchases.

The shift is real. SparkToro and Datos found that in late 2024, roughly 1 in 3 Google searches showed an AI Overview. That number has grown since. Businesses that wait until 2027 to start tracking AI visibility will be two years behind.

Starting with the tool tier ($49-99/month) to understand your baseline before committing to an agency is a sensible approach. Run it for 60-90 days. If your visibility is low and the category matters to you, that's the signal to invest more.

The businesses getting the most value from AEO right now aren't the biggest spenders. They're the ones who started early, measured consistently, and built content with AI citation in mind from the start.

Flowforge Labs runs a self-hosted AEO monitoring pipeline for clients across Singapore and Southeast Asia. If you want to understand your current AI visibility before deciding what to spend, the free AI audit is a good starting point.