Answer engine optimization isn't a single task — it's a stack of four distinct activities: researching the questions buyers ask AI engines, optimizing content to answer those questions comprehensively, adding structured data so AI systems can parse your content reliably, and measuring whether any of it is working.

Each activity needs a different tool. This guide breaks them down by category, covers the best option in each, and tells you where to start if you're building an AEO practice from scratch.

AEO vs AI visibility tracking: This post covers tools that help you do AEO — research, optimize, and structure content. If you're looking for tools that track how your brand currently appears in AI search, see our AI visibility tools roundup.

1

Question Research Tools

The starting point for any AEO strategy is knowing exactly what questions buyers are asking AI engines. These tools map question patterns so you can build content that directly answers them.

AlsoAsked
Best for AEO
Visualises the "People Also Ask" question tree from Google — which is the closest public proxy for how buyers phrase questions to AI engines. Enter a seed topic and get a branching map of related questions, exportable as a CSV for content planning.
💰 Free tier + from $15/mo 🔗 alsoasked.com

Pros

  • Maps question hierarchies visually
  • Shows question clusters by intent
  • CSV export for content planning
  • Free tier covers most use cases

Cons

  • Google data, not AI engine data
  • Limited searches on free plan
  • No content editor integration
AnswerThePublic
Free tier
One of the original question research tools — scrapes Google autocomplete to surface every permutation of a question people ask around a topic. The visual "wheel" layout is dated but the underlying data is strong for identifying long-tail question patterns.
💰 Free (3 searches/day) + from $9/mo 🔗 answerthepublic.com

Pros

  • Covers who/what/when/where/why patterns
  • Free plan available
  • Good for broad topic exploration

Cons

  • Very limited on free plan
  • Less useful than AlsoAsked for AEO specifically
  • No volume data
Semrush Topic Research
Part of Semrush suite
If you already pay for Semrush, the Topic Research and Keyword Magic tools are strong for finding question-format keywords with search volume data. Filter by "questions" in Keyword Magic to surface queries starting with who/what/how/why. Not AEO-specific, but useful if Semrush is already in your stack.
💰 From $139/mo (full suite) 🔗 semrush.com

Pros

  • Search volume data included
  • Integrates with content workflow
  • Strong if you're already a Semrush user

Cons

  • Expensive as a standalone AEO tool
  • SEO-first, not AEO-native
2

Content Optimization Tools

Once you know what questions to answer, these tools help you ensure your content is comprehensive enough to be cited. AI engines tend to reference content that fully covers a topic — thin or partial answers rarely get cited.

Frase
Best for AEO content
Frase analyses the top-ranking pages for a query and shows you exactly what topics, questions, and headings they cover. It then scores your draft against this benchmark. For AEO, this is the closest thing to a content completeness checker — AI engines tend to cite content that covers the full topic, not just the headline question.
💰 From $15/mo 🔗 frase.io

Pros

  • Content scoring vs. top competitors
  • Question extraction from SERPs
  • Built-in editor with AI assist
  • Affordable entry price

Cons

  • Scores against Google results, not AI engines
  • AI writing assistant is average
  • Can push toward keyword stuffing
Clearscope
Enterprise
The gold standard for content comprehensiveness scoring. Clearscope analyses top-ranking content and grades your draft on topic coverage using a letter grade (A+ to F). The grading system is intuitive and the term recommendations are generally high quality. Pricier than Frase but more accurate on topic modelling.
💰 From $199/mo 🔗 clearscope.io

Pros

  • Best-in-class topic modelling
  • Google Docs + WordPress integration
  • High-quality term recommendations

Cons

  • Expensive for small teams
  • SEO-primary, not AEO-native
  • No question-mapping features
3

Structured Data & Schema Tools

Schema markup is one of the clearest technical signals you can send to AI engines. FAQPage, HowTo, Article, and Product schemas all help AI systems parse and cite your content accurately. These tools make it easier to implement and validate.

Google Rich Results Test
Free
The canonical tool for validating that your schema markup is correctly implemented. Paste a URL or code snippet and Google tells you exactly which rich result types it detects and any errors. Essential before publishing any page with JSON-LD schema — garbage schema is worse than none.
💰 Free 🔗 search.google.com/test/rich-results

Pros

  • Authoritative — straight from Google
  • Completely free
  • Tests live URLs and code snippets
  • Highlights errors precisely

Cons

  • Validation only — doesn't generate schema
  • No batch testing
Merkle Schema Markup Generator
Free
A free, no-code JSON-LD generator that covers all the major schema types: FAQPage, HowTo, Article, BreadcrumbList, Local Business, Product, and more. Fill in the fields, copy the generated JSON-LD, paste into your page's <head>. The fastest way to add schema without touching code.
💰 Free 🔗 technicalseo.com/tools/schema-markup-generator

Pros

  • Covers all major schema types
  • No code required
  • Free with no limits
  • Output is clean, valid JSON-LD

Cons

  • Manual — doesn't integrate with CMS
  • No validation built in (use Rich Results Test)
Yoast SEO / Rank Math
Free WordPress plugins
If your site runs WordPress, either of these plugins handles schema generation automatically — Article, BreadcrumbList, WebSite, and basic FAQ schema without any manual JSON-LD work. Yoast is more established; Rank Math generates more schema types out of the box on the free plan.
💰 Free (premium from $99/yr)

Pros

  • Automatic schema on every page
  • No manual JSON-LD needed
  • Free tiers are genuinely useful

Cons

  • WordPress only
  • Limited FAQPage schema on free tiers
4

AI Visibility Measurement

All of the above is wasted effort if you never measure whether it's working. AEO without measurement is guesswork. This is where dedicated AI visibility tools come in — they close the feedback loop.

visibilityaudit.io
Recommended
Runs structured queries across ChatGPT, Claude, and Gemini — the exact questions your buyers ask — and scores how often your brand appears, at what position, and with what sentiment. The output is a letter grade (A–F) and a per-prompt breakdown showing exactly which queries you're winning and losing, and who's beating you on each.
💰 From $5 per audit 🔗 visibilityaudit.io

Pros

  • Tests ChatGPT, Claude, and Gemini simultaneously
  • Scores by category (location, service, competitive)
  • Shows competitor visibility on each prompt
  • No monthly commitment — pay per audit

Cons

  • Measures visibility, not content quality
  • Perplexity not yet supported
Manual Testing (ChatGPT / Claude / Gemini)
Free
The most basic measurement method: open each AI engine and manually ask 10–15 questions your buyers would ask. Note whether your brand appears and in what context. Time-consuming and hard to track over time, but costs nothing and gives you a qualitative sense of where you stand before investing in a full audit.
💰 Free (ChatGPT free tier, Claude free tier)

Pros

  • Zero cost
  • Good for a quick sanity check
  • No setup required

Cons

  • Not scalable or repeatable
  • No scoring or trend tracking
  • Results vary between sessions

All Tools at a Glance

Tool Category Pricing Best for
AlsoAsked Question research Free tier Mapping question hierarchies
AnswerThePublic Question research Free (3/day) Broad topic exploration
Semrush Question research $139+/mo Existing Semrush users
Frase Content optimization $15+/mo Content completeness scoring
Clearscope Content optimization $199+/mo Enterprise content teams
Google Rich Results Test Schema validation Free Validating schema markup
Merkle Schema Generator Schema creation Free Generating JSON-LD quickly
Yoast / Rank Math Schema (WordPress) Free tier WordPress sites
visibilityaudit.io AI visibility measurement From $5 Measuring AEO results
Manual testing AI visibility measurement Free Quick sanity check

Where to Start: An AEO Tool Stack by Stage

You don't need all of these at once. Here's how to build the stack progressively:

Step 1 — Measure

Run an AI visibility audit

Find out where you currently stand before optimizing anything. Identifies the highest-impact gaps.

Step 2 — Research

Map questions with AlsoAsked

Build a list of 20–30 buyer questions your content should answer. Free tier is sufficient.

Step 3 — Structure

Add FAQPage schema

Use the Merkle generator to add JSON-LD to your key pages. Validate with Rich Results Test.

Step 4 — Optimise

Score content with Frase

Once you're publishing regularly, use Frase to ensure each piece comprehensively covers its topic.

The feedback loop that matters: Measure → identify gaps → create/optimise content → measure again. Most AEO efforts stall because teams optimise without measuring. Starting with an audit gives you a baseline to compare against.

Start with the measurement

Run an AI visibility audit to see exactly how your brand appears in ChatGPT, Claude, and Gemini today — before you optimise anything.

Run Your Audit →

Related Reading

Frequently Asked Questions

What tools do you need for answer engine optimization?
Effective AEO requires tools across four categories: question research tools (AlsoAsked, AnswerThePublic) to find what buyers ask AI engines; content optimization tools (Frase, Clearscope) to ensure comprehensive topic coverage; schema markup tools to add structured data; and AI visibility trackers like visibilityaudit.io to measure whether your AEO efforts are actually resulting in AI citations.
Is there a free AEO tool?
Yes — several AEO tools have free tiers. AlsoAsked offers free question research, Google's Rich Results Test is free for schema validation, and visibilityaudit.io lets you run an AI visibility audit to see where you currently stand before optimizing.
What is the difference between SEO tools and AEO tools?
SEO tools focus on ranking in traditional search engines like Google — tracking keyword positions, backlinks, and page authority. AEO tools focus on being cited or recommended by AI engines like ChatGPT, Claude, and Gemini. Some tools like Semrush and Ahrefs are adding AEO features, but dedicated AEO tools are purpose-built for measuring and improving AI visibility specifically.
How do I know if my AEO efforts are working?
The most direct way is to regularly run structured queries across ChatGPT, Claude, and Gemini using questions your buyers actually ask, and track whether your brand appears. An AI visibility audit tool like visibilityaudit.io automates this — running dozens of relevant queries and scoring your visibility so you can measure change over time.
Do I need all four types of AEO tools?
Not all at once. The highest-leverage starting point is measurement — find out where you stand with an AI visibility audit. Then use question research tools to identify content gaps, and schema tools to ensure your existing content is properly structured. Content optimization tools become valuable once you're consistently producing new AEO-focused content.