The GEO tool that tells you what to change
Nenn asks your customers' questions in ChatGPT, Perplexity and Google AI Overviews. It shows where AI skips your company and drafts the fixes, on your site and off it.
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Nenn suggestions
Refresh- Fix the wrong Fernhook price2 answers say a wrong price.30 min ago
- Get named on sites AI quotes4 cited sites name other apps.45 min ago
- Add FAQ schema to /pricingThe pricing page has no schema.2 h ago
See all suggestions
Right price in AI answers
0 of 21 of 2measured at the next check
How much does Fernhook cost?
Fernhook costs 12 euros per user a month. There is no setup fee.
Every plan has unlimited invoices and client portals. You can change it any month.
- Price per user: 12 euros a month
- Setup fee: none
- Client portals: on every plan
Can I cancel at any time?
Yes. You pay per user for each month you use Fernhook. Cancel in Settings.
Do client portals cost extra?
No. Every plan has client portals for all your clients.
What is a GEO tool?
A GEO tool shows how ChatGPT, Perplexity and Google AI answer your customers, and what to change. Nenn (nenn.io) finds the gap every week and drafts the fix.
What GEO stands for
A GEO tool is software that shows how AI engines answer your customers' questions and what to change so they name and cite your company. Nenn (nenn.io) is a GEO tool. Every week it asks those questions in ChatGPT, Perplexity and Google AI Overviews, finds the gaps and drafts the fixes.
GEO stands for generative engine optimization.
A generative engine is an AI that writes one answer instead of a list of links. ChatGPT, Perplexity and Google AI Overviews work this way.
The term comes from a research paper by a team led from Princeton University. It was first posted in November 2023 and shown at the KDD conference in 2024.
You may also read AEO (answer engine optimization) or LLM SEO. The goal is the same: AI should use your company and your pages in its answer.
How is GEO different from SEO?
SEO works for a place in a list of links. GEO works for a mention inside one written answer, where AI often names only a few companies.
| SEOGoogle search | GEOChatGPTPerplexityGoogle AI | |
|---|---|---|
| Where you show up | A list of links on a results page | Inside one answer that AI writes |
| How people ask | A few search words | Long questions with a need, a team size or a place |
| What you measure | Position and clicks | Named or not, who is named instead, which sites are cited |
| What wins | Pages that rank for a search word | Pages AI can read, trust and quote for a question |
| Off your website | Links from other sites | Mentions on the sites AI cites |
| How it moves | Rankings change slowly | The answer can change from one run to the next |
Where GEO and SEO overlap
Most GEO basics are also SEO basics. Crawlers must be allowed in, text must load without JavaScript, and facts must match on every page.
Google AI Overviews sit on the Google results page, so the two meet there. Nenn counts a search with no AI Overview as not named.
On Growth and up, Nenn shows your Google clicks and positions from Search Console next to your AI numbers.
People ask AI long questions, not search words. That is why Nenn writes the questions from your website, one topic per service.
So you do not choose one or the other. A GEO tool adds the part an SEO tool cannot see: what AI says.
What does a GEO tool help you change?
Four things: how AI reads your site, your own pages, what other sites say about you and wrong facts AI repeats. Nenn sorts every task into one of these four.
Let AI read your site
What NennBot reads on your site
Get mentioned elsewhere
Which sites AI cites for your topicsSources
24 cited domains · 3 engines · Last 7 days
- 1.ledgerly.example31
- 2.invoice-guide.example25
- 3.app-reviews.example19
- 4.billwise.example16
- 5.freelance-weekly.example12
- 6.accounting-forum.example10
- 7.quillpay.example8
- -fernhook.exampleYours0Not cited
Fix wrong facts AI repeats
What to do when AI says something wrongNenn never sends a note and never contacts anybody. You decide what goes out.
Invented companies in the Nenn app.
How the four kinds of work fit together
In the app, the Actions board has four columns, one for each kind of work.
Each task moves from New to Planned, In progress and Done.
Tasks come from every check and every website audit, biggest gap first.
Let AI read your site: a blocked crawler or a page that is empty without JavaScript stops everything else, so these tasks often come first.
Improve your own pages: one page per customer question, with the answer in the first lines and the facts as plain text.
Get mentioned elsewhere: you get the list of sites behind answers that skip you. You decide whom to write to.
Fix wrong facts: a wrong price or feature in an answer becomes a task with the right text for your page and a short note for the site owner.
Site and page work is in your hands. Off-site work needs other site owners, so Nenn gives you the words and you send them.
Your own pages matter a lot. In our runs, pricing pages got 148 of 366 citations, more than any other page type (OpenAI model via Codex CLI with web search, not the ChatGPT app, 01-02.11.2026.)
The page types AI cited most
How does Nenn find the gap and draft the fix?
It asks AI your customers' questions every week, sees who gets named and which sites get cited, then turns each gap into a task.
1. Ask the questions
Nenn reads your site and writes the questions buyers ask. Every week it asks them again on 3 AI engines.
How Nenn writes your questions
2. Spot who is named instead
A list ranks the companies AI names for your questions, with how often each one comes up.
Who AI names instead of you
3. Find the sites behind it
See which kinds of sites AI cites: your own pages, directories, reviews, media and others.
See the sites behind AI answers
4. Fix, then measure again
Approve the draft and put it live. From the next weekly check, Nenn shows what changed for that task.
How weekly tracking works
What happens between two checks
When a task is done, Nenn shows the change for it from the next check.
Until the data is there, the task says Measuring and gives the day of the next check.
Copy approved text into your site on every plan, as Markdown, HTML or text.
On Growth and up, Nenn can also publish it to WordPress, Webflow, Framer, a hosted page or a widget.
What does Nenn check on your website for AI?
Whether AI can reach and read your pages. The check takes about a minute and lists failed checks first.
What the check looks at
- AI access
- Text without JavaScript
- Structure
- Same facts everywhere
- Speed
See the 5 groups of checks
| Group | What Nenn looks at |
|---|---|
| AI access | robots.txt rules and firewalls that keep AI crawlers out, and noindex tags |
| Text without JavaScript | What a crawler sees before scripts run, on your home and service pages |
| Structure | Titles, headings, schema.org, sitemap, hreflang, canonical and llms.txt |
| Same facts everywhere | Name, address, phone and prices, stated clearly and the same on every page |
| Speed | How fast your server answers and how fast the main content loads |
Failed checks come first. Fix with Nenn starts a draft for the check you pick.
For each AI crawler, Nenn reads your robots.txt and says if it may read your pages. The list covers the crawlers of OpenAI, Perplexity, Anthropic, Google and Bing.
A firewall can block crawlers even when robots.txt lets them in. Nenn tests that too.
Our crawler, NennBot, reads robots.txt first, only reads pages and stops at 50.
The Start plan includes 4 website audits a month.
What NennBot does on your site
Which GEO work comes with each plan?
Every plan finds the gaps, writes the drafts and lets you copy them. One-click publishing and Search Console come with Growth and up.
Every plan
Weekly checks on 3 AI engines, the to-do list, website checks, drafts in 5 formats and copy as Markdown, HTML or text.
Growth and up
One-click publishing to WordPress, Webflow, Framer, a hosted page or a widget, and Search Console next to your AI numbers.
See plans and limits
See the plan table
| What you do | Start | Growth and up |
|---|---|---|
| Weekly checks on ChatGPT, Perplexity and Google AI Overviews | Yes | Yes |
| To-do list, biggest gap first | Yes | Yes |
| Website check for AI | 4 a month | Yes |
| Drafts in 5 formats, claims marked | Yes | Yes |
| Correction and guest-post notes (you send them) | Yes | Yes |
| Copy as Markdown, HTML or text | Yes | Yes |
| One-click publishing | No | Yes |
| Search Console next to AI | No | Yes |
Weekly checks and website checks use no credits.
Drafts use Nenn credits from your plan: 25 for an article, 20 for a rewrite. When credits run out, the work waits and nothing extra is charged.
The 7-day trial gives you 1 website, 2 check runs and 3 articles.
Can a GEO tool get your company named by AI?
No tool can promise that, and nobody controls what AI writes. A GEO tool shows the gap, helps you fix it and measures what changed.
Why AI answers differ from person to person
Nenn asks AI from the country you choose, in its language.
Past chats and the place a person asks from can change the words they get.
Some Google searches show no AI Overview at all. Nenn then counts the question as not named.
So read the numbers as a weekly sample, not as what every buyer sees.
Where do the facts on this page come from?
From the Nenn app itself, checked on 2 November 2026, and from our own test runs with an AI model.
See the sources
Nenn product facts
Engines, website checks, tasks, templates and plan limits, taken from the Nenn app on 02.11.2026.
Nenn research run, 115 runs, 13 questions
OpenAI model via Codex CLI with web search, not the ChatGPT app, 01-02.11.2026. Checked 02.11.2026.
GEO: Generative Engine Optimization
Aggarwal and others, arXiv 2311.09735, first posted 16.11.2023, KDD 2024. Their study, not ours. Checked 03.11.2026.
Questions about GEO tools
Does a GEO tool work for a website in German?
With Nenn, yes. Nenn asks AI from the country you choose, in its language, so questions for Germany go out in German. The app, its e-mails and Nenn's replies come in English and German.
Which GEO work should I do first?
Start with access. If AI crawlers cannot read your site, a better page will not be read either. Then answer the questions where AI names others. Nenn ranks every task by impact, so the biggest gap sits at the top.
Can I do GEO without changing my website?
Partly. Getting mentioned on the sites AI cites happens on other websites. But many gaps need a clear page on your own site. Nenn drafts that page, and you approve it before it goes anywhere.
Can I see GEO work next to my Google numbers?
Yes, on Growth and up. Connect Search Console, and Nenn puts your Google clicks and positions beside the AI numbers. So you see both sides of one change in one place.
Do GEO fixes clash with my SEO?
Usually not. Letting crawlers in, text that loads without JavaScript, clear titles and the same facts on every page help both. Nenn writes short pages for real customer questions, and you approve each one.
Do I need a GEO agency, or is a tool enough?
That depends on your time. Nenn finds the gaps, ranks them and drafts the fixes, so your own team can do the work. Agencies can use Nenn for clients too: agency plans cover 5, 15 or unlimited client brands.
See what to change for your own questions
Start the trial, add your website and get your first GEO tasks.
Card needed. Cancel before day 7 and nothing is charged.
Keep reading
Three pages that go deeper into checking and fixing your AI visibility.