What does it really cost to track ChatGPT, Gemini and Google AI Mode?
Most teams tracking AI visibility start with three systems: ChatGPT, Gemini and Google AI Mode. Otterly.AI includes ChatGPT, Google AI Overviews, Perplexity and Microsoft Copilot in its plans and sells Gemini and Google AI Mode as paid add-ons. growResonance includes exactly those three models in every plan and tracks them daily through each model's user interface.
This comparison does the math for the same job in both tools, and is honest about where Otterly.AI is the better fit. growResonance is also open source: self-host it with your own API keys or use the hosted version.
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The short answer
- Full cost control: growResonance is open source. When you self-host, the software is free and you pay only your own API costs and server. Otterly.AI does not mention an open source offering on its website.
- ChatGPT, Gemini and Google AI Mode: growResonance Growth costs €70 per month (€60 on a 12-month term) for 150 prompts. Otterly.AI Standard plus the Gemini and Google AI Mode add-ons comes to $307 per month for 100 prompts at monthly list prices.
- Perplexity and Copilot: Otterly.AI includes both in its base plans. growResonance tracks neither today; Perplexity is coming soon.
- The smallest possible start: Otterly.AI Lite starts at $29 for 15 prompts. growResonance Start costs €25 per month (€20 on a 12-month term) for 50 prompts.
- Agencies: growResonance has dedicated agency plans with 5 or 10 client workspaces and white-label reports from €90 per month.
- From data to action: growResonance combines tracking with tasks, a technical audit and an article assistant on one platform.
Why teams choose growResonance over Otterly.AI
A base price is only part of the picture. What matters is the final bill once every model you need is switched on. Five reasons teams pick growResonance:
- Open source
- Three core models, no add-ons
- Interface-based tracking
- Tasks, not just metrics
- Built for agencies and Europe
1. Open source: your real cost is your API bill
growResonance's source code is public on GitHub under AGPL-3.0. If you self-host, the software costs nothing. You add your own API keys and pay providers directly for each query, with no growResonance surcharges or add-ons on top. Your data stays on your own infrastructure, you can check the tracking method in the code, and you are not tied to any vendor. Teams that don't want to run a server can use the hosted version, hosted in the EU in Frankfurt. The documentation describes which features are included when you self-host.
2. The three core models, no add-ons
ChatGPT, Gemini and Google AI Mode are part of every growResonance plan, from Start to the agency tiers. Nothing extra needs to be switched on for these models, so the price on the pricing page is what you pay to track all three.
3. Measured the way your customers ask
growResonance queries each model daily through its user interface, the way people see it in the browser, rather than through the API. Every answer is stored and readable, with your brand's position, the competitors mentioned and the sources cited. For ChatGPT you also see the sub-queries the model runs on the web for a question (query fan-out).
4. From metric to task
Every measurement produces prioritized tasks. The agent explains why a model leaves you out of a given answer and proposes concrete next steps. Nothing is created until you approve it, and once a task is done, growResonance shows how the affected prompts develop.
5. Built for agencies and the European market
growResonance is hosted in Frankfurt, Germany, is GDPR-compliant and includes a data processing agreement under Art. 28 GDPR in its agency plans by default. Reports carry your own brand, and support is available in German.
Must-haves: growResonance and Otterly.AI side by side
| Criterion | growResonance | Otterly.AI |
|---|---|---|
| Open source | ||
| Open source / self-hosting | Yes, source code on GitHub (AGPL-3.0), self-hosting free | No open source offering mentioned on its website |
| Models and cost | ||
| ChatGPT | all plans | all plans |
| Gemini | all plans | add-on, $9/month (Lite) to $149/month (Premium) |
| Google AI Mode | all plans | add-on, $9/month (Lite) to $149/month (Premium) |
| Google AI Overviews | not in standard plans | all plans |
| Perplexity, Microsoft Copilot | Perplexity coming soon, Copilot not included | all plans |
| Claude | coming soon | add-on, from $29/month |
| Smallest plan | Start: 50 prompts, €25/month | Lite: 15 prompts, $29/month |
| Tracking | ||
| Tracking frequency | daily | daily |
| Measurement method | the models' user interface | not stated in general on the website; Claude via API per the website |
| Query fan-out | yes, for ChatGPT | not stated on the website |
| Acting on data | ||
| Tasks and agent | yes | GEO optimization with recommendations |
| Technical / GEO audit | yes (AI bots, llms.txt, structured data, load time) | yes (crawlability, content audit) |
| Content creation | article assistant with fact check and content score | content briefs |
| API / MCP | MCP connector | public API and MCP |
| Agencies and Europe | ||
| White-label reports | agency plans | Looker Studio with branding for agency partners |
| Hosting | EU, Frankfurt | not stated on the website |
As of October 29, 2026, based on both vendors' official websites.
growResonance vs. Otterly.AI: feature comparison
Model coverage
growResonance focuses on ChatGPT, Gemini and Google AI Mode and tracks all three in every plan. Claude and Perplexity are coming soon.
According to its website, Otterly.AI covers ChatGPT, Perplexity, Google AI Overviews, Google AI Mode, Gemini and Microsoft Copilot, with Claude available via the API. ChatGPT, AI Overviews, Perplexity and Copilot are part of the base price. Overall, Otterly.AI offers the wider choice of engines but bills two of the three core models separately.
Tracking and analysis
growResonance reports visibility, share of voice, average position, a 0–100 sentiment score and your rank among all tracked brands, per model and over 7, 30 or 90 days. Sentiment shows the exact sentences that mention your brand, with the most critical ones first.
Otterly.AI's brand reports show mentions and average position for your brand against your top five competitors. Its FAQ says sentiment analysis and the referenced links are included as well.
Sources
growResonance lists every page AI models cite, at domain and page level, and classifies each source as trade press, user-generated, reference, your own site or a competitor. A filter surfaces sources where your brand is missing, so you can see where a listing or an article would have the most effect.
Otterly.AI monitors, in its own words, how your brand and website appear or disappear across the major AI search engines, including the links being cited.
Optimization and content
Content audit and article assistant
growResonance's technical audit checks whether AI bots such as GPTBot can read your site, whether an llms.txt file exists, where structured data is missing and how fast pages load, with a fix prompt for each finding. The article assistant writes articles based on AI answers and the Google top 10, with a fact check and a content score for Google and AI search. Existing pages can be improved in the same place, automatically if you want.
Otterly.AI offers crawlability checks, a content audit with predictions and content briefs that are meant to turn pages into AI sources. If your main need is briefs for an in-house editorial team, that approach fits well.
Reports and integrations
growResonance builds reports as slides, PDF or a shareable link in your logo and colors; agency plans remove the growResonance notice. Google Search Console brings classic search data next to your AI visibility; Google Analytics 4 for visits from AI services is coming soon. The MCP connector lets your AI assistant read the data directly.
Otterly.AI provides a public API for brand reports, prompts, citations and workspace data, plus MCP. Agency partners get Looker Studio reports with their own branding.
growResonance vs. Otterly.AI: pricing
| Tier | growResonance (net, EUR) | Otterly.AI (USD) |
|---|---|---|
| Self-hosting | €0 / €0, your own API keys and server, costs depend on usage | No open source offering mentioned on its website |
| Entry | Start: €25/month, €20 on 12 months, 50 prompts | Lite: $29/month, 15 prompts |
| Mid | Growth: €70/month, €60 on 12 months, 150 prompts | Standard: $189/month, 100 prompts |
| Large | Scale: €135/month, €115 on 12 months, 350 prompts, 3 brands | Premium: $489/month, 400 prompts |
| Agencies | Studio: €105/month (€90), 5 clients · Agency: €195/month (€165), 10 clients | agency partner program on Standard or Premium |
| Enterprise | usage-based, custom | from 1,000 prompts, custom |
growResonance: net prices in euros per month, cancel monthly or commit to 12 months. Otterly.AI: monthly list prices in US dollars per its pricing page, with 15% off for annual billing. As of October 29, 2026. Currencies are not converted.
Worked example: tracking ChatGPT, Gemini and Google AI Mode daily
Say you want to track exactly these three models every day. Here is how the monthly cost adds up:
| Item | growResonance Growth | Otterly.AI Standard |
|---|---|---|
| Base plan | €70 (€60 on 12 months) | $189 |
| Gemini | included | + $59 |
| Google AI Mode | included | + $59 |
| Monthly total | €70 (€60) | $307 |
| Prompts | 150 | 100 |
| Also included | – | ChatGPT, AI Overviews, Perplexity, Copilot |
Source: official pricing pages, October 29, 2026. Otterly.AI: base plan plus the Gemini and Google AI Mode add-ons at monthly prices; annual billing is 15% cheaper.
To read this fairly: for that price Otterly.AI also gives you AI Overviews, Perplexity and Copilot. If you need those engines too, the comparison is not like for like. If your focus is ChatGPT, Gemini and Google AI Mode, growResonance covers it in one plan with no extra line items.
Other costs to keep in mind
On Otterly.AI, an extra 100 prompts cost $99 per month and Claude is a separate add-on. On growResonance, each plan has a fixed quota. Failed queries are credited back, and when the quota runs out, tracking pauses until the next cycle while your data stays visible. Every plan includes unlimited seats.
What customers say about growResonance
"Finally, we can see in black and white whether ChatGPT and Gemini mention our clients." – Maximilian Boos, Managing Director, visseo medical (translated from German)
Measured for our customers: BOS Tuning, visseo medical, DUNE47.
Which tool fits which team?
growResonance is a good fit if you
- want ChatGPT, Gemini and Google AI Mode without booking add-ons,
- want to turn metrics into concrete tasks, articles and technical fixes,
- run an agency and need white-label reports across several clients,
- care about EU hosting, a DPA and support in German.
Otterly.AI is a good fit if you
- need Perplexity, Microsoft Copilot and Google AI Overviews in the base price,
- want to start with very few prompts (Lite from $29 for 15 prompts),
- mainly want content briefs for your own editorial team,
- plan to build your own analysis on a public API.
The two can also work side by side, for example Perplexity in Otterly.AI and daily interface tracking of ChatGPT, Gemini and AI Mode in growResonance.
FAQ
Is growResonance better than Otterly.AI?
That depends on which models you need. For Perplexity, Copilot and AI Overviews in the base price, Otterly.AI covers more. growResonance is the better fit if you:
- want ChatGPT, Gemini and Google AI Mode without add-ons,
- want tasks, articles and fixes generated straight from your data,
- run an agency that needs white-label reports for 5 or 10 clients,
- want to self-host the software (open source).
Why do teams choose growResonance over Otterly.AI?
- The three core models come with every plan, at no extra cost.
- The code is open and self-hosting is free.
- Agent, technical audit and article assistant turn metrics into tasks.
- Hosting in Frankfurt, a GDPR agreement on agency plans and German-speaking support.
What are the differences between Otterly.AI and growResonance?
- Models: Otterly.AI includes ChatGPT, AI Overviews, Perplexity and Copilot, with Gemini and AI Mode as add-ons. growResonance includes ChatGPT, Gemini and AI Mode.
- Entry: Otterly.AI Lite from $29 for 15 prompts; growResonance Start from €20 for 50 prompts.
- Content: content briefs at Otterly.AI; an article assistant with content score at growResonance.
- Code: growResonance is open source; Otterly.AI mentions no open source offering.
Are Gemini and Google AI Mode included in Otterly.AI?
According to Otterly.AI's pricing page, Google AI Mode and Gemini are paid add-ons. Each costs $9, $59 or $149 per month depending on the plan. The base price includes ChatGPT, Google AI Overviews, Perplexity and Microsoft Copilot. In growResonance, ChatGPT, Gemini and Google AI Mode are part of every plan.
Which AI models should I track?
It depends on where your audience asks. ChatGPT is the main starting point for most brands. Gemini and Google AI Mode show how Google presents your brand in AI answers. Perplexity and Copilot matter for specific audiences, for example in tech or Microsoft-heavy companies. The free check shows where you stand today.
What does growResonance offer agencies?
growResonance has two agency plans: Studio with 5 client workspaces from €90 and Agency with 10 client workspaces from €165 per month on a 12-month term. Both include a shared prompt pool, white-label reports without a growResonance notice, an overview of all clients and a DPA. See the agency pricing page.
Is growResonance open source?
Yes. growResonance's code is openly available on GitHub under AGPL-3.0. You can run the software yourself, see exactly how it measures and extend it. Teams without their own server can book the hosted version instead, which runs in Frankfurt and uses the same tracking method.
What does self-hosting cost?
You pay nothing for the software. Your only costs are your server and the queries that run through your own API keys with the AI providers. growResonance charges no model add-ons when you self-host. How high your API costs are depends on how many prompts and models you track and how often.
Can I use Otterly.AI and growResonance together?
Yes. Some teams use one tool for specific engines and another for daily interface tracking, tasks and reports. Use the same prompts in both so the numbers stay comparable. Running both for a few weeks shows which tool gives you the more useful data for your questions.
How does growResonance measure the AI models?
growResonance sends your prompts to ChatGPT, Gemini and Google AI Mode every day through the models' user interface, the way users see them in a browser. Each answer is saved with position, competitors, sources and sentiment and stays readable. The documentation explains the method in detail.
growResonance helps teams get seen in AI answers
If you want to track ChatGPT, Gemini and Google AI Mode, growResonance includes everything in the plan: daily interface tracking, competitors, sources, sentiment, tasks and reports. In our worked example that is €70 per month for 150 prompts, versus $307 for 100 prompts on Otterly.AI Standard with the required add-ons. Otterly.AI is the better choice if you need Perplexity, Copilot and AI Overviews in the base price or want to start with a handful of prompts. If you want full control over costs, you can run growResonance as open source software on your own server.
growResonance vs. the rest: more comparisons
- growResonance vs. Finseo
- growResonance vs. Peec AI
- growResonance vs. Profound
- growResonance vs. SE Ranking
- growResonance vs. Rankscale
Related reading
- Agency guide: GEO in 14 days: The roadmap agencies use to launch AI visibility as a new service.
- Docs: how we measure: Why growResonance tracks through the interface and what that means for your numbers.
- MCP server: Ask about your AI visibility right inside Claude or ChatGPT.
Make your brand visible in AI answers
In 30 minutes we show you which models mention your brand today and what to do next.
Sources
- Otterly.AI, website: https://otterly.ai (accessed October 29, 2026)
- Otterly.AI, pricing: https://otterly.ai/pricing (accessed October 29, 2026)
- growResonance, pricing: growresonance.ai/pricing (current price list as of October 29, 2026)
- growResonance, agency plans: growresonance.ai/pricing/agencies (accessed October 29, 2026)
- growResonance, AI visibility: growresonance.ai/ai-visibility (accessed October 29, 2026)
