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See whether Google's AI recommends your business. Paste your URL and we ask the AI the questions your customers actually ask, then show its unedited answer - including the businesses it named instead of you. Free, no signup.

Website, pricing, platforms and company facts side by side.
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| Website | opalstack.com | growl-ai.com |
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| Company | — | Startup from Japan · 1 - 9 employees · 2026 |
| Listed in |
In their own words, as submitted to SaaSHub.


No description of Opalstack yet.
What is Growl? Growl measures whether AI assistants recommend a business. Paste a URL and Growl asks Google's AI the questions a real customer in that area would ask, then shows the answer it gave — unedited, including the competitors it named instead of you. How it works Paste your website URL....
What each product offers, as listed by its team.


Possible disadvantages
An editorial look at what each product does well and who it suits.


Overall verdict
Why this product is good
Recommended for
Overall verdict
Why this product is good
Recommended for
How often each product is chosen within a category, 0–100% relative to the other.


As answered by people managing Opalstack and Growl AI.
Growl AI's answer:
Owners of small local businesses - salons, restaurants, clinics, trades - and the solo operators who do their own marketing. The common thread is that they have no way to check whether AI assistants name them when a customer asks, and no budget for a tool that starts with a sales call.
Growl AI's answer:
Next.js (React) and TypeScript with Tailwind CSS, deployed on Vercel. Supabase for data, Stripe for payments, Resend for email. The measurement itself runs on Grounding with Google Search through the Gemini API - that is deliberate, because it is the mechanism that decides what Google's AI can cite. Other LLM providers are used as fallbacks for the non-grounded analysis steps only.
Growl AI's answer:
Growl AI's answer:
Growl started as a marketing tool and became a measurement tool because of what the measurement said. Its maker spent about a year running automated social posting and generating more than a hundred AI-written articles, then read the analytics: zero sessions from social, two search visitors in thirty days. Rather than keep selling activity, the product was rebuilt around the one thing that could actually be checked - whether AI assistants name a business when a customer asks - and the failed year was published rather than hidden: https://growl-ai.com/guides/what-didnt-work
Growl AI's answer:
Most tools in this category tell you how to improve your score. Growl shows you the answer itself. Paste a URL and it asks Google's AI what a real customer in that area would ask, then puts the raw answer in front of you - which businesses were named instead of you, and which pages the AI cited as its sources. It also checks whether your own robots.txt disallows Google-Extended, because that alone removes a site from grounded results, and a zero caused by a config file should not be sold to you as a ranking problem. No signup, no email, no card.
Growl AI's answer:
Two reasons, and neither is a feature. First, you can run a real measurement of your own site before creating an account or entering a card - most tools in this category start with a sales call. Second, we publish our own numbers: we pointed Growl at its own website, it appeared in zero of ten answers, and we published that alongside a year of marketing that did not work. A tool that always flatters its owner is not a measurement.
Share your experience with using Opalstack and Growl AI. For example, how are they different and which one is better?