Key takeaways
- Brand24 is a mature social listening tool with broad web coverage but limited depth in AI search tracking -- it monitors mentions, not AI citations or prompt-level visibility.
- Mentions.so is a lightweight AI mention tracker that's quick to set up but lacks the analytical depth most growth-focused teams need.
- Promptwatch is the only one of the three built specifically for AI search visibility -- it tracks citations across 10 LLMs, identifies content gaps, and includes tools to actually fix your visibility, not just report on it.
- If your primary concern is traditional social listening and PR, Brand24 is solid. If you need to compete in AI search, neither Brand24 nor Mentions.so gets you there.
Why this comparison matters in 2026
A year ago, most marketing teams were still treating AI search visibility as a "nice to have." That's changed. ChatGPT now handles over a billion queries per day. Perplexity is the default research tool for a growing slice of B2B buyers. Google's AI Mode has pushed organic blue links further down the page. If your brand isn't being cited in AI-generated answers, you're losing consideration before a potential customer ever visits your site.
The problem is that most brand monitoring tools weren't built for this world. They were designed to catch Twitter mentions and news articles -- which still matter, but they're a different problem than "why does ChatGPT recommend my competitor instead of me?"
That's the gap this comparison is trying to close. Promptwatch, Mentions.so, and Brand24 all sit somewhere in the brand visibility space, but they solve very different problems. Getting the wrong one means paying for data you can't act on.
What each tool actually does
Brand24
Brand24 has been around since 2011 and is one of the most established social listening platforms on the market. It monitors mentions across 25 million+ sources: social media, news sites, blogs, forums, podcasts, and review sites. Its core use case is reputation management and PR -- you set up keywords, and it alerts you when those keywords appear anywhere online.
In 2025, Brand24 added some AI-adjacent features. It now surfaces mentions from AI-generated content and has basic sentiment analysis powered by its own AI layer. But here's the honest assessment: Brand24 tracks about AI, not inside AI. It can tell you when someone writes a blog post mentioning that ChatGPT recommended your competitor. It cannot tell you what ChatGPT actually says when someone asks "what's the best [your category] tool?"
For traditional brand monitoring -- press coverage, social buzz, review site activity -- Brand24 is genuinely good. For AI search visibility specifically, it's the wrong tool.
Mentions.so
Mentions.so is a newer, leaner product focused on tracking brand mentions inside AI search engines. The pitch is simple: set up your brand name, and it monitors responses from ChatGPT, Perplexity, Gemini, and a handful of other models to see when you're cited.
It's genuinely useful for a specific use case: quickly checking whether your brand shows up in AI answers at all. The setup is fast, the interface is clean, and the pricing is accessible. But it's essentially a monitoring dashboard. You see the data, and then... you're on your own. There's no content gap analysis, no guidance on what to fix, no integration with your publishing workflow. It answers "are we visible?" but not "why aren't we visible, and what do we do about it?"
For small teams or solo founders who just want a basic pulse check on AI mentions, Mentions.so makes sense. For anyone who needs to actually move the needle, it's a starting point, not a solution.
Promptwatch
Promptwatch was built from the ground up for AI search visibility -- not as a feature bolted onto an existing tool, but as the core product. It monitors brand citations across 10 AI models (ChatGPT, Claude, Perplexity, Gemini, Grok, DeepSeek, Copilot, Meta AI, Mistral, and Google AI Overviews), but the monitoring is just the entry point.
The part that separates it from the other two is what happens after you see the data. Promptwatch's Answer Gap Analysis shows you the specific prompts where competitors are being cited and you're not -- with prompt volume estimates and difficulty scores so you can prioritize. Then its built-in AI writing agent generates content designed to close those gaps, grounded in 880M+ citations analyzed across its dataset. After you publish, page-level tracking shows whether those new pages are getting cited and by which models.
It also has features neither Brand24 nor Mentions.so come close to: AI crawler logs (real-time logs of when ChatGPT, Claude, and Perplexity crawl your site), Reddit and YouTube source tracking (since AI models frequently cite these), ChatGPT Shopping tracking, and query fan-outs that show how a single prompt branches into related sub-queries.
Head-to-head comparison
| Feature | Promptwatch | Mentions.so | Brand24 |
|---|---|---|---|
| AI search monitoring (ChatGPT, Perplexity, etc.) | Yes -- 10 models | Yes -- limited models | Partial -- surface-level |
| Social/web mention tracking | No | No | Yes -- 25M+ sources |
| Content gap analysis | Yes | No | No |
| AI content generation | Yes (built-in agent) | No | No |
| AI crawler logs | Yes | No | No |
| Prompt volume & difficulty scores | Yes | No | No |
| Reddit & YouTube source tracking | Yes | No | No |
| ChatGPT Shopping tracking | Yes | No | No |
| Page-level citation tracking | Yes | No | No |
| Traffic attribution (GSC, server logs) | Yes | No | No |
| Sentiment analysis | No | No | Yes |
| PR/reputation management | No | No | Yes |
| Starting price | $99/mo | Lower tier available | ~$99/mo |
| Free trial | Yes | Yes | Yes |
| Best for | AI search optimization | Basic AI mention checks | Social listening & PR |
The core difference: monitoring vs. optimization
This is worth dwelling on because it's the crux of the decision.
Brand24 and Mentions.so are monitoring tools. They tell you what's happening. That's valuable -- you can't improve what you can't measure. But in AI search, knowing that your brand appears in 12% of relevant ChatGPT responses doesn't tell you what to do next. You still have to figure out which prompts matter, what content is missing, and how to create something that an LLM will actually cite.
Promptwatch is structured around a closed loop: find the gaps, create content to fill them, track whether it worked. Most teams using monitoring-only tools end up doing the analysis work manually -- exporting data, guessing at what content to create, and having no reliable way to attribute results back to their AI visibility efforts.
That's not a knock on Brand24 specifically. It's a genuinely different product for a genuinely different job. If you're a PR team tracking brand sentiment across social media and news, Brand24 is the right choice. If you're an SEO or growth team trying to get cited in ChatGPT responses, it's the wrong tool -- and using it for that job will leave you frustrated.
Who should use which tool
Use Brand24 if:
- Your primary goal is reputation management, PR monitoring, or social listening
- You need to track mentions across news sites, social media, forums, and review platforms
- Sentiment analysis and share-of-voice across traditional media matter to your reporting
- AI search visibility is a secondary concern, not your main focus
Use Mentions.so if:
- You want a quick, low-cost way to check whether your brand appears in AI answers
- You're early in your AI visibility journey and just need baseline data
- You don't yet have the resources for a full GEO platform
- You're comfortable doing your own analysis and content strategy work
Use Promptwatch if:
- AI search visibility is a strategic priority, not just a metric to report
- You want to understand why competitors are being cited and you're not
- You need to create content that actually gets cited -- not just track whether it happens
- You're managing multiple sites, brands, or clients
- You want to connect AI visibility to actual traffic and revenue
A note on pricing and value
Brand24's pricing starts around $99/month for its Individual plan, scaling up for larger teams. It's reasonable for what it does, though the AI search features are thin.
Mentions.so is more affordable, which makes sense given the narrower feature set. It's a good fit if budget is tight and you just need a basic monitoring layer.
Promptwatch starts at $99/month for the Essential plan (1 site, 50 prompts, 5 articles per month), $249/month for Professional (2 sites, 150 prompts, 15 articles, plus crawler logs and local tracking), and $579/month for Business (5 sites, 350 prompts, 30 articles). Agency and enterprise pricing is available on request.
The comparison isn't quite apples-to-apples because the products do different things. But if you're evaluating purely on "what does this do for my AI search visibility," Promptwatch's $99 tier delivers more actionable output than either of the other two at any price point.
What the research landscape says
Multiple roundups published in early 2026 -- including analyses from Semrush's blog and Nightwatch -- consistently separate AI visibility tools into two categories: monitoring dashboards and optimization platforms. Brand24 doesn't appear in most of these roundups at all, because it's primarily a social listening tool. Mentions.so appears as a lightweight option for basic tracking.
Promptwatch consistently appears in the "full-platform" or "leader" category -- the tools that go beyond showing you data to helping you act on it. In a comparison of 12 GEO platforms, it was the only one rated as a leader across all evaluation categories.
The bottom line
If you're comparing these three tools specifically for AI search coverage, the honest answer is that Brand24 and Mentions.so aren't really in the same category as Promptwatch. Brand24 is a social listening tool that has added some AI-adjacent features. Mentions.so is a simple AI mention tracker. Promptwatch is an AI search optimization platform.
That doesn't mean Brand24 is bad -- it's excellent at what it does. And Mentions.so has a clear use case for teams that need a quick, cheap pulse check. But if the question is "which one covers AI search best," Promptwatch wins by a significant margin, not because of marketing claims, but because it's the only one of the three that was actually designed to help you improve your position in AI search results rather than just observe it.
The brands that will win in AI search over the next few years aren't the ones with the best monitoring dashboards. They're the ones that can find the gaps, create the right content, and verify that it's working. That's what Promptwatch is built for.