The CARLverse: Xponent21's AI Search
Visibility & Optimization Suite
Our lab built it. Our strategists run it. You see the results.
The CARLverse is Xponent21's proprietary suite of AI visibility and optimization tools. It tracks how your brand appears across ChatGPT, Claude, Gemini, and Perplexity, then turns that data into content, optimization, and publishing decisions, all visible to you in one place. We built every tool in it ourselves, and it runs every AI optimization engagement we take on. The tools don't set your strategy. Your strategist does, with better data and more time to use it so your brand can win in AI visibility.
CARL, short for Cognitive AI Ranking Laboratory, is the research program inside Xponent21 that studies how large language models (LLMs) decide what to cite. The CARLverse is the full ecosystem of tools grounded in that research, spanning the entire process of AI visibility work. It measures where you stand, gives you a direct line to your strategist and your scope, produces content that earns citations, keeps your live site current, and publishes through a system built for how AI models actually parse content.
Because the CARLverse is proprietary, the strategy it produces is exclusive to our clients. Working with us puts all five tools to work for you.
CARL Intelligence: AI Visibility Tracking Across ChatGPT, Claude, Gemini, and Perplexity
CARL Intelligence monitors your brand across all four major AI platforms, tracking which queries surface you, which leave you out, and how that changes over time. It runs the same prompts every day, at the same time, so the trends you see are real movement rather than noise.
More than 40 companies already track their AI visibility with CARL Intelligence. Every tracked prompt teaches us more about how LLMs choose their sources. The tool gets sharper with every brand that uses it, and so does the strategy we build for you.
You can track up to 50 prompts free for 90 days, extendable to 100 prompts for six months once you talk to one of our strategists. No credit card is required. It's the same visibility data we use to build strategy for every client, and it's included at no extra cost if you're already on retainer with us.
What you get:
- Brand visibility by query, and where you rank when you do show up
- Competitor comparison: who's getting cited instead of you
- Query cluster analysis: which questions are winnable, and which aren't worth chasing
- Trend tracking: whether your visibility is moving, and in which direction
CARL AIO: Your Engagement, All in One Place
CARL AIO is where your engagement lives. It's the client dashboard behind every CARLverse tool: your AI visibility score, what's scoped and what's already used, your content in progress, and a direct line to your strategist, all in one view instead of scattered across email and reports.
You always know where you stand. Your score updates as your strategy runs, action items tell you exactly what's needed from your side and when, and you can message your strategist directly without waiting on a status call to get an answer.
What you get:
- A live AI Visibility Score, tracked against your own baseline over time
- Clear scope and contract visibility: what's included, what's been used, what's next
- A direct channel to your strategist, with response times you can count on
- One dashboard instead of a folder of disconnected reports
CARL Writes: Content Production Built for AI Citation
The usual production order is write first, optimize afterward. CARL Writes reverses it. Every piece starts from research and strategy shaped by your account strategist, informed by a standing gap analysis across your services, buyer personas, and funnel stages, so what gets written is what's actually missing, not just what's next on a content calendar. It's written in your brand voice, checked against the CARL Model, and edited by a human before you ever see it.
Our strategy-to-publish time dropped from roughly 60 days to under 30 after we brought this system online. The quality standard stayed the same.
What you get:
- Content built from research and strategy, not a generic prompt
- Brand voice enforced automatically on every piece
- A human editor reviewing before anything reaches you
- Faster turnaround without cutting the steps that make content citable
CARL Optimize: Continuous Audits of Your Live Content
CARL Optimize is built to scan your live content against the CARL Model and surface exactly what to fix and why: outdated claims, broken internal links, inconsistent terminology, and stale information AI models have started to discount.
Audits will run regularly, so every new page gets checked against everything you've already published, and existing pages get updated where they live, no redesign project required.
What you get:
- Ongoing audits against the same model that shapes your content strategy
- Every new page checked against everything you've already published
- Fixes applied where content already lives, no redesign required
- A site that improves as a whole, not just its newest pages
CARL CMS: Schema- and Entity-Based Content Management for AI Search
CARL CMS is a content management system designed around schema markup, entity structure, and the optimization logic AI models use to decide what to trust and what to cite. It's purpose-built for AI search.
It's built to attach to your existing WordPress or Lovable site. Clients will be able to see what's published, what's in review, and how each piece is scoring. The technical work happens automatically, in the background, where it belongs.
What you get:
- Schema markup and entity tagging applied automatically, no manual setup
- Visibility into what's published, what's in review, and how each piece is scoring
- A CMS built around AI citation logic, not general-purpose SEO plugins
- One system that works with the site you already have
The CARL Model: The Citation Framework Behind Every CARLverse Tool
All five tools share one core. The CARL Model is a continuously updated framework describing what makes content trustworthy to AI systems. It covers the specific signals that drive AI citation, including on-page structure, internal linking, freshness, and factual accuracy. We validated it across more than 156,000 prompt-brand citation pairs.
As AI platforms change how they weigh sources, the CARL Model updates, and every tool built on it updates too. Your strategy stays current with the rules AI systems apply today.
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