Marcel Santilli

BIG NEWS: We just launched CheckThat[.]ai Buyer Intent + Free AEO Platform + Shared Prompt Library No cold start. Historical data included. --- "Seriously!? Yet another AEO tool?" I get it. I felt the same way. But I'm convinced the AEO category is fundamentally broken. Not the tools themselves. The assumption behind ALL of them: That tracking = improving. It DOES NOT. Google Analytics doesn't grow your traffic. An AEO subscription doesn't grow your AI visibility. What actually happens: Sign up → bad context → random prompts → zero data → $500-$3K/mo invoice. For prompts you're not even confident in. --- We took the complete OPPOSITE approach with CheckThat: We did the heavy lifting before you show up: → Top B2B software categories mapped → 5,800+ brands researched (and growing) → Millions of AI responses tracked daily → Human-reviewed prompt library (shared + free) Why? Working with 100+ brands at @GrowthXAI taught us: CONTEXT is everything. Your context drives your content quality. Your content quality drives your AI visibility. You can't create great content without context. You can't get context without understanding your buyers. You can't understand your buyers without data. --- To celebrate the launch, I'm doing 50 Free AEO Audit + Strategy sessions over the next month Retweet this post & comment "checkthat" and I'll send you a DM to get scheduled.

@aferrari @etnshow @sequoia @JulienBek @GrowthXAI @danielvlopes appreciate the shoutout 💜

@etnshow @sequoia @JulienBek cc @GrowthXAI @danielvlopes @santilli It appears to be a perfect fit for this thesis.

Sequoia (@sequoia) Partner @JulienBek tells us why the next $1Trillion company will be a software company masquerading as a services firm: "Ultimately, if you look at the TAM today, for every dollar that you spend on software, $6 are spent on services". "If you sell the tools, the models are getting better and better and so you're at risk... whereas, if you sell the services, you're actually delivering outcomes." "Until now, we could really just go after the $1, but now with services first and human at the centre, we think you can capture the six".

As someone building what started as an agency (@GrowthXAI) and how it's an 8-figure ARR, 70% GM, very low burn biz with 9x ARR growth last year... I'd say the hypothesis is right but the goal is not "service" per se. It's to be able to take on the $4T annual spend that goes to agencies and labor, use service as a initial delivery mechanism to build credibility and nail delivering outcomes, then build a moat with ideally infra + data + platform + distribution (in addition to forward-deployed).

YC realized agencies are fundamentally better businesses than ~75% of venture-backed startups.

@chamath @socialcapital We have some really powerful deep research, planning and writing workflows that we use to power content for customers like Lovable, Ramp, SentinelOne, Udemy here at @GrowthXAI Would love to offer it to your team for free to help power these if you're interested.

In 2020, I hired McKinsey to teach me about the global energy transition. I learned a lot, but it cost me more than $2M. After that experience, I decided to build my own internal research project at Social Capital called Learn With Me. Over the last two years, my @socialcapital team and I systematized our process into a product that allows anyone to learn with me continuously, for a fraction of the cost of a single McKinsey report. Each Learn With Me Deep Dive represents 300+ hours of first-principles research, expert interviews, and truth-seeking analysis of what's happening in the world today. We have 3 main goals: 1) Educate: Break down complex topics from first principles 2) Contextualize: Show why it matters now in a shifting world 3) Analysis: Help individuals, founders, investors, and policymakers make informed decisions on their own Over the last 2 years, we’ve released 30+ Deep Dive reports across five primary themes I believe are essential to understanding the world today: Technology, Energy, Life Sciences, Economic Analysis, and Socio-Political Trends. Some of our most popular Deep Dives: - Stablecoins: Early last year, I predicted that the biggest business winner in 2025 will be dollar-denominated stablecoins and shared the research behind this thesis. - Magnificent 7: They are the undisputed winners of the internet era, with over $21T in combined market cap. We took a deeper look at each company’s products, key competitive edge, and revenue pillars. - China: We created a 3-part, 450-slide report to explore the history, governance, and both the domestic and foreign policies of one of the world’s most powerful and longest-lasting civilizations. Historically, we averaged ~1 comprehensive Deep Dive per month, delivered as a slide deck. After expanding our team, we’re looking to scale our output significantly in 2026: - 4X Deep Dives per month: You'll start to see them drop weekly instead of monthly, and we aim to raise the quality bar with each release. - Explainer Videos: We’ll be experimenting with cinematic explainer videos for our Deep Dive topics, presented by me with high-quality animations to make the research more accessible and shareable. - Community: We aim to deepen our community of curious individuals who are invested in the topics we cover with our group chat that I’m involved in, and we plan to do even more next year to cultivate digital and physical connections between our members. Price: While we’re increasing output by 4-5x, we will be keeping the price at $99/m or $999/y. Essentially, we aim to curate a community of individuals who are curious and invested in the topics we cover. Those who want to learn alongside other like-minded members and me can self-select. Deep Dives we have planned for Q1 2026: Humanoid Robotics, Autonomous Investing, Tokenization of Equities, Critical Minerals and Rare Earths, Prediction Markets, American AI Stack, Batteries, Population Collapse, Longevity and Aging, AI in Healthcare, GLP-1s, Affordable Housing, Neuralink, Autonomous Driving, California Fiscal Review, Agentic AI. We will also look to our subscribers to influence what we research in our private group chat. I invite you to come and Learn With Me here: chamath.substack.com

@SurenTraze Thanks for the support!

@santilli Congratulations on the launch of CheckThat! Your emphasis on context in AI is spot on. Data-driven insights transform visibility and content quality. It’s crucial for businesses to leverage this evolving tech for growth! 🚀

BIG NEWS: We just launched CheckThat[.]ai Buyer Intent + Free AEO Platform + Shared Prompt Library No cold start. Historical data included. --- "Seriously!? Yet another AEO tool?" I get it. I felt the same way. But I'm convinced the AEO category is fundamentally broken. Not the tools themselves. The assumption behind ALL of them: That tracking = improving. It DOES NOT. Google Analytics doesn't grow your traffic. An AEO subscription doesn't grow your AI visibility. What actually happens: Sign up → bad context → random prompts → zero data → $500-$3K/mo invoice. For prompts you're not even confident in. --- We took the complete OPPOSITE approach with CheckThat: We did the heavy lifting before you show up: → Top B2B software categories mapped → 5,800+ brands researched (and growing) → Millions of AI responses tracked daily → Human-reviewed prompt library (shared + free) Why? Working with 100+ brands at @GrowthXAI taught us: CONTEXT is everything. Your context drives your content quality. Your content quality drives your AI visibility. You can't create great content without context. You can't get context without understanding your buyers. You can't understand your buyers without data. --- To celebrate the launch, I'm doing 50 Free AEO Audit + Strategy sessions over the next month Retweet this post & comment "checkthat" and I'll send you a DM to get scheduled.

@UrMeer289 Sending DM! TYSM!

@santilli Checkthat

@Damn_coder Ty!

@santilli CheckThat.ai betting on buyer intent and historical data first feels like a more honest approach.

@alifcoder Sent you the tool! Thanks!

@santilli Checkthat

@NegociosyB dming! thanks!

@santilli checkthat

@JayBisen473370 TYSM! Sent!

@santilli checkthat 🚀 Excited to see how this changes the AEO game!

@nrqa__ Will DM! Thanks for the support

@santilli checkthat

@doctorwasif Tysm!

@santilli Finally an AEO approach focused on real context and data not just dashboards. Excited to see how CheckThat reshapes AI visibility for brands.

@allen_lattimer You got it!

@santilli checkthat

@salmakhatunn DMing you! TYSM!

@santilli The future of AEO looks promising, and CheckThat ai may play a key role.

@codeby_abir Thanks man! Just DMed you!

@santilli The AEO space is heating up, and CheckThat ai looks ready to make a real impact.

@hey_abusiddik TYSM!

@santilli Big momentum in the AEO space—eager to see how CheckThat.ai pushes things forward.

@Satoshi_km Tysm! DMing you right now!

@santilli Congrats on the launch! Love your approach to solving the context problem. Excited to see how CheckThat changes the game for AEO.

@SDaily_AI I'm glad you like it! Just DMed you!

@santilli Exciting times! It’s great to see innovation in the AEO space. wait to see how CheckThat.ai changes the game!

@keerthik24 DM sent!

@santilli Checkthat

@Umerab9 Thanks for the support! I just sent you a DM!

@santilli checkthat

@AIFrontliner DM sent!

@santilli Checkthat