Cerebro: my marketing brain, on demand.
Everything I know about growing companies, written down and structured. Read it here — or plug it into Claude or ChatGPT and let them answer with my real experience inside.
First entries landing now — founding members get in early.
How it works
Three steps. No friction, nothing to install.
Join
Pick a plan and get access in under a minute.
Read in the portal
Search, filter and save entries inside your client portal.
Connect your AI
Paste your key into Claude or ChatGPT and ask them with my knowledge inside.
This is your assistant with Cerebro
How should I structure a fractional CMO engagement for a Series A B2B SaaS?
Cerebro returns Ruben's actual operating playbook: the 90-day sequencing, the three metrics that decide renewal, the pricing bands he uses, and the two failure modes that kill these engagements — with the entry it came from, so you can verify it.
search_cerebro → get_cerebro_entry → rubenlozano.me
What's inside
Every entry carries a public summary, a confidence level and a last-reviewed date. The full body is members-only.
Membership
Flat fee with AI requests included. Cancel any time.
Cerebro
- Unlimited reading in the portal
- 500 AI requests per month
- Personal key for Claude and ChatGPT
- New entries every week
Cerebro Pro
- Everything in Cerebro
- 3,000 AI requests per month
- Priority on new entries
- Direct email support
- You lead marketing and decide without a senior sparring partner
- You use Claude or ChatGPT daily and want answers with real judgement
- You prefer proven playbooks over theory
- You're paid to be right, not to read
- —You want introductory content — use the Diaries, they're free
- —You want someone to execute for you — that's consulting
- —You expect generic downloadable templates
Frequently asked questions
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