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Artwork for Excel Blog

Excel Blog

Carl Cortright

Open source thoughts on startups and technology. Excel is a mix of consultancy and advisory and holding company for high-growth software projects. It's owned and operated by Carl Cortright.

Platform
Substack
PricingOnly free issuesPublishesDaily
Issues205SubscribersRead blog.excel.holdings

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Latest Issues

Recent posts by this newsletter. Browse the email archive.

Claude Mass Psychosis

If you or a loved one is suffering from Claude Mass Psychosis, you may be entitled to compensation.

a month ago
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Book: The Courage to be Disliked

Finished this book last week and thought others might enjoy it. It seems very self-help-y but I liked the dialog format and also the philosophical underpinning. It’s written as a discussion between a philosopher and student about happiness ...

a month ago
2
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Systems of Action and the Dominos Pizza Tracker Product Model

I’ve been thinking a lot recently about agentic systems and the shift in how we actually get work done. We’re entering a phase where AI agents aren’t just “chatbots.” They are starting to take over massive chunks of the workflows humans use...

a month ago
4
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Voice Memos

For about 6-8 months I’ve been doing a lot more long-form writing over voice memos + LLMs.

a month ago
1
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Authors

The writers behind this newsletter.

  • Carl Cortright

    Built to build. Skin in the game with scars to prove it. Owner Excel Holdings. YC S24, Coinbase alumni

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