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I shut down my AI-powered startup. What went wrong?
Hint: It wasn't the AI.
Nov 7, 2025
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Karen Spinner
112
72
22
On Halloween, I used NotebookLM to analyze my newsletter data.
Was it scary?
Oct 31, 2025
•
Karen Spinner
71
47
14
The almost 5 under 500* newsletter spotlight: Neuroscience edition
Featuring the hidden gems of Substack.
Oct 28, 2025
•
Karen Spinner
60
28
16
What 49,000 Substack articles taught me about my newsletter niche
I developed a newsletter deep dive report to help writers understand where they fit into the Substack ecosystem
Oct 25, 2025
•
Karen Spinner
94
42
19
5 under 500 newsletter spotlight: Business x technology edition
Featuring the hidden gems of Substack
Oct 17, 2025
•
Karen Spinner
68
31
8
Introducing the 5 under 500 newsletter spotlight
Featuring the hidden gems of Substack
Oct 9, 2025
•
Karen Spinner
71
49
13
I used machine learning to make sense of 39,000 Substack articles
Using semantic search and clustering algorithms to understand what's trending on Substack right now
Oct 4, 2025
•
Karen Spinner
137
78
32
Recent writings from emerging product voices
A reading list from newsletters that focus on building products and tools of all kinds
Sep 22, 2025
•
Karen Spinner
65
35
11
I created a vector database with 2K newsletters and 30K articles
It worked great on my desktop, but did it run in production?
Sep 17, 2025
•
Karen Spinner
72
35
15
I turned my newsletter digest script into an MVP
And it's ready for testing.
Aug 15, 2025
•
Karen Spinner
80
44
14
I built a tool that creates a weekly newsletter digest
I spent several hours on a prototype. Did it work?
Aug 9, 2025
•
Karen Spinner
121
78
17
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