Sales.co
sales.co
Done-for-you cold email and AI-assisted lead generation for B2B companies, co-founded with Ryan Doyle.
$90K/mo
Newsletter Spy by Jakob Greenfeld
Data on Substack newsletters and what is growing.
Visit Newsletter Spy ↗About Newsletter Spy
Data on Substack newsletters and what is growing. Newsletter Spy is a analytics & data product built by indie maker Jakob Greenfeld, launched in 2020.
- Status
- Active
- Launched
- 2020
- Category
- Analytics & Data
- Website
- newsletterspy.io
More products by Jakob Greenfeld
F
Founder Flywheel
founderflywheel.com
Research-as-a-service newsletter for entrepreneurs.
O
Opportunities.so
opportunities.so
Newsletter of researched business opportunities and ideas for entrepreneurs.
Mini-tool serving tweet inspiration prompts; acquired by Tweet Hunter.
Data tool that analyzed what was selling on Gumroad.
Data on indie products for makers and indie investors.
Micro-SaaS surfacing early trend signals for investors, entrepreneurs and marketers.
Newsletter Spy FAQ
What is Newsletter Spy?
Newsletter Spy is a analytics & data product: Data on Substack newsletters and what is growing.
Who made Newsletter Spy?
Newsletter Spy was made by Jakob Greenfeld, Physicist turned permissionless entrepreneur, co-founder of Sales.co. It launched in 2020. Jakob Greenfeld has also built Sales.co, Founder Flywheel, Opportunities.so, What to Tweet.
Is Newsletter Spy still active?
Yes. As far as IndieMakerList knows, Newsletter Spy is still active and run by Jakob Greenfeld at newsletterspy.io.
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