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SparkLoop — Startup Profile
Startup

SparkLoop

The first referral tool for newsletters

Marketing & ContentEstimated

About the startup

The first referral tool for newsletters.

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Retold founder accounts from startups in the same category, each linked to the original.

Story

Buffer's first paying customer arrived four days after a seven-week build

Joel Gascoigne validated Buffer with a two-page landing flow, spent seven weeks of evenings and weekends on a minimal product, launched on 30 November 2010, and recorded a first paying customer within four days.

ConvertKit's $5,020 MRR in 2015 is not the 2020 ARR clock

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Justin Duke’s 2021 review peaked at $10,105 MRR, not a $392k year

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