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Callr for mobile — Startup Profile
Startup

Callr for mobile

App connects to your calendar and makes calls on your behalf

Productivity & CollaborationEstimated
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About the startup

App connects to your calendar and makes calls on your behalf

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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.

Tibo stated sub-$2M ARR at sale and $6–7M later, not catalog $3.5M

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Tally's March 2024 letter is $100k MRR, not a $3M ARR stamp

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