solo-saas
Justin Duke
Buttondown
Boring, well-designed email newsletter tool that competes with Substack from a solo shop.
Revenue
$40k+ MRR
Time to build
5+ years to critical mass
Launched
2017
Location
The story
Justin built Buttondown as a nights-and-weekends project while working full time, then went full-time in 2022 after crossing $10k MRR. He publishes his revenue publicly and writes long-form essays about the craft of building a small SaaS.
Stack
Django
PostgreSQL
Reported metrics
MRR
$40k+
Team
Solo
The full build breakdown
Pro insight
Pro only
Unlock the full breakdown
Timeline, costs, revenue curve, marketing tactics with sources, growth channels, team, and lessons — all publicly-sourced.
Growth channels
Word of mouth
Writers recommend to writers
Content
Justin's own essays
Lessons
- Boring wins in newsletter tooling
- Ship polish, not features
Publications & press mentions
Live searches across the biggest tech publications, podcasts and communities covering Justin Duke.
Want to be the next case study?
Ship your product with Build on Vibe and share your story with our community.