How Mark & Julia built Papermark to $75K MRR in 1.5 years with open source
TL;DR: Papermark started when Mark tweeted about building an open-source alternative to DocSend, generating 40K views in hours. He built an MVP over the weekend and launched on Monday with 100K views. The open-source approach proved highly defensible and scalable with zero barrier to entry. The business model uses freemium (self-hosted free version) plus paid hosted version and enterprise licenses. Growth accelerated through building in public, participating in Hacktoberfest, and shipping features faster than incumbents. They reached $20K MRR in year one and $75K MRR by mid-year two, serving 30K users with 60 open-source contributors. Their tech stack includes Next.js, TypeScript, Vercel, PlanetScale, and Cursor AI. Main costs are 80% team/freelancers, 15% marketing experiments, and 5% tools.
Key Insights
- A single tweet validating demand (40K views) can de-risk building a product before writing code
- Open source creates defensibility through transparency rather than secrecy - no one needs to build a competitor when it's already free
- Building in public with open source has zero downside since there's nothing to hide, enabling natural community growth
- Community-driven R&D velocity outpaces incumbent employees through 60 contributors monitoring and adding features
- Participating in open-source events like Hacktoberfest accelerated growth by creating a shipping cycle that showcased velocity vs sleeping incumbents
Actionable Takeaways
- Test demand with a public commitment tweet before building - if it gets traction, validate with a weekend MVP
- Choose open source when targeting markets with stagnant incumbents focused on enterprise (10+ year old tools)
- Build in public from day one by sharing incremental progress on Twitter and LinkedIn, even incomplete features
- Join open-source hackathons like Hacktoberfest to attract contributors and demonstrate shipping velocity
- Target niche CRM markets by simplifying complex one-size-fits-all tools for specific verticals (veterinarians, building managers)