Cork
Index cards for writers — arrange, stack, and link your ideas.
About
Cork is a virtual corkboard of index cards for writers. You can place cards anywhere, stack them like sticky notes, link related thoughts with wiki-style internal links, and use kanban-style columns when you want more structure. Cards support markdown, checklists, inline images, tags, filtering, and search. Because everything is markdown underneath you can export your boards as a clean .md file in one click. Cork is free for 3 boards; paid plans from $19 a year.
Features:
- Lay cards freely on boards or organize them in kanban columns.
- Stack cards together like a real desk pile.
- Link related cards with wiki-style [[ references and backlinks.
- Write in markdown, add checklists, tags, and inline images.
- Search across boards with quick commands and filters.
- Export any board to a clean markdown file instantly.
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FounderPlaybooks.
What other founders did to grow.
2722 dispatches from hundreds of founders, pulled from the week's best podcasts.
that point of purchase is probably the most engaged your customer is ever going to be... we get pretty decent conversion rates in that 5-ish% and all of a sudden you know I have zero incremental customer acquisition costs and now I'm driving something like a hundred to $200 in lifetime value from just one pop-up
Strike while the card is out: post-purchase upsells convert at 5%
Michael runs a simple upsell immediately after a user subscribes, when the credit card is already out and intent is at its peak. At Conde Nast, a single post-purchase pop-up for a business membership tier converts at around 5% with zero additional CAC, generating $100-200 in incremental LTV per subscriber. The moment of purchase is the single highest-leverage upsell window; most apps never use it.
Your LTV of each one of those three groups are very, very different. Really find out who those locals are — who are those people that are going to come and use your app every day, every week — and find ways to measure that.
Tourists vs Locals: average LTV hides the cohort that will make your business
LTV from an average subscriber base blends three cohorts: power users (locals) who stay for years, casual users who drop off after 2-3 months, and wrong-fit users who churn in month one. Eric advises breaking cohorts and optimising product, acquisition, and fundraising narrative around locals only — because in five years, only locals remain, and they define your actual retention curve and investor story.
There's a play for whatever you're stuck on.
Read all 2722 playbooks
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