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Small tools for founders chasing their first paying customers.
Quick answers to the money questions every founder asks: what you keep after fees, how many customers you need, and whether your launch links look right.
Quit-your-job calculator→
How many customers until you can quit?
Enter your salary and price. See how many paying customers you need after fees and churn, and how long it takes to get there.
What-you-keep fee calculator→
Stripe vs Paddle vs Lemon Squeezy vs Polar vs Dodo vs Gumroad
Compare what you actually keep from each sale across payment providers, including international and subscription surcharges.
Lifetime deal vs subscription→
Is a $99 lifetime deal smarter than $9/month?
Compare lifetime-deal revenue against subscription revenue with churn and cost-to-serve, and find the break-even month.
AI model cost calculator→
What does 1,000 words cost? What does each user cost?
Turn per-million-token prices into plain English: cost per 1,000 words, per request, and per user per month for your AI feature.
Link preview checker→
See how your link looks on X, LinkedIn, Slack and WhatsApp
Paste a URL to preview its social cards and get a checklist of missing or broken meta tags with fixes.