FastStaq workbench
Free SaaS calculators and developer tools that do real work.
Model the business and generate real implementation scaffolds. Every tool is public, ungated, and runs locally in your browser.
3
finance tools
2
code generators
01 · finance
SaaS MRR Calculator
Calculate monthly recurring revenue, ARR, ARPA, and plan contribution across monthly and annual SaaS plans.
02 · finance
SaaS Pricing Calculator
Calculate a sustainable SaaS price from costs, projected customers, payment fees, and your target operating margin.
03 · finance
Stripe Fee Calculator
Estimate Stripe processing fees, net proceeds, effective rates, and the amount to charge for a target payout.
04 · developer
Stripe Webhook Generator
Generate a durable TypeScript, Express, and Prisma Stripe webhook scaffold with signature verification and retries.
05 · developer
SaaS Database Schema Generator
Generate a modular PostgreSQL and Prisma schema for auth, workspaces, billing, credits, API keys, webhooks, and audit logs.