ProfitWell provides subscription and SaaS metrics that are 100% accurate and absolutely free. Sign up takes 1-click, giving you access to your monthly recurring revenue, churn, lifetime value, and all of your other necessary subscription financial metrics. Integrates with Stripe, Braintree, Zuora, Chargebee, Chargify, Recurly, and others with the ProfitWell API.

All you need to build your own SaaS at one place. Covers everything right from starting it from scratch to selling it. Resources and inspirations included.