A free, open-source web app that always tells you what to practice next and why. Real prerequisite curriculum (not gamified levels), BPM-laddered drills, spaced review at 1/3/7/14 days. No account needed. Piano, guitar, drums.
Rebill sends smart email sequences when your customers' payments fail. Connect Stripe in 30 seconds, recover revenue on autopilot. Built for indie SaaS founders who can't justify $249/month for Churn Buster. Pricing: $19/month Starter, $59 lifetime deal.
