For solopreneurs chasing income: Start with **Bubble** if you want to launch a revenue-generating SaaS in weeks with minimal risk. Choose **FlutterFlow** if you already do freelance development and want to charge more per project. Pick **Make** if you have existing client relationships and want to layer automation services. **Airtable** works if your network needs database solutions. **Retool** is the long-game play for enterprise contracts. The fastest money comes from FlutterFlow/Bubble app sales ($5K-$50K projects) or Make/Retool automation subscriptions ($500-$2K/month recurring). Start where your existing network and skills align.