I’ve been using CarbonFin for at least 12 years. It offers unlimited levels of hierarchy while remaining light, intuitive, and durable. It synchronizes my data among all my IOS and Windows devices through the company’s servers for free. No other outliners offer the above. But I am frankly concerned about it’s business model. How does the company support itself? Is it bound to shut down its servers for lack of funds? Will it keep on supporting new IOS versions?