Best study planner for solopreneurs

There are roughly 200-300 study planning and productivity apps on the market, but fewer than 20 are specifically designed for solopreneurs or self-directed professionals. The core pain point is that existing planners (Notion templates, Todoist, standard Pomodoro apps) treat all 'studying' the same—they don't distinguish between learning a skill to scale your business versus preparing for an exam. Most solopreneurs end up Frankenstein-ing three different tools: a CRM for client work, a generic planner for daily tasks, and a learning platform for skill development. The real gap isn't in task management; it's in connective tissue between skill-building, income-producing work, and measurable progress toward business milestones. A vibecoder entering this space should focus on the business-skill intersection: tools that help solopreneurs see how a 30-minute learning session on copywriting, SEO, or design directly impacts their next client project or revenue. The secondary opportunity is batch-planning for income streams—most solopreneurs juggle 2-4 revenue sources and need visibility across all of them while learning the skills to optimize each one.