Is Heirloom worth it if I farm alone?

Yes, maybe most of all: Heirloom works like one more person on the farm, turning your plan into the lists you would otherwise keep in your head.

• Tasks: each planting creates its own tasks, such as sowing and transplanting, placed week by week.
• Seeds: each planting counts the seeds and transplants it needs.
• Trays: the Nursery forecasts the trays and nursery space your plan calls for.
• Harvests: Weekly harvests lists what to pick for each market or customer.

The subscription is one price for the whole farm. If help joins you later, inviting them does not change what you pay.

See How plantings create your tasks and Understand your trial and subscription.