Harpoon is financial planning and time tracking software for freelancers, consultants, and small service businesses. Users can forecast revenue, plan projects, track time, send invoices, and compare actual income against financial goals. The product is built around helping independent professionals understand whether their work pipeline supports the income they need, rather than only recording invoices after the fact. It fits audiences that teach freelancing, consulting operations, and creative business finance. The Harpoon affiliate program pays 30% commission on payments from referred customers, which suits freelancer educators, finance creators, and small business tool reviewers.