Where Wave shines
Wave is well known for free invoicing and accounting, with payroll and payments in some regions. If you mainly need free invoicing plus basic accounting, Wave is a solid, established option.
Where UseOneApp fits
UseOneApp is not just invoicing — it bundles quotes, projects, a client portal and expenses into one workspace, with the option to bring your own AI key on the Pro plan. It is for freelancers who want the whole client workflow in one place, not only the books.
Choose Wave if: You want free invoicing plus accounting and your region is supported.
Choose UseOneApp if: You want the full client workflow (quote → project → invoice) in one tool.