Start with Tallyf when
You want a field-first document workspace with a free 8-invoice entry point, client approval links, an estimate-to-editable-invoice handoff, branded email delivery, document engagement indicators, deposits/installments/balances, and AI receipt reading.
Consider Invoice Simple when
You want its published mobile invoicing workflow, templates, online payment options, receipt/expense tracking, reporting, or text delivery capabilities. Confirm the plan and feature availability directly with Invoice Simple.
What to check before deciding
Compare the document volume you need, whether your workflow depends on accepting payments inside the product, how you handle client approvals, and which delivery and follow-up details matter on a live job.