Yes, both Simple Invoices and Envoice offer a Free Trial.
Simple Invoices is designed for Individuals, Freelancers and Small Business.
Envoice is designed for Large Enterprises, Medium Business and Small Business.
The starting price of Envoice begins at $12/Month when Billed Yearly, while pricing details for Simple Invoices are unavailable.
Some top alternatives to Simple Invoices includes Invoice Ninja, Invoiced, Blinksale, InvoiceBerry, Invoicely, Invoice2go, Moon Invoice, Invoicebus, Billin and Refrens Invoice.
Some top alternatives to Envoice includes Invoiced, InvoiceBerry, Square Invoices, PayorCRM, Simple Invoices, Billin, InvoiceApp, GoGSTBill, PayNet and Billogram.