Stand alone accounts receivable software and simple accounts receivable software that works with the accounting system you already have

Most companies that search for stand alone accounts receivable software are not trying to leave their accounting system. QuickBooks, Xero or NetSuite already does the books well. What it does not do is the receivables work in between: noticing which invoices are about to slip, sending the second and third reminder on time, texting the customer who never opens email, reading the reply that says the invoice went to the wrong AP inbox, and matching the payment when it finally lands. A standalone AR tool takes that work off the ledger and leaves the ledger alone.

AccountsReceivable.ai is built that way. On Starter it connects to QuickBooks Online or Xero, reads every open invoice and billing contact, and runs an escalating sequence for each one: an email before the due date, a text from your own Twilio number once it is past due (sent only in the customer's daytime hours), and firmer follow-ups as it ages. Every queued message checks the live balance first, and when a payment arrives it is matched and written back against the invoice. Growth adds NetSuite, Sage Intacct, Business Central and Acumatica plus a live AI phone call for invoices that stay quiet. Starter is 299 USD a month, or 149 USD a month billed annually, with no percentage of what gets collected.

If you would rather not connect anything yet, export your open invoices or the A/R aging report as a CSV and drop it into the tool above. You get the aging, the customers most likely to pay late and the exact reminder each one would receive, in a few minutes. That is also the honest test of whether you need separate AR software at all: if the list it shows you is short and current, the reminders built into your accounting system are probably enough.