Chaser and Satago are proper products, and for the right business they work. They connect to your accounting software, load your overdue invoices, and send reminder emails on a schedule you set, from templates you write once.
Harness does the same job the other way round. It reads the ledger and the inbox overnight, works out who owes what and what was last said to them, and writes a fresh draft for each one. Then it stops. Drafts wait for you to approve, edit or skip. You can let routine reminders send on their own.
By Connor, founder of Heoka. Checked on 15 October 2026 against Chaser's email reminders, Chaser's recommended chasing times and Satago's credit control.
Harness reads the email thread with each customer before it writes, so the chase knows what was last said to them.
If you run a ledger with hundreds of small accounts, you do not want to approve anything, and a set of good templates on the right schedules is enough, a scheduled reminder tool is the right buy. That is exactly what it is for, and it does it well.
If you have tens of customers rather than hundreds, if some of them are worth too much to get a template, and if you want to see every word before it leaves, Harness is built for you. The chasing still gets done every morning. You just keep the final say.
Chaser's site says it sends automated email reminders from templates, on schedules set by due date and customer segment. Harness writes a fresh draft for each overdue invoice each morning, using the ledger and the email history with that customer, and waits for a person to approve it unless you have let that routine reminder send on its own.
Not for every business. If you have hundreds of small accounts and no time to read anything, automatic scheduled reminders are a sensible choice. It is a bad fit when a templated reminder to a long-standing client would cost you the relationship. That is the case Harness is built for.
Not at first. Every message waits in a queue until a person approves it. Once a routine reminder has a run of approvals, you can let that one stage send on its own, and put it back to asking any time. Firmer chases and final notices always wait for you.
No. Harness sits on top of Xero and reads from it. Your accounting software stays the source of truth for the ledger.
Connect Xero and your email. Tomorrow morning there is a queue of chases written in your tone, waiting for your tap. If they read like a template machine wrote them, cancel and pay nothing.