5 best apps to track customer debts for small businesses in 2025

Tracking who owes you money is one of the most important things a shop owner does. Do it badly and balances are forgotten, disputes become arguments, and cash flow suffers silently. Do it well and you always know where you stand.

This article compares five approaches — from paper to purpose-built apps — so you can choose what fits your business best.

What to look for in a debt-tracking tool

Before comparing options, here are the criteria that matter for a small shop:

• Works offline. Your internet can go down. Your shop cannot afford to.
• Fast to use on a phone. If it takes more than fifteen seconds per entry, you will not be consistent.
• Per-person balances. You need to track each client separately, not one giant total.
• Reminder system. The tool should help you follow up on overdue balances.
• Export option. When a customer disputes a balance, you need written proof.
• Security. Your business data should not be visible to anyone who picks up your phone.

1. The paper notebook

Cost: Free | Offline: Yes | Best for: Very small operations

The paper ledger has served merchants for centuries for good reason: zero cost, zero learning curve. The problems are familiar — pages get torn, ink fades, totals require mental arithmetic, and there is no way to send a reminder. For fewer than ten credit customers who pay reliably, paper still works. Beyond that, the risks outweigh the convenience.

2. Excel or Google Sheets

Cost: Free | Offline: Excel yes, Google Sheets needs internet | Best for: Owners comfortable with formulas

A spreadsheet is flexible and free. The problems: it is slow and awkward on a phone, formulas break when rows are inserted incorrectly, and there is no reminder system. Google Sheets also requires a reliable internet connection. For a shop owner on their feet serving customers all day, opening a laptop to update a cell is not realistic.

3. General accounting apps (Wave, QuickBooks, Zoho)

Cost: Free to $30/month | Offline: Limited | Best for: Businesses needing full accounting

These apps are excellent for businesses that need invoicing, VAT and bank reconciliation. They are overkill — and unnecessarily complex — for a shop that simply needs to know who owes what. Most require an internet connection and a learning curve measured in days.

4. Basic note apps (iPhone Notes, Google Keep)

Cost: Free | Offline: Yes | Best for: Absolute beginners

Better than nothing, but no balance calculation, no search by customer, no reminders, and no export. Works for one or two credits and collapses at scale.

5. Konnach — purpose-built offline ledger

Cost: Free (premium available) | Offline: 100% | Best for: Shop owners who extend credit regularly

Konnach was built specifically for the way small merchants work. You add a client or supplier, log transactions in a few taps, and the app calculates balances automatically. Key features:

• Separate client and supplier ledgers — never confuse who owes you with who you owe
• One-tap WhatsApp reminders — send a polite payment reminder without writing a word
• PIN and Face ID protection — nobody else sees your balances
• PDF and CSV export — proof of any balance in two taps
• Daily cashbook — tracks cash flow alongside your credit ledger
• Statistics screen — monthly totals and trends at a glance
• Fully offline — works anywhere, no account required

Setup takes under three minutes. You open it, add your first client and log a transaction — and that is it.

Quick comparison

| | Paper | Spreadsheet | Accounting app | Konnach | |---|---|---|---|---| | Works offline | ✓ | Partial | ✗ | ✓ | | Fast on phone | ✓ | ✗ | ✗ | ✓ | | Auto balances | ✗ | Manual | ✓ | ✓ | | Reminders | ✗ | ✗ | ✗ | ✓ | | PDF export | ✗ | Manual | ✓ | ✓ | | Free | ✓ | ✓ | Partial | ✓ |

If you extend credit to more than five customers regularly, a purpose-built ledger is the most practical choice. It does one thing extremely well — and it does it on your phone, offline, in seconds.