Best Unpaid Invoices in 2026

The ideal accounting software for small business owners.

Key FreshBooks features:

User-Friendly Interface Invoicing Features Time Tracking Expense Tracking

paid Free Trial $15.0 / Monthly (5 Billable Clients)

Employee Monitoring Software with Screenshots, Internet, Activity and Time Tracking.

Key Monitask features:

Time Tracking Time Tracking Reports Timesheets Screen recording

Try for free freemium $4.99 / Monthly

QuickBooks Online is a Cloud Accounting for small business that can be used on iPad, mobile phone or computer to do invoicing, billing, run reports, or even pay employees online.

Key QuickBooks Online features:

Accessibility Automatic Updates Integrations Scalability

100% free online invoicing software for small businesses.

Key Zoho Invoice features:

Client Portal Estimates Expenses management Time Tracking

free

Award-winning financial software designed for entrepreneurs.

Key Wave Financial features:

Free to Use User-Friendly Interface Integrated Payments Comprehensive Features

Never Wait For Clients To Pay You Again!

Key Simple Invoices features:

Open Source User-Friendly Interface No Cloud Dependency Multi-Language Support

Invoice Ninja is a free, open-source solution for invoicing and billing customers.

Key Invoice Ninja features:

Open Source Feature-Rich Competitive Pricing Customizable Invoices

Open Source

Full featured, invoice and estimate solution with full mobile support.

Key Invoice2go features:

User-Friendly Interface Customization Options Mobile App Accessibility Multiple Payment Options

See what's unpaid at a glance. No accounting complexity.

Key SimpleBill features:

Simple and Easy to Use Affordable Pricing GST Compliance Quick Invoice Generation

Receivly is simple invoice tracking software for small businesses.

Key Receivly features:

Streamlined Payment Collection User-Friendly Interface Automated Reminders Time Savings

Billbooks is an online invoicing software with a new user interface to send invoices quickly.

freemium $14.95 / Monthly (5 Users per organisation)

Invoicer.ai is a simple, unlimited, and intuitive online invoicing app for small businesses, freelancers, and anyone else needing invoicing.

Key Invoicer.ai features:

Unlimited invoices Unlimited estimates Unlimited clients Invoice tracking

paid Free Trial $7.99 / Monthly

FieldNudge sends automatic, polite payment reminders so small service businesses get their invoices paid — without playing debt collector.

freemium $9.0 / Monthly (unlimited)

Professional invoice maker for small businesses and freelancers.

Key Billdu features:

User-Friendly Interface Comprehensive Features Mobile App Availability Customizable Templates

freemium $3.99 / Monthly