Cost / License
- Free
- Open Source (AGPL-3.0)
Application typeApplication types
Platforms
- Mac
- Windows
- Linux
- Electron / Atom Shell
United States

Sleek Bill is described as 'Invoicing software for Mac and PC with custom templates, quick estimates, error-free calculations, auto-complete, PDF/email output, and smart reporting' and is a Invoicing software in the business & commerce category. There are more than 100 alternatives to Sleek Bill for a variety of platforms, including Web-based, iPhone, Windows, Mac and Android apps. The best Sleek Bill alternative is GnuCash, which is both free and Open Source. Other great apps like Sleek Bill are Summit Finance, Midday, Dolibarr and Invoice Ninja.

Invoicer is a free, native Mac app designed for freelancers who need a fast, offline-friendly way to create and manage professional invoices. It focuses on a clean macOS experience, making it easy to stay organized across clients, services, and business profiles.




Abak is the most flexible time and billing system in the industry. Support multiple currencies, multiple invoice formats, and dozens of rates. Abak connects your employee’s time and expenses to your invoices, your payroll and your accounting systems, automatically.



Invoice Simple is the perfect invoice maker for small business owners, contractors and freelancers needing a simple and professional mobile invoice app. Create, send and track invoices and estimates easily on your phone.



Free e-invoice management software. PEPPOL and PDF formats. Cloud-based. Keeps your workflow under control. Integrates easily with your ERP. No license fee or hidden costs. Upgrades available for automated validation and additional e-invoice formats.



The Nexonia Expenses application streamlines your employee expense reporting process so you can better manage business & travel expenses for administrators & staff.




An online fundraising platform for schools, non-profits and businesses looking to give away NFTs and enable NFT gated experiences.

OpenSourceBilling is a simple web application to create and send invoices, receive payments, manage clients and companies. It generates reports of Item sales, payments, and collected revenues. It supports multi languages and multi currencies.




InvoiceWright is an invoicing app for solo tradespeople and freelancers who bill from the job



Patriot Software provides fast, simple, and affordable SaaS accounting and payroll software for American businesses and their accountants.




Hello Invoice is a modern invoicing platform for freelancers and professionals. Create and send estimates and invoices in seconds, automate billing, accept payments, track activity, and reduce admin, allowing you to focus less on admin and more on your work.



