11 Best Open Source Invoicing and Billing Software

Hiba Ali

Senior Writer

Best Open Source Invoicing and Billing Software

Key Takeaways:

  1. Open-source invoicing and billing software provides a cost-effective solution for businesses of all sizes.
  2. Open-source billing and invoicing software allows you to modify, customize, and adapt the software according to your specific business needs.
  3. Open-source invoicing and billing software often provide customizable templates and automation features that streamline invoice generation, payment tracking, and reporting.

Are you a freelancer or proprietor of a small to medium-sized enterprise? If so, you must put a lot of work into your business. Every hour spent on your hard work counts, and no part of a job is so small to go uncompensated.

Looking for Invoicing and Billing Software? Check out SoftwareSuggest’s list of the best Billing Software solutions.

Using Excel spreadsheets and Word documents to create invoices can cause a lot of unnecessary frustrations, which is why we review some of the best open-source invoice solutions in this blog. You only need to compare features and choose the best open-source invoicing software that suits your business best. 
Let’s begin with the basics:

Why Do You Need Open Source Invoicing Software?

Open-source invoice software can help businesses gain an instant competitive advantage. With invoice software, businesses can generate invoices by automating the process and sending them directly to their customers via email.

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Prioritize solutions that align seamlessly with your business needs. Consider software that caters to your current invoicing requirements and offers room for scalability as your business grows. Look for options providing a user-friendly interface for effortless integration into your workflow. Thoroughly assess the software's community support and development activity – vibrant communities often indicate ongoing updates, security enhancements, and a wealth of resources for troubleshooting.

Automated invoice systems create customized invoices that look professional and streamline the invoicing process, improving the company’s financial health. It helps to prepare invoices with a professional appeal. For example, you can prepare a simple document with your word processor or a spreadsheet or create professional invoices. 

All organizations need an application that can keep track of your payment and remind you to follow up on the invoices you have already sent, which can be provided by the open source invoicing solution. Below are our picks for the best open source invoice software.

Top 11 Open Source Invoicing and Billing Software

It is important to find the best invoicing and billing software for your business. Check out our recommended top picks:

Software NamePricingFeatures
Custom pricingCreate customized professional GST & non-GST Bills & share them with your customers via WhatsApp in 3 simple clicks
FreeExport to various file formats: PDF, MS Word, Excel or just plain text
Solo: $29 (single computer license)Lets you easily manage your reports and invoices and print sales comments or messages on all the reports
Premium Business: $40 per yearThe software embeds pre-loaded data for tax (you can customize it to suit your state or country)
Advanced Edition: $69.95Seamless PayPal integration
Ninja Pro Plan: $8 per monthIntegration with 40+ payment gateway options
Basic Plan: $9.99 per monthFully customizable statements, icons, and logos for your invoices
FreeEasily prepare and send quotes to customers with a single click
FreeAvailable in 11+ languages, including French, English, Dutch, Spanish, German, Romanian, Swedish, Portuguese, Bulgarian, Italian, and Estonian.
Pro license: $5.95 per monthEnables selling of shared and reseller hosting accounts, software licenses, downloadable products, or any recurrent billing product
Custom PricingFacilitate accurate invoicing, customized invoice presentation, and flexible invoice delivery

1. myBillBook

myBillBook logo


4.8 out of 5 stars

68 Reviews

myBillBook is the best software for billing & accounting that provides a secure platform for SMB owners to digitize their day-to-day business transactions like billing, stock management, accounting, receivables/payable management, etc. 

If you’re a business owner, you can download & install it for FREE from Google Play store & grow your business 2X. This software is available for Android and desktops in 4 different languages – English, Hindi, Gujarati & Tamil.


  • Intuitive dashboard to allow business owners to streamline their operations
  • Create customized professional GST & non-GST Bills & share them with your customers via WhatsApp in 3 simple clicks
  • Automated payment reminders to help you collect payments faster
  • Track inventory on the go
  • Multi-user support available
  • 100% safe & secure environment. Data stored in best-in-class secure cloud storage
  • Provides 24*7 support for queries via chat, call or WhatsApp


  • Diamond Plan, Platinum, and Enterprise plan with custom pricing
  • Address your everyday payment issues efficiently.
  • Receive timely notifications about impending invoice due dates.
  • Expedite payment collection and dispatch tailored business communications to potential customers swiftly.
  • Utilize myBillBook, a multilingual accounting software, to seamlessly migrate data.
  • Requires approval for customer overpayments.
  • It might not be optimal for extensive enterprises with a substantial workforce.
  • Lacks the capability to generate e-way billing within the software.

2. Simple Invoices

Simple Invoices logo

Simple Invoices

5 out of 5 stars

1 Reviews

Simple Invoices is the best free open source billing software that supports the recurring generation of sales reports, regular payments, multiple customers, and various payment types. Install it yourself if you need to use it or seek help from service providers supported by the developers. 

You can use the software to send invoices, track your finances, and bill your clients. Download free invoicing software for Linux, Windows, and IOS.


  • Export to various file formats: PDF, MS Word, Excel, or just plain text
  • Can create multiple invoice types: Itemized invoices and total invoices
  • Offers different invoice templates to choose from
  • PayPal integration for prompt payment
  • Invoice templates and different layouts
  • Unlimited invoicing
  • Efficient payment tracking
  • It can be used in various languages


  • Free
  • Present your customers with impeccably designed, professional invoices for a polished impression.
  • Offers effortless setup and user-friendly operation, ensuring ease of use for all.
  • Provides extensive customization options to manage payments and tailor invoices according to your preferences.
  • Enables swift creation, emailing, and texting of polished, business-grade invoices.
  • It may offer fewer functionalities compared to alternative invoicing software solutions.
  • Exhibits constraints in integrating with external platforms beyond Zoho products and QuickBooks Online.
  • It may not be the best fit for enterprises seeking advanced automation features.

3. F-Billing

F-Billing logo


4.5 out of 5 stars

2 Reviews

F-billing is an open source billing software for service providers, businesses (small and medium-sized and freelancers. Besides, it has excellent expense tracking and cloud backup. 

Moreover, the software enjoys a simple user interface and easily creates invoices. Furthermore, the software supports multiple users. Download free billing software for small and medium-sized businesses.


  • Strong, secure, yet editable products, services, and customer database
  • Lets you easily manage your reports and invoices and print sales comments or messages on all the reports
  • Supports multi-currency
  • Banking Integration
  • Expense & Inventory Management
  • Invoice Designer


  • Free Plan
  • Solo: $29 (single computer license)
  • Pro: $39 (multiple computer license)
  • F-Billing offers seamless creation and management of recurring invoices, streamlining billing for subscription-based services.
  • The software boasts a user-friendly interface, enabling easy navigation and swift invoice generation even for users with limited technical expertise.
  • F-Billing provides robust reporting features, allowing businesses to track their financial health, monitor payment trends, and make informed decisions.
  • The software supports integration with major payment gateways, facilitating secure and efficient online transactions.
  • While suitable for small to medium-sized businesses, F-Billing might face challenges in meeting the requirements of rapidly expanding enterprises.
  • The software might fall short in terms of offering complex automation features.
  • F-Billing's reporting capabilities lack advanced analytics functionalities required by businesses with more intricate data analysis.

4. Sleek Bill

Sleek Bill logo

Sleek Bill

4.4 out of 5 stars

9 Reviews

Sleek Bill is the best free open source invoicing software offering top invoicing features that make it the ideal billing tool for freelancers and small businesses. The software is designed to provide the best possible user experience. 

Besides, it lets you generate invoices and other necessary documents in formats of your choice – Excel or PDF. Billing has three plans: a free plan allowing a maximum of 5 invoices per month, a single computer license at $25 (with unlimited invoices), and a pro version giving you multiple computer licenses at $35.


  • Easily create and send estimates to your clients for review
  • Add or edit client details from the database
  • Automatically backs up your data
  • Invoice designer
  • The software embeds pre-loaded data for tax (you can customize it to suit your state or country)
  • Paypal integration for prompt payments
  • Smart reporting


  • Free forever
  • Premium Business: $40 per year
  • Sleek Bill offers premium invoicing features that elevate your invoicing process.
  • With its user-friendly interface, navigating and utilizing the software becomes a hassle-free experience.
  • Swiftly access your invoices for quick management and reference.
  • It seamlessly integrates with your website dashboard, fostering convenient coordination.
  • The software's integration capabilities with external platforms might be constrained, potentially impacting smooth connectivity with vital business tools.
  • Certain advanced features tailored to specific business needs might be lacking, limiting overall functionality.
  • Users might encounter limitations in downloading or viewing a maximum number of invoices, affecting document access.

5. Invoice Expert

Invoice Expert logo

Invoice Expert

5 out of 5 stars

1 Reviews

Invoice Expert is a free, open-source invoicing system package for your business. The software lets you send billing estimates to your client for your approval. The software is user-friendly and can be used within 5 minutes of installation.

Invoice Expert, one of the best open source billing software, helps organizations reduce the time spent on administrative tasks and overall invoice processing time. 


  • Create invoice PDFs seamlessly
  • Seamless PayPal integration
  • The inbuilt data import wizard
  • Easily customizable invoice designs
  • Detailed reports and secure cloud-based data backup


  • Lite Edition: Free
  • Advanced Edition: $69.95
  • Invoice Expert offers an intuitive setup and user-friendly experience, making it accessible to users of varying technical backgrounds.
  • This software provides various functionalities, including invoicing, inventory management, etc.
  • Besides invoicing, the software enables users to efficiently track expenses, contributing to a more comprehensive financial overview.
  • The software allows users to personalize their invoices, catering to unique branding and business needs.
  • A drawback of Invoice Expert is the absence of the ability to generate fully customized reports.
  • Customer support needs to respond quickly, impacting issue resolution and user satisfaction.
  • Users could experience difficulties in integrating Invoice Expert with other software solutions.

6. Invoice Ninja

Invoice Ninja logo

Invoice Ninja

5 out of 5 stars

1 Reviews

InvoiceNinja is a powerful software that states invoicing as its primary function but is loaded with various features. However, the number of functionalities it provides is commendable for an open-source invoicing solution. 

With its hefty list of functionalities, InvoiceNinja should be your first preference for open-source invoicing software.


  • Integration with 40+ payment gateway options
  • Create invoice PDFs in real-time
  • Kanban boards for project management
  • Google Analytics eCommerce support
  • Professional invoice and quotation templates
  • Time tracking tools
  • Automatic currency conversions


  • Free plan
  • Ninja Pro Plan: $8 per month
  • Enterprise Plan: Starting from $12 per month
  • This payment platform presents a plethora of stunning layout options for selection.
  • With a built-in time tracker for billable hours and an expense tracker, managing tasks becomes a breeze, complemented by user-friendly features.
  • It is an open-source solution offering customization freedom, free access, customizable PDF options, and a dedicated customer portal.
  • Its strongest attributes are remarkable flexibility, robust functionality, potent integrations, etc.
  • While support is prompt, it occasionally falls short of delivering optimal efficiency, potentially impacting issue resolution.
  • An aspect to note is the need to pay for a white-label license in the self-hosted environment, which might affect certain user preferences.
  • A few minor hiccups are present in the invoice design, warranting attention for a seamless user experience.

7. Invoicely

Invoicely logo


4.5 out of 5 stars

16 Reviews

Invoicely is the perfect open source billing system for small businesses. Users can create elegant, professional, and outstanding invoices in under 60 seconds. This software will take you from the estimate to the invoice in a smooth, effortless flow. 

In addition, invoices created through Invoicely will allow payments from customers sitting anywhere in the world and any currency. They can pay directly on the invoice.


  • Convenient dashboard with an extensive activity log
  • Monthly and yearly financial snapshots
  • Send unlimited invoices
  • Customize invoices and set up recurring invoice accounts
  • Fully customizable statements, icons, and logos for your invoices
  • Automatic payment reminders
  • Multi-business support
  • Track billable hours, expenses and miles


  • Free Plan
  • Basic Plan: $9.99 per month
  • Professional Plan: $19.99 per month
  • Enterprise Plan: $29.99 per month
  • Invoicely stands out for its rich assortment of features, even within the most basic paid tier.
  • The software exhibits international versatility by accommodating various countries and currencies, catering to a global user base.
  • Invoicely takes integration to the next level by seamlessly connecting with over 100 applications.
  • The user experience with Invoicely is marked by its simplicity and adaptability, making it easy to navigate and customize according to individual needs.
  • The absence of custom branding limits the free version of Invoicely.
  • Invoicely's customization capabilities could be improved to better meet users' preferences.
  • The most budget-friendly edition of Invoicely may have restricted features, which might not fully address the needs of some users.

8. InvoicePlane

InvoicePlane logo


InvoicePlane is a self-hosted, free, open source billing software application for managing your invoices, quotes, clients, and payments. Companies built open-source invoicing software to offer a free billing, invoicing, client management, and payment tracking application. 

So far, the application has garnered over 12,000 users in over 150 countries. Download open source invoicing software for operating the software.


  • Easily customizable to make sure it fits all your needs
  • Multilingual Interface with 23+ languages
  • Easily create an invoice with one simple click
  • Customer management
  • Easily prepare and send quotes to customers with a single click
  • Makes it easy to keep track of payments
  • Integrates well with Paypal


  • Free
  • The software boasts a straightforward interface, ensuring a user-friendly experience for both beginners and seasoned users.
  • InvoicePlane empowers businesses with personalized invoice templates, enabling them to showcase their brand identity in their invoices.
  • Tracking work hours and expenses is made efficient through InvoicePlane, facilitating meticulous financial management.
  • Addressing the comprehensive needs of businesses, InvoicePlane effectively manages quotes, invoices, clients, and payments.
  • InvoicePlane's feature set might be less extensive than alternative invoicing software solutions.
  • The installation and setup of InvoicePlane could be challenging for users with limited technical know-how.
  • The range of customization options in InvoicePlane might not match the offerings of other invoicing software solutions.

9. BambooInvoice

If you are an independent contractor, BambooInvoice is one of the best free, open source billing software and online payment providers. What sets it apart is its simplicity of use. In addition, its intuitive interface allows a non-tech-savvy person to access the system easily. 

Furthermore, you can create and edit invoices while keeping track of them by client or invoice numbers you assign. It notifies you about pending invoices. If that isn’t enough, email the invoices from within the application or generate PDFs.


  • Available in 11+ languages, including French, English, Dutch, Spanish, German, Romanian, Swedish, Portuguese, Bulgarian, Italian, and Estonian. 
  • Extremely user-friendly and actively used software programs
  • Built on modern coding standards to keep things functional
  • Works with all current and standard compliant web browsers


  • Free
  • BambooInvoice is a free and open-source software solution providing cost-effective invoicing tools for businesses.
  • With its user-friendly interface, BambooInvoice offers an intuitive experience for users, even those with limited technical skills.
  • The software empowers users with customizable invoice templates, allowing businesses to reflect their branding and individual style.
  • BambooInvoice enhances productivity by enabling users to track time spent on tasks and incurred expenses.
  • It might be limited in terms of its features and functionalities.
  • The software may not offer the scalability necessary for larger enterprises with more complex invoicing needs.
  • BambooInvoice may not match the extensive offerings of other invoicing software solutions.

10. Boxbilling

Boxbilling logo


4 out of 5 stars

1 Reviews

Boxbilling is another open-source invoicing solution and client management software. It offers tons of pre-designed templates for billing, and it also gives you the option to customize it as per your preferences. The best part is even though it allows you to create an invoice in multiple currencies, you can calculate profits in your money. 

In short, it automates billing, invoicing, and product provisioning. The order automatically gets suspended if the payment is not received by the due date. An Intuitive Web 2.0 AJAX interface gives it a 100% usability score. 


  • Multi-currency support
  • Enables selling of shared and reseller hosting accounts, software licenses, downloadable products, or any recurrent billing product
  • Sends payment reminders 
  • Facilitates integrated helpdesk to communicate with clients easily.


  • Free license
  • Pro license: $5.95 per month
  • Tailored for the needs of small to medium-sized businesses, it caters to enterprises with varying scales of operation.
  • The software's capabilities extend to payment processing, invoice and order creation, and order tracking, streamlining multiple financial processes.
  • Boxbilling also offers effective management of customer support tickets.
  • The platform is particularly beneficial for small-to-midsize businesses seeking a unified solution for efficiently handling payments, invoicing, and customer service.
  • Limited customization options are available, restricting how businesses can personalize their processes.
  • The software's installation process can be complex and challenging, posing difficulties for users during initial setup.
  • Boxbilling's customer support needs major improvements.

11. jBilling

jBilling logo


4 out of 5 stars

2 Reviews

The last on our list is jBilling — an open source billing software that gives you full access to the code. In addition, you can customize the code to suit your business needs. Specially designed for small- to medium-level enterprises and agencies, it supports Windows and web app platforms. 

Moving on, jBilling gives you full control over how your invoices are calculated and presented, helping you perfect your customer touchpoint. Its template generator feature lets you design every element of your invoices. In addition, you can maintain any number of formats and easily update them from the user interface.


  • Facilitate accurate invoicing, customized invoice presentation, and flexible invoice delivery
  • Deployable on the cloud platform on-premises basis; designed for enterprise-level grade
  • Supports multiple currencies and internationalized language support
  • Automated payment collection


  • Custom Pricing
  • jBilling offers a high level of customization, allowing businesses to create invoices tailored to their brand.
  • The software supports diverse pricing models, making handling complex billing scenarios and various types of clients easier.
  • jBilling streamlines the invoicing process by automating recurring invoicing tasks, reducing manual effort, and minimizing the risk of errors in the billing process.
  • The software provides robust reporting and analytics features, giving businesses insights into invoicing performance.
  • The high level of customization and flexibility might lead to a complex initial setup.
  • Due to its rich features and customization options, jBilling can have a steep learning curve.
  • Maintaining and updating jBilling can be challenging, requiring ongoing technical support to ensure the software remains up-to-date and functional.

Bottom Line

Never let any single minute of your hard work go uncompensated. Or waste hours on end of productive time creating an invoice. Learn the art of intelligent delegation. And in this case, the invoicing software can greatly help you.

You must identify the tools and requirements required for your company to pick the best open source invoicing software. Then, your business, clients, partners, and accountants will certainly thank you for the right decision. 

Would you like to know more about invoicing solutions for your business? If you’re looking for more options, see SoftwareSuggest’s in-depth comparison guide

Frequently Asked Questions

According to our research, SimpleInvoices is the best open source billing system.

Some of the features the best open source billing software for your business must carry are the following:

  1. Creating new invoices
  2. Making customer records/ ledgers statements
  3. Numerous invoice templates
  4. Multiple currency options
  5. Tax-compliant invoices
  6. Bills receivable management

Here are a few tips to help you find the best open source billing system:

  1. Make sure your requirements are clear
  2. Check your budget
  3. Ease of use
  4. Security and protection
  5. Invoice Personalizing
  6. Integrations
  7. Scalability
  8. Customer service

Below are some of the different types of invoices for small businesses:

  1. Pro-forma Invoice
  2. Interim Invoice
  3. Final Invoice (Standard Invoice)
  4. Recurring Invoice
  5. Timesheet Invoice
  6. E-invoice

Invoicing is a crucial part of growing any business. One of the greatest benefits is that it costs nothing, and most open source invoicing systems work better than proprietary programs.

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