Odoo includes a wide range of business modules designed to help companies manage operations from a single, integrated platform. Instead of offering one rigid system, Odoo is built around modular applications, each focused on a specific business function such as sales, accounting, inventory, manufacturing, HR, or marketing. Businesses can choose only the modules they need and expand over time as requirements grow.
This modular approach is one of the main reasons Odoo is used by companies of different sizes and industries. It allows organizations to replace multiple disconnected tools with one unified ERP system while maintaining flexibility and control.
How Odoo modules are structured
An Odoo module is a self contained business application that performs a specific function, such as managing sales orders or tracking inventory. All modules run on the same platform and share a single database, which means information flows automatically between them.
Modules are not isolated systems. For example, a sales module can connect directly with inventory, accounting, and invoicing without manual data entry. Businesses can install modules individually, configure them based on their workflows, and add new modules later without disrupting existing operations.
This structure allows companies to start small and build a complete ERP system gradually rather than committing to a full suite from the beginning.
Sales and customer management modules
Odoo includes several modules focused on managing customers, leads, and sales processes. These modules help businesses track interactions, convert leads into customers, and manage the full sales cycle.
The CRM module allows sales teams to manage leads, opportunities, and pipelines in a structured way. Sales stages can be customized to match real sales processes, improving visibility and forecasting.
The Sales module handles quotations, sales orders, pricing, and discounts. Once a sale is confirmed, it can automatically trigger inventory movements, delivery orders, and invoicing.
For recurring revenue models, the Subscriptions module helps manage subscription plans, renewals, and recurring billing. Invoicing connects sales directly to financial records, ensuring accurate and timely billing.
Together, these modules provide a complete system for managing customer relationships and revenue generation.
Accounting and finance modules
Odoo includes built-in accounting and finance modules designed to handle day to day financial operations as well as reporting and compliance needs.
The Accounting module supports general ledger management, accounts receivable and payable, bank reconciliation, tax configuration, and financial reporting. It can be configured to meet local accounting standards and tax regulations in different countries.
Expenses allows employees to submit expense claims, which can be reviewed, approved, and reimbursed while automatically updating accounting records. Invoicing handles customer invoices, vendor bills, and payment tracking, tightly integrated with sales and purchasing.
These finance modules work directly with other parts of the system, so transactions created in sales, inventory, or purchasing automatically flow into accounting without duplication.
Inventory, manufacturing, and supply chain modules
For businesses that manage physical products, Odoo offers robust inventory and supply chain modules.
The Inventory module supports stock tracking, warehouse management, barcode scanning, and multi warehouse operations. Businesses can define replenishment rules, track stock levels in real time, and manage internal transfers.
Manufacturing supports bills of materials, production orders, work centers, and production planning. It connects directly with inventory and purchasing so materials are reserved and consumed automatically during production.
The Purchase module manages supplier relationships, purchase orders, and procurement workflows. Quality and Maintenance modules support quality checks and equipment maintenance, which are especially important for manufacturing and distribution businesses.
Together, these modules help businesses manage supply chains efficiently and reduce manual coordination.
Project management and services modules
Odoo includes modules designed for service based businesses and teams managing projects, tasks, and customer support.
The Project module allows teams to plan and track projects, assign tasks, and monitor progress. Timesheets lets employees record time spent on tasks or projects, which can be used for billing or internal analysis.
Field Service supports on site service operations, including scheduling, work orders, and customer communication. Helpdesk helps manage customer support tickets, service requests, and service level agreements.
These modules integrate with accounting and invoicing, making it easier to bill clients accurately and track profitability by project or service.
Human resources modules
Odoo includes a comprehensive set of HR modules that support employee management and workforce planning.
The Employees module stores employee records, contracts, and organizational structures. Recruitment helps manage job postings, applications, and hiring workflows.
Time Off allows employees to request leave and managers to approve it based on company policies. Attendance supports time tracking for hourly or shift based employees. Appraisals supports performance reviews and employee evaluations.
For businesses that require it, Payroll modules can handle salary calculations and payroll processing, depending on regional availability and configuration.
These HR modules help centralize employee data and reduce administrative workload.
Marketing and customer engagement modules
Odoo includes marketing tools designed to help businesses communicate with customers and generate leads.
Email Marketing allows businesses to create and send email campaigns to targeted audiences. Marketing Automation supports automated campaigns based on customer behavior, such as follow ups or lead nurturing.
SMS Marketing enables text message campaigns for promotions or notifications. Social Marketing supports managing social media posts and campaigns from within the platform.
These marketing modules integrate with CRM, allowing businesses to track the full customer journey from lead generation to conversion.
Ecommerce, website, and point of sale modules
Odoo includes modules for managing online and in store sales channels.
The Website module provides tools to build and manage business websites using a visual editor. Ecommerce extends this with online store functionality, product catalogs, shopping carts, and payment processing.
Point of Sale supports retail operations, including in store transactions, receipts, and real time inventory updates. Sales made online or in store automatically update inventory and accounting records.
This integration allows businesses to manage multiple sales channels from one system without manual reconciliation.
Reporting, automation, and productivity modules
Odoo includes modules focused on reporting, automation, and productivity improvements.
Dashboards and reporting tools allow managers to view key metrics across sales, finance, inventory, and operations. Reports can be customized to match business KPIs.
Automated actions and approvals support workflow automation, reducing manual tasks and enforcing business rules. Studio allows low code customization of forms, fields, and workflows.
These modules help businesses improve efficiency and gain better visibility into performance.
Are all Odoo modules included by default?
Not all modules are installed or used by default. Odoo allows businesses to choose which modules to install based on their needs.
Licensing and availability may depend on the Odoo edition and deployment model. Businesses can start with a small set of modules and add more later as requirements evolve, which helps control cost and complexity.
Which Odoo modules does a business actually need?
The modules a business needs depend on its industry, size, and operational complexity. A small service company may start with CRM, Projects, Timesheets, and Accounting. A manufacturing business may focus on Inventory, Manufacturing, Purchase, and Accounting.
Choosing the right modules requires understanding current workflows and future plans. Many businesses work with an Odoo implementation partner to evaluate requirements, avoid unnecessary modules, and design a scalable setup.
How many modules does Odoo have?
Odoo includes dozens of core modules covering most common business functions, along with thousands of community and third party apps available through its ecosystem. This extensibility allows businesses to expand functionality beyond the standard modules when needed.
Can Odoo modules be customized or extended?
Yes. Odoo modules can be configured, extended, or customized to match specific business needs. Businesses can adjust workflows, add custom fields, build new modules, or integrate third party systems. This flexibility allows Odoo to adapt to unique requirements while remaining a unified ERP platform.
Summary
Odoo includes a comprehensive set of modules covering sales, accounting, inventory, manufacturing, projects, HR, marketing, ecommerce, and reporting. Its modular structure allows businesses to choose only what they need, integrate operations across departments, and scale the system over time. By combining flexibility, integration, and extensibility, Odoo provides a complete ERP foundation for businesses looking to manage operations efficiently in one platform.