OpenProcurement

OpenProcurement is a free, open-source toolkit for building procurement systems, primarily for public authorities. It is best suited to organizations and developers prepared to connect platforms through an API and operate the resulting service. Its modular engine, database and auction components support custom workflows, but account security rests with the platform or operator.

Overview

The toolkit combines a Business Process Management engine, central database and API with an auction module. Frontend platforms such as eMalls and marketplaces connect to the engine through the API, and components can be used together or separately. This makes OpenProcurement a foundation for building procurement services rather than a ready-made application for buyers.

Public procurement is its primary use, though the free software may also be used to develop and sell commercial solutions. ProZorro, ProZorro.sale, MTender and RIALTO are among the projects built with it.

Key features

Workflow and auctions

The BPM engine and auction module provide the core building blocks. The e-Auction module supports English, reverse, multivariable and insider auctions based on a Dutch auction. That range gives implementers several procurement formats, while the workflow and platform still need to be assembled for the intended use.

Open data and integration

The central data structure is based on the Open Contracting Data Standard and follows the open data principle, publishing information that can be disclosed under applicable law. Platforms can interoperate with the central database through the API regardless of their programming language or other technology choices. This is useful when multiple platforms need to connect to a shared procurement system.

Hosting and security

The central database and auction module can be hosted on AWS, with SS3-compatible object storage such as OpenStack Swift required. The central database does not store registered users’ authorization data; the web platform or operator must protect account data from unauthorized access and accidental destruction or distortion. That separation gives operators responsibility for a critical security layer, so it is a poor fit for teams unable to manage account-data protection.

Pricing

OpenProcurement is free: its OpenProcurement plan costs nothing. It is open-source software, and the license terms described by the maker allow users to build and sell custom commercial solutions. There is no free trial because the toolkit is offered as free software rather than as a time-limited service.

The toolkit is designed not to restrict database size or the number of procurements conducted. This removes two usage ceilings that can constrain procurement systems, but does not make operating a service turnkey: implementers still need to provide the platform and take responsibility for account-data protection.

Platforms

OpenProcurement is available as an API, self-hosted software and a web platform. The API-based model allows frontend platforms to connect independently of their programming language or other technology specifications. AWS hosting is supported for the central database and auction module, subject to the compatible object-storage requirement.

Who it's for

Public authorities building procurement workflows are the clearest fit. Developers and organizations creating platforms can use the API and modular components to shape a custom solution, and commercial use is permitted. It is less suitable for a buyer seeking a finished procurement app or for an operator that cannot take on account security and hosting responsibilities.

Pros and cons

• Pros: Free, open-source components can be combined or used separately, including in commercial solutions, so implementers can shape a system around their workflow.
• Pros: API interoperability across technology stacks supports connections between frontend platforms and a shared central database.
• Pros: Open Contracting Data Standard foundations and legally disclosable open data support transparent procurement processes.
• Pros: The toolkit is designed without limits on database size or procurement count, avoiding built-in scale caps.
• Cons: The web platform or operator must secure account data, making security operations part of the deployment burden.
• Cons: AWS hosting requires SS3-compatible object storage, a specific infrastructure condition for teams choosing that hosting route.

Alternatives

Procurement Software is a useful starting point for comparing options across the category. Choose Tradeshift instead if a paid web and API service with a free tier capped at 30 invoices per quarter better matches the need. BetterSpend is another free, self-hosted and web option; its Self-Hosted plan has no seats or usage caps and uses the MIT License.

For a paid option, Coupa Accounts Payable supports Android, API, iOS and web. GEP SMART Contract Management supports Android, iOS and web. Ivalua Contract Management offers enterprise contract lifecycle management with custom pricing. OpenGov Accounts Payable supports API and web. Zip is a paid API and web option with pricing available by demo request. Corcentric Source-to-Pay is a paid web-based modular SaaS option for applying the solutions needed.

Verdict

Choose OpenProcurement if you need a free, extensible foundation for public procurement workflows, API-connected platforms or commercial custom solutions. Its strongest case is the combination of modular components, interoperability and no designed database-size or procurement-count limits. Look elsewhere if you need a finished purchasing application or cannot assume responsibility for platform security and hosting.