Overview

Founded in 2010 and released under the Apache License 2.0, Arelle serves regulators, software providers, auditors, and filers working with structured business data. It is offered as a desktop application, command-line interface, Python API, Docker image, and web service. That range makes it adaptable to both individual review and automated processing, but the right setup depends on how a team deploys and extends it.

Arelle validates and processes XBRL; it does not submit reports to regulators. Organizations that need the submission step handled as part of the same product will need another tool or process.

Key features

Arelle supports XBRL 2.1, XBRL Dimensions, Inline XBRL, xBRL-JSON, and xBRL-CSV. Its filing rules cover ESMA ESEF, SEC EDGAR, US FERC, Japan EDINET, South Africa CIPC, and other national programs, with support spanning 10 jurisdictions. This breadth makes it relevant to cross-border reporting work, though teams should match the supported rules to their own filing obligations.

The Web Service API supports integration with applications such as Excel, Java, and Oracle. Combined with the command-line and Python interfaces, that gives technical teams several routes to connect validation and processing to existing workflows. The extensible plugin architecture can add custom validation and data-processing rules.

Plugin availability varies by installation. Community plugins come bundled with desktop builds and the full Docker image; Python package and source installations require users to add and configure plugins themselves. The packaged options are therefore the more straightforward starting point for teams relying on those extensions, while other deployments offer flexibility at the cost of setup work.

The Docker image supports local validation or running an HTTP service. The built-in web server has no authentication or authorization, so it is appropriate only for trusted callers—not public internet exposure or multi-tenant use. Teams needing those access controls must provide a safer surrounding deployment or choose another service.

Pricing

Arelle is free. The free plan includes the open-source XBRL platform, desktop builds, Python package, Docker image, and community plugins; there is no free trial because the product is free. The Apache License 2.0 permits an open-source deployment, while the supported interfaces allow teams to choose how to run it. No separate paid plan is needed for the stated capabilities.

This is a strong fit for organizations able to manage their own deployment and integration. The trade-off is that Arelle’s stated role stops at validation and processing, and plugin setup can fall to the user depending on the installation type.

Platforms

Official desktop builds are available for Windows, macOS, and Linux. Arelle also supports API use and self-hosted deployment, including its Docker image and web service. Those options suit teams that want to run processing in their own environment; they do not make the unauthenticated built-in server suitable for untrusted traffic.

Who it's for

Arelle is best suited to regulators, software providers, auditors, and filers who need standards-based XBRL validation and processing without a license fee, and who have the technical capacity to choose, configure, and secure a deployment. It is less suitable as a turnkey filing portal for users who need regulator submission or a public-facing service with built-in access control.

For help, the project directs users to GitHub issues, its Google Group, and support email. Problems involving Arelle embedded in third-party products should be raised with those product developers.

Pros and cons

Broad format and filing-rule coverage: support for multiple XBRL standards and 10 jurisdictions gives reporting teams a substantial validation base.
Several integration paths: desktop, command line, Python, Docker, and web service options let technical teams fit Arelle into different operating models.
No license price: the free open-source plan includes validation rules and API access.
Not a submission service: filers must handle regulator submission elsewhere.
Deployment-specific plugin work: Python package and source users must add and configure community plugins themselves.
Unsafe for untrusted web access by default: the built-in server has no authentication or authorization.

Alternatives

Regulatory Reporting Software is the broader category to explore when comparing tools for reporting workflows.

Choose Altova Regulatory Solutions if a freemium alternative with a free trial and API, self-hosted, web, and Windows platforms better fits your evaluation. Its CbC Reporting App subscription is 999.00 USD per year, billed per user per year.

FIS Data Integrity Manager is a paid, web-based alternative. Diligence XBRL Suite is another paid option, with macOS, self-hosted, web, and Windows platforms; its Fintech plan starts at 10000.00 EUR per year.

REGREP offers a freemium alternative with API and web platforms. CoreFiling Seahorse is a paid, web-based option. Reg360 is a paid web alternative with custom pricing, and Regnology Abacus360 Banking is a paid option for self-hosted or web deployment, also with custom pricing. Complyfirst Regulatory Reporting is a paid web alternative offered by custom proposal.

Verdict

Choose Arelle if you need broad XBRL validation and processing, want to avoid license costs, and can manage deployment, plugins, and security. Look elsewhere if regulator submission or a built-in authenticated public service is essential.

	Arelle	LSEG Regulatory Reporting
Free plan	Yes
Free trial	No
Paid from	Free
Platforms	api, Linux, macOS, self-hosted, Windows	Web
Free plan	Yes	No
XBRL support	Yes
Regulator submission	No	Yes
Validation rules	Yes	Yes
Deployment	on-premises	cloud
API access	Yes
Supported jurisdictions	10	8

Arelle vs LSEG Regulatory Reporting

Arelle

LSEG Regulatory Reporting