Overview

Arelle is a free, open-source platform for validating and processing structured XBRL business data. It suits filers, auditors, regulators, and software teams that need standards-based validation or want to embed XBRL processing in their own workflows. Its breadth of interfaces and filing rules is a strong draw, but it validates and processes reports rather than submitting them to regulators.

Founded in 2010 and released under the Apache License 2.0, Arelle comes as a desktop application, command-line interface, Python API, Docker image, and web service. That range supports local work and on-premises deployments, from an individual desktop to automated or container-based workflows.

Key features

Arelle handles XBRL 2.1, XBRL Dimensions, Inline XBRL, xBRL-JSON, and xBRL-CSV. Its filing-rule support includes ESMA ESEF, SEC EDGAR, US FERC, Japan EDINET, South Africa CIPC, and other national programs, across 10 supported jurisdictions. This makes it useful to teams dealing with multiple reporting regimes; the rules help catch validation issues, but the platform does not file reports on a user’s behalf.

Validation rules and API access are included. The Web Service API can integrate with applications such as Excel, Java, and Oracle, while the plugin architecture allows custom validation and data-processing rules. Community plugins come bundled with desktop builds and the full Docker image. Python package and source installations require users to add and configure plugins separately, so those routes offer flexibility but need more setup.

The built-in web server can serve trusted callers, but has no authentication or authorization. It is not suitable for public internet exposure or multi-tenant use; organizations needing that kind of access should choose a different deployment approach.

Pricing

Arelle — 0.00 USD per free. The free, open-source plan includes the XBRL platform, desktop builds, Python package, Docker image, and community plugins. There is no free trial because the software is free. It includes validation rules and API access, with on-premises deployment, but not regulator submission. For teams with technical capacity to run and configure it, the absence of a license charge and the choice of interfaces make Arelle a practical starting point. The trade-off is that users must handle deployment and, for Python package or source installations, plugin setup themselves.

Platforms

Official desktop builds run on Windows, macOS, and Linux. Arelle also offers an API, Docker image, and self-hosted web service. The Docker image supports local validation or an HTTP service. The web service’s lack of access controls makes it appropriate only when callers are trusted and the environment is not exposed to public or multi-tenant traffic.

Who it's for

Arelle is a good fit for regulators, software providers, auditors, and filers who need to validate or process XBRL across supported filing programs, especially when they can manage an on-premises deployment or integrate through code. It is less suitable for teams seeking an all-in-one filing service or a public-facing service with built-in authentication and authorization.

For help, the project points users to GitHub issues, its Google Group, and support email. Issues arising inside third-party products should go to those product developers, a distinction that matters when Arelle is embedded in another tool.

Pros and cons

Pros: Free under Apache License 2.0, with desktop, command-line, Python, Docker, and web-service options; broad XBRL format and filing-rule coverage; extensible plugins and API integrations for custom workflows.
Cons: No regulator submission; Python package and source installations need separate plugin configuration; the built-in web server has no authentication or authorization and cannot safely serve public or multi-tenant use.

Alternatives

For a wider comparison, see Regulatory Reporting Software.

Altova Regulatory Solutions is worth considering for buyers who want a freemium product with a free trial and a priced CbC Reporting App subscription at 999.00 USD per year, billed per user, per year. It supports API, self-hosted, web, and Windows platforms.
S&P Global Cappitech Regulatory Reporting is a paid, API- and web-based option with a free trial and pricing provided on request.
REGnosys may suit teams interested in an open-source domain-modeling approach: its Rosetta DSL is open source and was released with the ISDA Common Domain Model in 2019. It also has a free Community plan and supports API, self-hosted, and web platforms.
Elite Reporting Platform is another paid option, with support across mobile, desktop, API, extension, web, and self-hosted platforms.
FIS Data Integrity Manager is a paid web-based alternative.
Reg360 is a paid web option with custom pricing available on request.
REGREP offers a freemium route, including per-use TIN validation and an annual FATCA plan.
Amelkis XBRL is a paid web-based alternative with custom quotes and a free demo.

Verdict

Choose Arelle if you need a no-cost, standards-based XBRL validator and processor, want to automate or integrate the work, and can manage your own deployment. Its strongest advantage is the combination of broad format and filing-rule support with flexible interfaces and plugins. Look elsewhere if you need regulator submission or a built-in web server suitable for public or multi-tenant access.

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

Arelle vs CoreFiling Seahorse

Arelle

CoreFiling Seahorse