CoreFiling Seahorse

CoreFiling Seahorse is browser-based software for creating, converting, and validating regulatory filings in XBRL, iXBRL, and XML. It best suits in-house teams and tagging partners preparing financial or other regulated reports; its conversion and rollover tools can reduce repetitive work, but accounting review remains essential.

Overview

Seahorse brings document conversion, tagging, and rule checks into a SaaS workflow. It converts annual reports and accounts from PDF, Word, Excel, or InDesign into XHTML while retaining visual design, then supports Inline XBRL reporting for mandates including ESEF, UKSEF, and UK HMRC tax returns. EPUB import is available for InDesign users.

Its scope extends beyond annual financial reports: named use cases include CRD IV, Solvency II, National Specific Templates, and Country-by-Country Reporting. CbCR reports can be created from supplied Excel templates and checked against applicable business rules. For some prudential, regulatory, and statistical reporting, CSV files and specially formatted Excel sheets can be combined with templates.

Key features

Machine learning suggests tags for report lines and attaches confidence scores, giving reviewers a way to focus attention. Seahorse can tag financial tables in one pass and supports block and nested-block tagging for notes. These tools speed up preparation, but do not remove the need for informed checking: CoreFiling says tagging requires accounting knowledge, and taxonomy extensions can make the first year especially demanding.

Validation checks filings against ESMA conformance rules and the ESEF filing manual, displaying errors and warnings as users work. The prior-year rollover carries tagging decisions into subsequent reports, reducing repeated effort after an initial filing. The combination is useful for recurring reporting, but rollover does not make first-year setup effortless.

Seahorse runs in a browser without installation. CoreFiling describes document integration in which a vendor sends files for conversion, tagging, and validation; the broader True North platform also exposes tagging and validation through APIs. The product supports XBRL, validation rules, audit trails, and API access, but does not submit filings to regulators. CoreFiling states that it holds ISO 27001 certification, and Seahorse has XBRL International Report Creation Software certification.

Pricing

Seahorse is paid software with custom pricing. Customers obtain licences, onboarding, and support through certified providers in Europe and the UK. No plan tiers or seat quotas are described, so prospective buyers should request a quote suited to their reporting scope and provider arrangement. The practical cost to weigh is not only licensing: first-year tagging and taxonomy-extension review can also require substantial accounting expertise.

Platforms

Seahorse is cloud-based and runs on the web. Its API access supports integration through the broader True North platform, while browser access avoids local installation. Regulator submission is not included.

Who it's for

Seahorse is a strong fit for in-house reporting teams and tagging partners handling recurring ESEF or UKSEF reports, especially where preserving a report’s visual design and reusing prior-year tagging matter. It also fits organisations with CbCR or named prudential and regulatory reporting needs. It is less suited to teams without accounting expertise available for tag review, or buyers seeking software that submits filings directly to regulators.

Pros and cons

• Pros: Converts common office and design-file formats while preserving report appearance, helping teams carry established layouts into XHTML.
• Pros: Confidence-scored tagging, table and notes tagging, and prior-year rollover address several recurring sources of manual work.
• Pros: In-workflow ESMA and ESEF checks surface errors and warnings before filing, and the product also supports CbCR conversion and validation.
• Cons: Tag suggestions still need accounting review; the first reporting year can be particularly work-intensive when taxonomy extensions are needed.
• Cons: Pricing is custom, and licences, onboarding, and support are arranged through certified providers in Europe and the UK.
• Cons: Seahorse does not submit reports to regulators, leaving that step outside the product.

Alternatives

For a broader comparison, see Regulatory Reporting Software.

• Arelle is the alternative to consider if a free, open-source XBRL platform with desktop, Python, Docker, and community-plugin options better suits your workflow.
• REGnosys is worth considering if you want a freemium, web- or self-hosted option centered on the open-source Rosetta DSL.
• FIS Data Integrity Manager is another paid, web-based option for regulatory reporting.
• Altova Regulatory Solutions may suit buyers looking for a free plan or trial and a CbC Reporting App subscription priced from $999 a year per user.
• Amelkis XBRL is another paid web-based option, with a custom quote and a free demo for its Amelkis Filing plan.
• Elite Reporting Platform is another paid option, with web, mobile, desktop, and self-hosted platform support.
• Finguine is an alternative with self-hosted and web options and published annual On-Premise and Enterprise plans.
• LSEG Corporate Treasury Risk is another paid web-based product, with pricing available by contacting sales.

Verdict

Choose CoreFiling Seahorse if your team prepares recurring XBRL or iXBRL regulatory reports and values design-preserving conversion, validation, and reuse of prior-year tagging. Its main advantage is a workflow spanning conversion through validation; its main caveats are the accounting review burden, especially in year one, custom pricing, and the absence of regulator submission.