Index Data

What Index Data does

Index Data is a privately held Danish software company founded in 1994 in Copenhagen by Sebastian Hammer and Adam Dickmeiss, operating through Index Data ApS (Denmark) and Index Data LLC (Massachusetts, USA), with headquarters in Copenhagen and a regional operational hub in Boston. The company develops and supports open-source library technology platforms serving academic libraries, public libraries, special collections, research institutions, and library consortia worldwide, with a team distributed across the United States, Canada, Denmark, the United Kingdom, Sweden, Australia, and Nigeria.

The company's core technology stack centers on FOLIO, a modular open-source library services platform that Index Data originally architected and continues to develop, complemented by ReShare (community-owned resource sharing on ISO 18626), VuFind (Solr-based discovery interface), LDP powered by Metadb (community-owned analytics), CYCLOPS (collaborative collection lifecycle platform under IMLS-funded CCLP), and the MasterKey suite (Pazpar2 metasearching middleware, Metaproxy, MasterKey Enterprise/Share/Express/Connect). Supporting tools include the YAZ Z39.50 toolkit, Zebra search engine, MKWS embeddable widgets, MP-SPARQL and MP-XQuery Metaproxy modules, and language bindings (Perl, Java, PHP, C++). All products are released under open-source licenses with code contributed back to the respective communities, and Index Data is the sole certified service provider for ReShare.

Index Data monetizes primarily through FOLIO Complete SaaS hosting on AWS (bundling FOLIO, VuFind, and LDP/Metadb with 99.95% uptime guarantee and 24/7 monitoring), implementation and migration services for libraries transitioning from legacy ILS, custom development for FOLIO modules (with all code contributed back to the community), strategic consulting, and hosting/support for ReShare, VuFind, MasterKey, and CYCLOPS. Pricing is not publicly disclosed and contracts are negotiated annually. Go-to-market combines direct relationship-based outreach (email-driven inquiry at product-specific inboxes), deep community engagement through conferences (ALA, Charleston, BiblioCon, ELAG, Code4Lib, CNI), standards bodies (NISO), and the FOLIO/ReShare/VuFind open-source communities — explicitly with no traditional sales team. Notable customers include Stanford University Libraries, Duke University, University of Chicago, Linköping University, Spokane Public Library (and co-founder of the PubLIB for FOLIO consortium), the National Library of Sweden, the National Library of Australia (Trove), and consortia such as PALCI, FLO, TRLN, Minitex, Ivy Plus, and CAVAL.

Name

Index Data

Legal name

Index Data ApS

Website

https://indexdata.com

Company type

Private

Founded year

1994

Operating status

Operating

Headcount range

11–50 employees

Short description

Index Data is a Danish-founded, privately held software company that develops and hosts open-source library technology platforms — including FOLIO, ReShare, VuFind, and LDP — for academic, public, and special-collection libraries and consortia worldwide, monetized through AWS-hosted SaaS, implementation services, and consulting.

Ownership category

akta.pro rank

Product category

Open Source Library Services Platform (LSP) Software

NAICS

Web Search Portals, Libraries, Archives, and Other Information Services (5192), Custom Computer Programming Services (541511), Computing Infrastructure Providers, Data Processing, Web Hosting, and Related Services (51821), Software Publishers (5132)

SIC

Services-Computer Programming Services (7371), Services-Computer Processing & Data Preparation (7374)

akta.pro primary industry

Data Platform (Unified Data & Analytics) Suites (HDAEABAD)

Keywords

• Open source library software
• Library services platform
• Resource sharing platform
• Library discovery interface
• Library data analytics

Headquarters

HQ city

Boston

HQ country

United States

HQ region

North America

Offices2 records

Markets served

GTM type

B2B

Offering type

Software

Cost components

Personnel, Technology or R&D, Infrastructure, Marketing or Sales, Operations

Revenue model

1. FOLIO SaaS Hosting: Fully managed FOLIO hosting on AWS infrastructure with 99.95% uptime guarantee, 24/7 monitoring, technical support, and regular updates. Revenue generated through recurring subscription fees bundled with VuFind and LDP/Metadb.
2. Implementation Services: Expert migration and setup services including data migration from existing ILS, workflow analysis and optimization, and staff training and change management. One-time professional services engagement for initial implementation.
3. ReShare Hosting and Implementation: Implementation, migration, and ongoing hosting services for ReShare resource sharing platform, including VuFind integration for enhanced discovery.
4. MasterKey Products: Enterprise search platform with modular components for information discovery, including MasterKey Enterprise, MasterKey Share, MasterKey Express, and MasterKey Connect for accessing diverse resources.
5. Software Development: Custom development services for new FOLIO modules, custom integrations with campus systems, and enhanced functionality for unique workflows. All code contributed back to FOLIO community.
6. LDP/Metadb Services: Consulting for analytics strategy, implementation services for getting LDP/Metadb instances running (hosted or self-hosted), and hosting services in secure cloud environment.
7. Consulting Services: Strategic and tactical guidance for FOLIO including technical advice, hands-on implementation, product ownership oversight, team augmentation, and strategic planning.

Pricing tiers

Go-to-market motion2 records

Distribution channels6 records

Marketing channels9 records

Core offering

Index Data develops, hosts, and supports open source library technology platforms for libraries and consortia worldwide. Its core product FOLIO is a modern, modular library services platform for cataloging, circulation, acquisitions, and e-resources management, bundled with the VuFind discovery interface and LDP/Metadb analytics as FOLIO Complete SaaS on AWS. The company also offers ReShare for resource sharing, CYCLOPS for coordinated collections, the MasterKey suite for federated information discovery, and a broad ecosystem of open source tooling (Pazpar2, Metaproxy, YAZ), delivered with implementation, migration, consulting, and custom development services.

Product overview

Index Data is the original architect and developer of the FOLIO open-source library services platform, and offers a portfolio of open-source library technology products and services. The core offering is FOLIO (a modular LSP for cataloging, circulation, acquisitions, and e-resources management), bundled with VuFind (discovery interface), and LDP/Metadb (analytics platform). ReShare provides resource sharing for consortia, and CYCLOPS is a new collaborative collections coordination platform. The MasterKey suite (Enterprise, Share, Express, Connect) provides information discovery and connectivity solutions for accessing heterogeneous data sources. Index Data also maintains a broad ecosystem of open-source tools including Pazpar2 (metasearching middleware), Metaproxy (universal search switchboard), YAZ (Z39.50 toolkit), Zebra (search engine), and multiple language bindings (Perl, Java, PHP, C++) for Z39.50/SRU protocols. All products are open source, with services including hosting, implementation, consulting, and custom development.

Differentiator

Problem solved

Functional benefit

Brands

• FOLIO: Open source library services platform. Index Data is the original architect and developer, offering hosting, development, and consulting services for libraries worldwide.
• ReShare
• LDP (Library Data Platform)
• VuFind
• CYCLOPS
• MasterKey Enterprise
• MasterKey Share
• MasterKey Express
• MasterKey Connect

Products and services

• ReShare Open source resource sharing platform built on ISO 18626 standards, supporting discovery, fulfillment, and delivery workflows (including ReShare Digital for eBook lending and controlled digital lending). Index Data is the only certified ReShare service provider, offering hosting, implementation, migration, and support for library consortia worldwide.
• VuFind Open source discovery web interface for library resource portals, licensed under GPL v2.0, providing Google-like search with relevance-ranked results powered by Apache Solr indexing engine. Offered bundled with FOLIO and ReShare, or as standalone hosting for libraries on other ILS platforms.
• LDP (Library Data Platform) powered by Metadb First scalable, community-owned analytics platform for libraries, designed specifically to be open source and free of vendor lock-in. Metadb integrates data from multiple library systems, supports cross-domain SQL analytics, provides real-time updates from FOLIO and ReShare, and offers historical data storage for trend analysis.
• CYCLOPS (Collaborative Collections Platform) Community-led, vendor-neutral, open source platform built under the IMLS-funded Collaborative Collections Lifecycle Project (CCLP). Helps libraries make informed and coordinated collection-lifecycle decisions across institutions through three layers: Intent Layer, Visibility Layer, and Coordination Layer.
• MasterKey Enterprise Modular enterprise search platform for building powerful discovery products and services that tap into a broad range of information sources, from standard-based and open-source targets to systems and databases without standard APIs or protocols.
• MasterKey Share Cloud-based resource sharing solution enabling resource discovery across multiple library catalogs, delivering comprehensive and accurate search results from multiple vendor systems with ILL integration.
• MasterKey Express for Libraries Affordable cloud-based solution leveraging open access content for libraries, supporting over one thousand open access resources. Enables patrons to search across resources from a single search box with unified, relevance-ranked, de-duplicated results.
• MasterKey Connect Service-based super-API providing access to thousands of resources through one XML-based API with a single query format and unified result record format. Enables access to diverse online databases via native APIs, OAI-PMH harvesting, or screenscraping.
• Pazpar2 High-performance, user interface-independent, data model-independent metasearching middleware web service featuring record merging, relevance ranking, record sorting, and faceted results. Powers hosted MasterKey metasearch solutions.
• Metaproxy Universal search switchboard providing a single Z39.50/SRW/SRU front end to multiple back-end database servers, with caching, load balancing, filtering, and cross-database result set merging. Used for integrating multiple databases within or across organizations.
• FOLIO mod-settings New FOLIO module that replaces the existing mod-configuration module, providing a secure way to store and access configuration information for FOLIO applications.

Quantifiable outcome

• 99.95% uptime guarantee for FOLIO Complete SaaS
• +3 more outcomes

Named customers19 records

Segments7 records

Ideal customer profiles4 records

Technology focussed Yes

API detail

Has API

Yes

API docs

API detail

Core technology

AI maturity

App detail

Feature10 records

Partnerships

Nine partnerships are on record, tiered core and minor.

• Spokane Public LibrarycoreStrategic or Co-development Partner · 14 July 2026Co-founded PubLIB for FOLIO, a development consortium dedicated to public library priorities within the FOLIO platform. Spokane Public Library was the first public library in the US to implement FOLIO in 2021 and now invests in shaping FOLIO's roadmap through this consortium. Consortium membership open to public libraries ready to commit resources and engage in governance.
• Share-VDE / Share FamilycoreStrategic or Co-development PartnerCollaboration with CULT and Casalini Libri to build integrations between the Share-VDE platform and FOLIO. Integration offers FOLIO libraries a model for collaborative bibliographic description based on BIBFRAME-based entities rather than local MARC.
• FOLIO ProjectcoreStrategic or Co-development PartnerOriginal architects and developers of FOLIO, the open source library services platform. Active participation in governance and development decisions as founding members. FOLIO is a collaborative project initiated by a global community of libraries, developers, and vendors.
• Project ReSharecoreStrategic or Co-development PartnerFounding community members since project's inception in 2018. Technology stewards maintaining and evolving the resource sharing platform. Deep community integration in governance and development decisions. Only certified service provider for ReShare hosting and implementation.
• VuFind ProjectcoreStrategic or Co-development PartnerRecognized as a VuFind service provider. Contributes development efforts back to the VuFind community. Offers VuFind hosting services and implementation support.
• National Information Standards Organization (NISO)minorStrategic or Co-development PartnerVoting NISO member contributing to development and maintenance of key metadata standards for nearly two decades. Participates in NISO initiatives including Collaborative Collections Lifecycle Project (CCLP).
• Massachusetts Technology Leadership Council (MTLC)minorStrategic or Co-development PartnerMember of MTLC, a dynamic organization at the forefront of technology and innovation in New England, fostering collaboration and driving technological advancements.
• ISO 18626 Standard CommunitycoreTechnology or IntegrationReShare platform adheres to ISO 18626 messaging standard for interlibrary loan, ensuring true interoperability. Index Data participates in standards enhancement proposals for network-to-network communication.
• Collaborative Collections Lifecycle Project (CCLP)coreStrategic or Co-development PartnerCYCLOPS platform built under IMLS-funded CCLP guidance. Community-led, vendor-neutral initiative for coordinated collection-lifecycle decisions across institutions.

Scale indicators8 records

Recent moves6 records

Expansion highlights6 records

Direct peers

• Atlas Systems: Atlas Systems provides Atlas ILL, a resource sharing platform that competes directly with ReShare in the interlibrary loan space. It serves similar academic and consortium customers and is a key competitor in the resource sharing market.
• ByWater Solutions: ByWater Solutions is the most direct peer, providing open source library services including FOLIO and Koha hosting, implementation, and support. Like Index Data, it serves academic and public libraries globally with community-driven open source technology and competing for the same migration market.
• Relais International: Relais International provides document delivery and resource sharing solutions competing with ReShare. It serves academic libraries and consortia globally, including migration customers from legacy systems like VDX, similar to ReShare's replacement use case.

Broad incumbents

• OCLC: OCLC is the world's largest library cooperative, operating WorldCat, WorldShare Management Services, and resource sharing products. It competes with both FOLIO and ReShare in the ILS and resource sharing categories, and is a major customer and incumbent in the same library market.
• EBSCO Information Services: EBSCO is a major library content and services provider offering FOLIO hosting and support alongside its own discovery services. Notably, it competes with Index Data to host FOLIO customers and recently lost Middle Tennessee State University to Index Data, making it a direct as well as partner-style competitor.
• Ex Libris (Clarivate): Ex Libris is the dominant proprietary library services platform vendor with Alma, Primo, and other products. It is the primary incumbent that the FOLIO open source movement is positioned against, and competes with Index Data for large academic and research library contracts.
• SirsiDynix: SirsiDynix is a long-established vendor of library management systems (Symphony, BLUEcloud) serving thousands of libraries. It competes with FOLIO in the academic and public library markets and represents the type of incumbent that open source platforms are disrupting.
• The Library Corporation (TLC): TLC offers Library.Solution and other library management products, and now owns Innovative. It competes with FOLIO in the school and public library segments and is part of the consolidating vendor landscape that Index Data's open source model is positioned against.
• Innovative (part of The Library Corporation): Innovative provides proprietary library management systems including Sierra and Polaris, serving academic and public libraries. It competes directly with FOLIO for LSP contracts and is part of the broader consolidation trend driving libraries toward open source alternatives.

Emerging players

• Open Library Environment (Project ReShare Community): Project ReShare is the open source community foundation that owns the ReShare platform. Although Index Data is the only certified service provider, the community governance structure means other vendors could emerge as service providers over time, creating potential disintermediation risk.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat6 records

Key risks7 records

Key highlights7 records

Customer concentration

• Xx.com/indexdata
• GitHubgithub.com/indexdata
• YouTubeyoutube.com/channel/UCX1SBaf08xyN4dqUxR0QmHQ
• LinkedInlinkedin.com/company/index-data

Compliance2 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles6 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Index Data