Top 5 Proprietary Software Systems Used by International Libraries

Gretchen GardellaNo CommentsBlog, Liblime

While open-source platforms like Koha have made real inroads, proprietary systems still dominate library technology worldwide, particularly among academic, national, and large public library systems. Industry consolidation has concentrated much of this market under a small number of large vendors [1]. Here are the five most widely used proprietary systems in 2026.

1. Ex Libris Alma

Alma, owned by Clarivate, is the leading library services platform for academic and national libraries [1][2]. New 2026 selections include the National Library of Thailand, the University of London, and Ghent University in Belgium [1], while earlier implementations included the British Library, the University of Melbourne, and the Smithsonian Institution [3]. Independent survey data backs its market lead: more libraries using Alma responded to the most recent international library automation survey than for any other product, and it was cited most often by libraries evaluating a system change [4]. American Libraries Magazine, Library Technology Guides

2. OCLC WorldShare Management Services (WMS)

WMS is built on WorldCat, giving subscribing libraries access to a shared global bibliographic network. According to OCLC’s own reporting, 48 new libraries joined the WMS community in the 12 months leading up to June 2026, including Germany’s Heidelberg University Library and its 35 institutes and department libraries [5]. Note: OCLC is a nonprofit library cooperative rather than a commercial vendor, but these figures come from OCLC’s own announcements; I did not find independent third-party verification of the specific count. Library Technology Guides

3. SirsiDynix Symphony

Symphony remains a widely deployed integrated library system across public, academic, and special libraries. In a change independently confirmed by multiple library-technology analysts, SirsiDynix was acquired by Harris Computing, an operating company of Toronto-based Constellation Software, from private equity firm ICV Partners, with the deal closing in December 2024 [6][7]. The most recent international library automation survey found a modest drop in satisfaction associated with this ownership change [4]. Stephen’s Lighthouse, Library Technology Guides

4. Innovative (Sierra / Polaris)

Innovative’s Sierra and Polaris platforms serve public and academic libraries internationally. Innovative was acquired by Ex Libris in 2020, and both became part of Clarivate when it acquired ProQuest in December 2021 — a merger that drew scrutiny from the Federal Trade Commission before closing, according to independent trade coverage [2][8]. Internationally, Polaris has been selected by Shellharbour City Libraries in Australia and by Catalonia’s Department of Education for its network of 2,245 school libraries [2]. Clarivate continues active development, having introduced a May 2026 Sierra release with enhancements to circulation, cataloging, authentication, and reporting [9]. American Libraries Magazine + 2

5. Follett Destiny Library Manager

Destiny is the dominant proprietary system in the K-12 school library market. Independent review platforms corroborate its market position: Capterra reports that more K-12 schools and districts use Follett Destiny than any other platform [10], and the vendor states it serves more than 65,000 customers, though that specific figure is self-reported [11]. Capterra

A Market Still Consolidating

Independent trade press confirms what these five platforms illustrate: a library technology market increasingly shaped by a handful of large players — Clarivate (Alma, Sierra, Polaris), the nonprofit cooperative OCLC, Harris/Constellation Software (SirsiDynix), and Follett — with regulators having already scrutinized some of the underlying mergers [2][8].

Sources

  1. American Libraries Magazine. “2026 Library Systems Briefing.” June 1, 2026. https://americanlibrariesmagazine.org/2026/06/01/2026-library-systems-briefing/
  2. American Libraries Magazine. “2025 Library Systems Report.” August 26, 2025. https://americanlibrariesmagazine.org/2025/05/01/2025-library-systems-report/
  3. Library Technology Guides. “Ex Libris profile.” https://librarytechnology.org/vendor/exlibris/
  4. Breeding, Marshall. “Library Perceptions 2026: Results of the Nineteenth International Survey of Library Automation.” May 21, 2026. https://librarytechnology.org/PerceptionsReport
  5. Library Technology Guides. “WorldShare Management Services Profile.” June 25, 2026. https://librarytechnology.org/product/wms/
  6. Breeding, Marshall. “SirsiDynix Acquired by Harris Computer.” Library Technology Guides, January 7, 2025. https://librarytechnology.org/document/30893
  7. HELibTech. “SirsiDynix Acquired by Harris Computing.” February 12, 2025. https://www.helibtech.com/news/2025-02-12-sirsidynix-acquired-by-harris-computing
  8. American Libraries Magazine. “2022 Library Systems Report.” May 3, 2022. https://americanlibrariesmagazine.org/2022/05/02/2022-library-systems-report/
  9. Library Technology Guides. “Innovative Interfaces, Inc. profile.” https://librarytechnology.org/vendor/innovative/
  10. Capterra. “Follett Destiny Library Manager Software Pricing, Alternatives & More 2026.” https://www.capterra.com/p/8972/Destiny-Library-Manager/
  11. Microsoft Marketplace. “Follett Destiny Library Manager.” https://marketplace.microsoft.com/en-us/product/web-apps/follettunitedstates-4537836.destiny_library_manager