Bookends

Input—per 1M tokens

Output—per 1M tokens

Context—tokens

WeightsClosed

About

Bookends is ranked #6 of 27 in reference management software on Inferse. It runs on Browser extension, iOS, macOS. A free trial is offered. Paid plans start at $1.25/mo.

Compared on reference management software

Free plan: Yessonnysoftware.com
PDF annotation: Yessonnysoftware.com
Browser extension: Nosonnysoftware.com
Word processor support: microsoft_wordsonnysoftware.com
Mobile apps: iossonnysoftware.com
Import formats: EndNote XML, RIS, BibTeX, PubMed, SenteXMLsonnysoftware.com
Team collaboration: Yessonnysoftware.com

Facts

Purpose: Bookends is a reference management app for students and professionals to collect, organize, annotate, cite, sync, share, and publish research.sonnysoftware.com · 3 Oct 2026
Research discovery: The Mac app includes hundreds of built-in searches and can import references and PDFs from scholarly sources and institutional libraries.sonnysoftware.com · 3 Oct 2026
PDF tools: Its PDF reader supports annotations, notes, deep links, and searching reference records together with attached PDF contents.sonnysoftware.com · 3 Oct 2026
Writing and citations: Bookends can scan manuscripts to replace temporary citations and produce in-text citations, footnotes, and bibliographies using built-in or CSL styles.sonnysoftware.com · 3 Oct 2026
Integrations: The maker lists imports from EndNote, Papers, Sente, Zotero, and Mendeley; integrations with Microsoft Word, Mellel, Nisus Writer Pro, Tinderbox, DEVONthink, and Scrivener; and AppleScript support.sonnysoftware.com · 3 Oct 2026
Browser extension: Bookends Bridge connects third-party browsers to the Mac app for reference collection.sonnysoftware.com · 3 Oct 2026
AI integration: The Mac app works with MCP-capable AI assistants that can search references, read PDFs, add highlights and notes, find citations, and create bibliographies.sonnysoftware.com · 3 Oct 2026
Sync and collaboration: The maker says Mac and iOS libraries sync through iCloud and users can share libraries with Bookends-using colleagues.sonnysoftware.com · 3 Oct 2026
Free demo limit: The Mac demo does not expire but is limited to 50 references, and the current release requires macOS 11 Big Sur or later.sonnysoftware.com · 3 Oct 2026
iOS free limits: Without the Standard purchase, iOS searches return at most 20 references and the local database can store at most 50 references.sonnysoftware.com · 3 Oct 2026
Privacy: For Mac purchases, Sonny Software may receive name, postal address, and email, but says it never receives or stores personal financial information such as card numbers.sonnysoftware.com · 3 Oct 2026
iOS data storage: The privacy policy says iOS reference metadata and optional attachments are stored on users’ devices and Apple iCloud Drive when cloud sync is used, and no data are stored on Sonny Software servers.sonnysoftware.com · 3 Oct 2026
Support: The maker offers a technical support request form and directs users to its FAQ, email, and user forum for help or questions.sonnysoftware.com · 3 Oct 2026
Intended users: The maker describes Bookends for iOS as a reference management app for iPad and iPhone, with scholarly search, PDF annotation, and citation features.sonnysoftware.com · 3 Oct 2026