Diigo

Overview

Diigo is a personal knowledge-management service for collecting web material and preserving the notes, highlights and images that explain it. It is best suited to researchers, students, educators and small professional teams whose bookmarks need searchable context and shared libraries. The main trade-off is capacity: serious PDF, archive and collaboration use quickly moves beyond the free tier.

Key features

A cloud library stores links, pages, notes and pictures and supports full-text search. Diigo can archive saved webpages, including searchable copies, so a source remains useful when its original changes or vanishes. Digital highlighters and sticky notes work while browsing on computers, tablets and phones, turning a bookmark into an annotated reference.

Groups create shared repositories in which members browse, search and discuss material through on-page annotations. That is a meaningful advantage for research teams, classrooms and agencies, although the number and size of groups depend on the plan. Social-media bookmarking can save selected items automatically, while Save by Email captures links and notes from an inbox.

Import is available from a browser, Delicious or Pinboard; export covers the library and annotated PDF files. Diigo also exposes an API and services for blog auto-publishing, tagrolls and linkrolls, giving organizations options beyond the standard web interface. A browser extension, Diigo Browser for iOS, Diigo for Android and Quick Note on Mac cover the main capture routes.

Diigo says it does not record browsing history except for pages deliberately bookmarked to its servers, which are in the United States. Accounts use member-created passwords, database protections and restricted employee access, but Diigo does not guarantee account security. It says the service meets most WCAG 2.0 standards.

Pricing

The Free plan costs nothing and allows 1,000 bookmarks or notes, 200 highlights, 50 screenshots or images, five outliners and one private group with three members. It excludes PDF annotation and limits social-media bookmarking. This is adequate for a light personal archive, not a long-running research collection.

Teacher is also free, with unlimited bookmarks and notes, 5,000 highlights, 50 PDF annotations, 1,000 screenshots or images, 20 outliners, one public group with unlimited members and 20 private groups of up to 50 members. It is the strongest no-cost choice for classroom collaboration, provided the teacher plan fits your role.

Standard costs $5 a month, or Only $5/month, $40/year. It removes bookmark and note limits, permits unlimited cached pages and screenshots or images, and raises PDF annotations to 100 and outliners to 40. It includes one unlimited-member public group and three private groups with 10 members each. Choose it for an individual or small team that needs archiving without unlimited collaboration.

Professional costs $6 a month, or Only $6/month, $59/year. It makes bookmarks, highlights, PDF annotations, cached pages, screenshots and images unlimited, and adds unlimited outliners, groups and social-media bookmarking. This is the sensible tier for heavy collectors and organizations whose volume would make Standard quotas restrictive.

Platforms

Diigo runs on the web, Android and iOS, with a browser extension and macOS support. That combination supports capture at a desk and on mobile, while the listed Mac utility is Quick Note.

Who it's for

Law firms, marketing agencies, consultants, recruiters, web designers, researchers, students and teachers are natural fits. Pick Diigo when preserving a page, marking its exact passages and sharing that evidence matter as much as saving the URL. It is less suitable for a minimal bookmark list or anyone unwilling to manage plan quotas and group limits.

Pros and cons

Pros: searchable web archives protect against changed sources; highlights, sticky notes and PDF export preserve research context; shared libraries support annotated collaboration; imports, exports, email capture and API access reduce lock-in.

Cons: the free tier stops at 1,000 bookmarks or notes and 200 highlights, and has no PDF annotation; Standard still caps PDF annotations, outliners and private groups; account security is described with no guarantee.

Alternatives

For a broader directory of options, see Bookmark Managers.

Start.me suits readers who want visual start pages and widgets; its free plan allows three pages and includes advertising, while PRO costs $25 a year.

Raindrop.io is the better fit for unlimited bookmarks, collections, highlights and devices on its free plan, with 100 MB of file uploads per month.

Symbaloo favors ad-supported, education-oriented start pages and Learning Paths.

Karakeep is preferable when self-hosting matters; its free hosted allowance is 10 bookmarks and 20MB storage.

LinkAce is for a self-hosted bookmark archive, with hosting offered separately.

StowLink targets Apple users who want a Mac and iPhone bookmark tool.

Delinqs fits small teams needing unlimited bookmarks on a free plan for up to three users.

floccus is a free, open-source bookmark option with self-hosting support.

Verdict

Choose Diigo if your work depends on searchable archives, passage-level annotation and shared research libraries across web and mobile. Its Professional tier is compelling for unlimited capture and groups; look elsewhere if you need only lightweight bookmarking, self-hosting or a larger free allowance for PDFs and saved items.