Editing Web annotation (section)

===Comparison of web annotation systems===
Many of these systems require software to be installed to enable some or all of the features below. This fact is only noted in footnotes if the software that is required is additional software provided by a third party.
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{| class="wikitable sortable sort-under"
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! Annotation system !! {{verth|Private notes}} !! {{verth|Private group notes}} !! {{verth|Public notes}} !! {{verth|Notification}} !! {{verth|Highlighting}} !! {{verth|Formatted text}} !! Archives
! Viewing annotations !! API
! Open Source 
! {{verth|implements/exports/imports<br/>Web annotation standard}}!! Notes
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| [[A.nnotate]] || {{yes}} || {{yes}} || {{no}} || {{yes}}<ref>See [http://a.nnotate.com/notifications.html A.nnotate notifications]</ref> || {{yes}} || {{no}} || {{yes}}
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| {{yes}}
| {{no}} (proprietary)
| {{Unknown}}|| Can annotate PDF, ODF, .doc, .docx, images, as well as web pages (but only a limited number in the free version)
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|Annotorius<ref>{{Cite web |title=Annotorious {{!}} JavaScript image annotation library |url=https://annotorious.github.io/ |access-date=2023-10-18 |website=annotorious.github.io}}</ref>
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|{{yes}}, via Google Firebase plugin<ref>{{Cite web |title=Getting Started: Storing Annotations |url=https://recogito.github.io/annotorious/getting-started/storing-annotations |access-date=2023-10-18 |website=recogito.github.io}}</ref>
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|{{yes}}
|{{yes}} (BSD)<ref>{{Cite web |title=Annotorious {{!}} About |url=https://annotorious.github.io/about/ |access-date=2023-10-18 |website=annotorious.github.io}}</ref>
|{{yes}}<ref>{{Cite web |title=Annotorious & Web Annotation |url=https://recogito.github.io/annotorious/getting-started/web-annotation |access-date=2023-10-18 |website=recogito.github.io}}</ref>
|JavaScript image annotation library and plugin to [[Seadragon Software|OpenSeadragon]], also supports simple text annotations
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| [[Diigo]] || {{yes}} || {{yes}} || {{yes}} || {{yes}} || {{yes}} || {{no}} || {{yes}}
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| {{yes}}
| {{no}} (proprietary)
| {{Unknown}}|| Public annotations are only allowed for established{{Definition needed|date=March 2016}} users. Group tag dictionary feature to encourage tagging consistently within a group.
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| [[Hypothes.is]] || {{yes}} || {{yes}} || {{yes}} || {{yes}} || {{yes}} || {{yes}} ||
|Chrome, via.hypothes.is
|{{yes}}
| {{yes}} (MIT, BSD)
| {{No}},<ref>{{Cite web |title=Hypothesis API documentation (v1) |url=https://h.readthedocs.io/en/latest/api-reference/v1/ |access-date=2023-10-18 |website=h.readthedocs.io}}</ref> but listed on Web Annotation wiki|| In February 2015, different features were announced,<ref>{{cite web |title=Trello |url=https://hypothes.is/roadmap/ |website=hypothes.is}}</ref> such as private group annotation, semantic tagging, moderation, etc. Web Annotation integration was discussed in 2014.<ref>{{Cite web |last=bigbluehat |date=2014-10-15 |title=Open Annotation RDFa using Hypothes.is JSON |url=https://web.hypothes.is/blog/open-annotation-rdfa-using-hypothes-is-json/ |access-date=2023-10-18 |website=Hypothesis |language=en-US}}</ref><ref>{{Cite web |title=Implementations - Web Annotation Wiki |url=https://www.w3.org/annotation/wiki/Implementations |access-date=2023-10-18 |website=www.w3.org}}</ref>
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| [[Org-mode]] (with extensions) || {{yes}} || {{no}} || {{no}}<ref>Technically, public annotations are possible via the "publish to HTML" feature of org mode -- but no method for notifications or discovery of public annotations written by others is currently known.</ref> || {{No}}<ref>But local annotations can be exposed to a firefox browser using [http://orgmode.org/worg/org-devel.html Fireforg].</ref>|| {{no}} || {{yes}} || {{no}}
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| {{yes}}
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| {{Unknown}}|| Emacs-based; requires technical knowledge to set up; not as user-friendly as some other solutions; non-Latin characters allowed in notes but not in tags
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|Recogito<ref>{{Cite web |title=Semantic Annotation without the pointy brackets |url=https://recogito.pelagios.org/ |access-date=2023-10-18 |website=recogito.pelagios.org}}</ref>
|{{yes}}
|{{yes}}
|{{yes}}
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|{{yes}}
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|{{yes}}
|{{yes}}
|{{yes}} (Apache)
|{{yes}}
|Annotation of named entities, linking with maps and [[Knowledge graph|knowledge graphs]], developed by the Pelagios network,<ref>{{Cite web |title=Welcome to Pelagios Network |url=https://pelagios.org/ |access-date=2023-10-18 |website=pelagios.org}}</ref> popular in [[Digital humanities|Digital Humanities]]
|}