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About

Annotator is an open source JavaScript library to easily add annotation functionality to any webpage. Annotations can have comments, tags, links, users, and more. Annotator is designed for easy extensibility so it's a cinch to add a new feature or behaviour. Annotator also fosters an active developer community with contributors from four continents, building 3rd party plugins allowing the annotation of PDFs, EPUBs, videos, images, sound, and more. Adding an annotation to any website is easy with Annotator. First, download the Annotator library, and include it in your HTML. Annotator has a simple but powerful plugin architecture. Plug-ins can also be included for adding functionality such as user permissions, tags, filtering, and formatting. More than a dozen projects rely on Annotator for their digital annotation needs and many are open source. Share text and video annotations using social networks or email.

About

OpenPaper is an AI-native workbench designed to help researchers read, annotate, and understand academic papers more effectively. It offers a split-pane interface that allows users to engage with the full text of a paper while interacting with an AI assistant. This assistant provides grounded citations for its responses, ensuring transparency and trustworthiness. Key features include inline annotations, audio overviews of papers, and the ability to find related research using OpenAlex. Users can upload papers to build a personal knowledge base and switch between AI models like GPT-4 and Gemini 2.5 Pro. It also supports shareable annotations, facilitating collaboration among researchers.

Platforms Supported

Windows Supported
Mac Not Supported
Linux Not Supported
Cloud Supported
On-Premises Not Supported
iPhone Supported
iPad Supported
Android Supported
Chromebook Not Supported

Platforms Supported

Windows Not Supported
Mac Not Supported
Linux Not Supported
Cloud Supported
On-Premises Not Supported
iPhone Not Supported
iPad Not Supported
Android Not Supported
Chromebook Not Supported

Audience

Developers wanting a solution to build annotation applications in browsers

Audience

Graduate students and academic researchers needing a tool to read, annotate, and comprehend scholarly articles with AI assistance

Support

Phone Support Not Supported
24/7 Live Support Not Supported
Online Supported

Support

Phone Support Not Supported
24/7 Live Support Not Supported
Online Supported

API

Offers API Not Supported

API

Offers API Not Supported

Screenshots and Videos

Screenshots and Videos

Pricing

Free
Free Version Supported
Free Trial Not Supported

Pricing

Free
Free Version Supported
Free Trial Not Supported

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

This software hasn't been reviewed yet. Be the first to provide a review:

Review this Software

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

This software hasn't been reviewed yet. Be the first to provide a review:

Review this Software

Training

Documentation Supported
Webinars Not Supported
Live Online Not Supported
In Person Not Supported

Training

Documentation Supported
Webinars Not Supported
Live Online Not Supported
In Person Not Supported

Company Information

Annotator
annotatorjs.org

Company Information

Open Paper
United States
openpaper.ai/

Alternatives

Alternatives

Scraiber

Scraiber

Scraiber GmbH
Sumnotes

Sumnotes

Fifth Force

Categories

Categories

Academic Research Supported
AI Tools Supported

Integrations

GPT-4 Not Supported
Gemini 2.5 Flash Not Supported
HTML Supported
JavaScript Supported

Integrations

GPT-4 Supported
Gemini 2.5 Flash Supported
HTML Not Supported
JavaScript Not Supported
Claim Annotator and update features and information
Claim Annotator and update features and information
Claim Open Paper and update features and information
Claim Open Paper and update features and information