Model Hubs & Serving

Annotorious

Image annotation tool for OpenSeadragon comments.

Status
Not yet determined
Last checked
Checked · Oct 4, 2026
License
Open source
Pricing
Free tier
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What it is

Annotorious is an image annotation tool designed to integrate with OpenSeadragon, a web-based viewer for high-resolution images. It allows users to create, edit, and manage annotations on images, which can be particularly useful for applications in research, education, and media. The tool is lightweight with an unpacked size of 573 KB and does not have any dependencies, making it easy to integrate into existing projects. However, it has not been actively maintained since its last release in 2018.

Specifically designed for integration with OpenSeadragon.

When it fits — and when it doesn’t

A good fit for

  • Projects using OpenSeadragon

    Seamless integration with OpenSeadragon enhances image viewing and annotation capabilities.

  • Lightweight web applications

    Its small size and lack of dependencies make it ideal for applications where performance is critical.

Look elsewhere if

  • Projects requiring active maintenance

    The tool has not been updated since 2018, which may be a concern for long-term projects.

  • Applications needing extensive community support

    Low usage and community engagement may limit available support and resources.

Known weaknesses

Each one links to the public issue, changelog or docs page it came from, where we have one.

  1. 01

    Lack of recent updates

    Last published in 2018

  2. 02

    Limited community support

    Low weekly downloads (37)

What it does well

  • Lightweight and easy to integrate

    Unpacked size of 573 KB and zero dependencies

  • OpenSeadragon integration

    Specifically designed to work with OpenSeadragon

Pricing

Free tier
Yes
Paid from
—
Model
Flat rate
Enterprise plan
No

Pricing last confirmed Sep 28, 2026.

Performance benchmarks

How Fast Is It?

Set up Annotorious

Setup steps, common gotchas and what to check after 30 days.

Open the setup guide →
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