I donโ€™t know about open source but Google ML Kit supports image labeling for 400+ categories. https://developers.google.com/ml-kit/vision/image-labeling

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Actually, iOS supports the same functionality out of the box. https://developer.apple.com/documentation/vision/classifying_images_with_vision_and_core_ml

Fysa thread, this is how the interface appears in Bluesky.

They use the wordage Alternative Text/Alt Text + have an indicator top right to edit.

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