Sidemark

What it does

Sidemark lets you read and leave comments on any website — news articles, YouTube videos, product pages, blog posts, and more. Comments are shared across all users, so when you visit a URL, you see what others have written — and they'll see yours. Share your thoughts on a specific Netflix scene, leave notes on a blog post, or collaborate on a project. It turns the entire web into an interactive comment section.

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  Sidenote2024 · ▲268

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  MarkUp for Chrome2020 · ▲389

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  DoneNote2023 · ▲253

  Leave notes straight on the web page with your entire team

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  VideoMark2022 · ▲94

  Take notes on online videos

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  Bookmark It2018 · ▲152

  Create awesome notes on YouTube videos

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  Page Notes Sidebar2025 · ▲107

  Capture thoughts where they happen

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• H6
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• PU
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  Goldfish▲962

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• IM
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  Life & fun · Jun 2026 · hackernewstrends.com