Looking for a Hypothesis alternative? Hypothesis is already free and open source, so the question is usually: which tool fits my use case better. Text-based scholarly annotation (Hypothesis) or visual annotation with drawings, arrows, and pinned comments (MarkLayer)?
MarkLayer is the right Hypothesis alternative if you need visual annotation. Drawings, arrows, comments pinned anywhere on the page. Diigo is a freemium hybrid. Markup.io and Pastel are paid visual-feedback alternatives. Hypothesis itself remains the right tool for scholarly text annotation.
| Option | Price | Best for |
|---|---|---|
| MarkLayer | Free. No tiers, no seats | Visual feedback on UI, design, and live web product. Not scholarly text. |
| Diigo | Not tracked | Personal research and bookmarking with light annotation. |
| Markup.io | No free plan. Pro $79/month (unlimited users, 1 workspace); 14-day trial | Agency project review on live websites. |
| AnnotateWeb | Free, no tiers | Quick one-off annotations in your native language with no extension. |
Free and open source, no install: paste a URL and annotate in your browser. Drawings, arrows, threaded comments pinned anywhere on the page. Real-time live cursors.
Freemium browser bookmarking and annotation tool with text highlights and sticky notes. Closer to Hypothesis in shape.
Project-based visual feedback platform. Free tier with limits.
Free bookmarklet-based annotation tool with multi-language support.
Paste any URL at marklayer.app and annotate the live page in your browser. No install, no account, no sign-up. Recipients of your share links don't need to install anything either.
Annotate a page