Looking for a Hypothesis alternative? Hypothesis is already free and open source, so the real question isn't price. It's whether your annotations belong to a document or to a page.
Hypothesis is built for reading, not reviewing. Researchers use it for close reading and journal clubs; students and teachers use it to mark up assigned articles and PDFs together; open-access advocates use it because it's one of the few annotation layers built on an actual W3C standard rather than a vendor's proprietary format. Every annotation anchors to a text selection, so it survives page reformatting the way a highlighter mark on a printout never could. That's the whole design: comment on what a passage says, in public or in a private group, and let the thread sit alongside the source forever.
None of that helps if what you're reviewing is a live web page or a working product rather than a passage of prose. Hypothesis has no freehand drawing, no arrows, no way to circle a misaligned button or drop a pin on a spot in a screenshot that isn't inside a sentence. It also has nothing like real-time collaborative cursors: two people annotating the same article in Hypothesis leave separate marks, not a shared live session. That's a deliberate scope decision for a text-annotation tool, and a real gap if the job is design review, QA, or client feedback on a live site.
MarkLayer picks up exactly that gap. Paste a URL, annotate the rendered page with drawings, arrows, and threaded comments pinned to actual elements, and share a link, no account and no install required. It's the visual counterpart to what Hypothesis does for text: free and open source, but built for pages you're reviewing rather than passages you're reading.
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 the live page directly in your browser. Draw arrows, circle a broken layout, and drop threaded comments anywhere on the page, then watch collaborators' cursors move in real time. Built for live web pages and interactive products, not article text.
Freemium browser bookmarking and annotation tool that layers text highlights and sticky notes onto pages you save. Closer to Hypothesis in spirit than to MarkLayer: it's a research and reading tool first, not a visual review tool for a live product. The free tier caps highlights and groups; paid plans add offline access and more storage.
Project-based visual feedback platform from Ceros for reviewing live websites and design files inside a persistent team workspace. It dropped its free plan in 2025, and Pro now starts at $79/month, but it adds version tracking and approval workflows that neither Hypothesis nor MarkLayer offer.
Free bookmarklet-based annotation tool with a multi-language interface and PNG export, no browser extension required. Annotations auto-delete after two minutes of inactivity, so it suits a quick one-off markup more than an ongoing review thread.
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