Hypothesis vs Revisely

Hypothesis adds shared annotations to digital course materials, letting learners mark passages, ask questions, and reply to peers alongside the content. Users can create private highlights and page notes, add tags, and hold threaded discussions. Supported material includes web pages, PDFs, EPUB files, YouTube videos, and content from VitalSource and JSTOR. For institutional use, Hypothesis lists LTI 1.3 integrations with Canvas, Blackboard, Moodle, D2L Brightspace, and Sakai; annotations can also sync with LMS gradebooks, including Canvas SpeedGrader. A free account is available for personal use and collaboration. The web app works with a Chrome extension on Chrome and other Chromium browsers, or a bookmarklet in Firefox and Safari. Hypothesis also offers API access, exports in JSON, plain text, CSV, and HTML, and JSON import. The Free plan costs nothing, billed per student/yearly, and includes core annotation, private groups, and self-service support. The project was founded as an open-source project in 2011.

Revisely is a Chrome extension for reviewing live websites, adding visual feedback, editing CSS, and preparing implementation handoffs. Users select an element on a page, add feedback or CSS changes, and export a prompt, revision card, or issue-ready text. Auto Issue Finder checks for contrast, tiny text, missing alt text, small touch targets, heading problems, image issues, links, and ARIA gaps. Pro adds handoff profiles for Claude, ChatGPT, Cursor, v0, and Lovable, along with issue-ready exports for GitHub, Linear, and Jira. Feedback sessions stay in Chrome storage on the user's device; the product says it has no cloud workspace. Pro also offers controls for masking sensitive text before export. The Free plan costs nothing and includes annotations, live CSS edits, and general AI prompt export. Lifetime Pro costs $9.99, paid once, with no subscription, and supports up to five devices. The extension works on many public and local pages, including localhost and staging, when Chrome permits extension injection; restricted pages or environments may block it.