Bottom line: Tweak is the strongest structured replacement for Markup.io if you need visual feedback on live pages with developer workflows. PageProofer, BugHerd, and Pastel add agency workflow features. Hypothesis is free but text-only.
By Vetagiri Hrushikesh · Last updated: April 2026
Looking for a free Markup.io alternative? Below are the strongest options as of 2026, ranked by how cleanly they replace the core Markup.io workflow: visual feedback on live websites with link-based sharing.
Commercial Chrome extension and on-site embed for structured website review. GitHub sign-in for developers; share links for clients. Free + Pro plans at tweak.page/upgrade.
Best for: Anyone who wants the core Markup.io use case (live webpage feedback) without sign-up or fees.
Visual feedback on staging sites with sticky-note style comments. Has a free trial; paid plans for teams.
Best for: Teams already comfortable with a paid SaaS workflow.
Visual bug tracker with a Kanban board and integrations into Jira, GitHub, Trello, and Asana. Paid only.
Best for: Teams that need full bug-tracking workflow, not just feedback.
Markup.io's sister product. Project-based visual reviews with agency workflow features. Paid with free trial.
Best for: Agencies running structured client review cycles.
Free, open-source text annotation layer. Best for academic and research-style annotation, not visual feedback.
Best for: Scholarly or text-heavy annotation, not UI feedback.
Tweak is a commercial website review platform with Free and Pro plans. Developers sign in with GitHub; clients open share links without installing anything.
Chrome extension: by invitation — request an invite