Last reviewed: March 2026
MonkLayer is built and maintained by MonkLayer, a software engineer who works on browser extensions, real-time collaboration, and Postgres. This page exists so you know who is behind the comparisons, alternatives, and use-case guides on this site, and how the editorial work is done.
I'm a software engineer focused on browser extensions, real-time collaboration, and Postgres. I read and write Preact, TypeScript, Hono, and SQL daily. MonkLayer started as a tool I wanted for design review and visual feedback on live pages and turned into the public free + anonymous version you're looking at now.
The full source is on GitHub. Anyone can read it, file issues, or self-host their own instance. Reach me at hello@monklayer.app or via GitHub Issues.
MonkLayer's stack is public. The Chrome extension is built with WXT and Preact + Preact Signals. The backend is a single Bun application server (Hono framework) holding realtime rooms in memory, with Postgres for annotation persistence and object storage for uploads and preview images. The choice of stack is itself an editorial position: boring, open-source software that one person can operate is what makes a small tool sustainable without a funding round behind it.
Comparison and alternatives pages on this site are written from hands-on use, public documentation, and competitor pricing pages at the time of last review. When MonkLayer is genuinely the wrong fit for a workflow, the relevant page says so and points to a better tool. Every comparison page has a date stamp at the top showing when its pricing and feature claims were last checked.
I don't accept payment, sponsorship, or affiliate fees from any tool listed in a comparison or alternatives page. There are no affiliate links on this site.
If anything stated about another product is wrong, outdated, or unfair, I want to fix it. The fastest path is opening a GitHub issue at github.com/monklayer/MonkLayer/issues with the URL and the specific claim that needs updating. Corrections typically ship within a few days. If a competitor has changed pricing or shipped a feature that closes a gap I called out, that's the kind of update I want to see and apply.
GitHub Issues for product feedback or comparison-page corrections. Email at hello@monklayer.app for everything else.