Remark42 — Privacy-Focused Self-Hosted Comment Engine

Introduction

Remark42 is a self-hosted commenting server designed as a privacy-respecting alternative to Disqus and similar third-party services. It stores all comments in a local BoltDB database, requires no external dependencies, and gives site owners complete control over their comment data without tracking visitors.

What Remark42 Does

• Embeds a comment widget on any static or dynamic website via a JavaScript snippet
• Supports multiple authentication providers (Google, GitHub, Facebook, email, anonymous)
• Provides comment moderation tools including spam detection and admin panels
• Allows readers to vote, pin, and reply to comments in threaded conversations
• Exports and imports comments from Disqus, WordPress, and Commento formats

Architecture Overview

Remark42 is a single Go binary with an embedded BoltDB storage engine. The server exposes a REST API consumed by a lightweight JavaScript frontend that site owners embed as a script tag. Authentication is handled through OAuth2 providers or a built-in email-based flow. An optional Telegram bot integration enables admin notifications.

Self-Hosting & Configuration

• Deploy via Docker with a single container and a mounted volume for data persistence
• Set the REMARK_URL environment variable to match your site's public URL
• Configure OAuth2 credentials for each authentication provider you want to enable
• Add a small JavaScript snippet to your website pages where comments should appear
• Enable Telegram notifications by setting the bot token and chat ID variables

Key Features

• Zero external tracking or analytics on commenters
• Embedded BoltDB requires no separate database server
• Multi-site support from a single Remark42 instance
• Built-in image proxy to prevent mixed-content warnings
• Automatic comment backups with configurable retention

Comparison with Similar Tools

• Disqus — hosted third-party with ads and tracking; Remark42 is fully self-hosted and private
• Isso — similar self-hosted approach but Python-based; Remark42 uses Go with BoltDB
• Commento — privacy-focused but requires PostgreSQL; Remark42 needs no external database
• Giscus — uses GitHub Discussions; Remark42 stores data independently

FAQ

Q: Can I migrate from Disqus? A: Yes. Remark42 includes a built-in import tool that reads Disqus XML export files.

Q: Does it support Markdown in comments? A: Yes. Commenters can use Markdown formatting with live preview.

Q: How does moderation work? A: Admins can delete, pin, and block users from the admin panel or via the Telegram bot.

Q: What happens if I lose the database? A: Remark42 supports automatic scheduled backups. Enable them to prevent data loss.

Sources

• https://github.com/umputun/remark42
• https://remark42.com