Self-Hosted Web Archiving and Visual Change Detection

Know exactly when — and how — the web changes. Webcap watches the URLs you care about, captures pixel-perfect snapshots on a schedule, and surfaces precisely what's different between any two points in time. All on your own hardware.

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What It Does

Pixel-perfect snapshots: Full-page screenshots paired with complete HTML source, captured on the schedule you set — from once a minute to once a month.

Visual diffs you can trust: Red-overlay change highlighting backed by SSIM similarity scoring, so "looks different" becomes a measurable score and a region map.

Line-by-line HTML comparison: Syntax-highlighted source diffs surface markup, copy, and structural changes the eye misses.

A clean operator interface: Tabbed navigation flips between screenshots, visual overlays, and HTML diffs without losing your place.

Yours, on your hardware: Self-hosted from end to end. No third-party services, no data leaving your network, no recurring SaaS fees.

Flexible schedules: Configure capture intervals per URL, with individual on/off toggles for everything you monitor.

Resilient by default: Background workers with automatic retries and visible error states keep monitoring running unattended.

Powered by Discode

Webcap ships through Discode, the platform for self-hosted Rails applications. One-time purchase, no subscription, full source — and updates land with a single CLI command.

Discode handles installation, updates, and license verification, while your Webcap install stays self-contained and entirely under your control.

Frequently Asked Questions

How do updates work?

The discode CLI tool handles updates. When you want to update your Webcap installation, simply run the following command:

discode update webcap

Do you offer customer support?

Yes. I provide email support at support@rubyup.dev for installation, configuration, and troubleshooting questions.

Can I white label or resell Webcap?

No. Webcap is licensed for your own use only — rebranding and resale aren't permitted.