Free tools for people who watch the web
Little utilities we built on top of the Monity engine — travel through a website's history, compare images, capture full pages. Use them, share them, embed them.
Before & After Image Slider
Compare two photos with a liquid WebGL slider, lens, and change heatmap — then embed it on your own site free.
Open the toolFull Page Screenshot
Get a pixel-perfect PNG of an entire web page — rendered in a real browser, no extension needed.
Open the toolText Diff Checker
Compare two texts line by line with word-level highlights, live as you type — plus .patch and HTML export.
Open the toolPDF Diff Checker
Professional PDF comparison — word-level diff, visual overlay, changed values with deltas, CSV export. Files never leave your browser.
Open the toolSEO & AI Visibility Audit
A deep, live audit of any page — SEO, AI visibility, accessibility, HTML, security, Core Web Vitals, plus a multi-page crawl.
Open the toolSocial Share Preview
Preview how any link unfurls on X, Facebook, LinkedIn, Slack, Discord and iMessage — and get told exactly which OG tags to fix.
Open the toolWhy are these free?
Monity's job is watching web pages: rendering them in real browsers, screenshotting them, and spotting what changed. These tools are small pieces of that engine, opened up for anyone to use — no account, no watermarks, no catch. If one of them saves your day, you'll know where to look when you need a page watched around the clock.
Like the tools?
Meet the product.
Monity watches any web page 24/7 and alerts you in Slack, Teams, or email the moment something changes — describe what to watch in plain English.
- Free 7-day trial
- No credit card
- 3 monitors free, forever