Your site says it is up. Guard proves it still works.
Modern websites can look fine to your server while showing blank pages, broken forms, missing content, or hidden pages to real users. Guard scans your important pages every 30 minutes and alerts you the moment something silently breaks.
No credit card required. Set up in under 5 minutes.
Guard Scan
/pricing
HTTP Status
Content
Conversion
Visibility
Your uptime says everything is fine. Real users see a broken page.
Works with any modern hosting platform
What does Guard do?
Guard monitors the pages that drive your business — revenue, signups, search visibility, AI understanding. It detects blank renders, content drops, broken metadata, and failed CTAs before they become real problems.
From monitoring to protection in four simple steps
Monitor
We check your key pages every 30 minutes, rendering them like a real browser to see what users actually see.
Detect
Our 30 signals identify content drops, broken renders, missing CTAs, and SEO issues before they impact users.
Alert
Get instant notifications via Slack, email, or webhooks when something breaks on your critical pages.
Protect
Know about issues within minutes of deploy, not days later from angry users or lost revenue.
Your most important pages stay healthy. If they break, you find out in minutes — not days.
Set up in under 5 minutes. No code changes required.
The visibility gap
Your server says the site is up. But is it actually working?
Modern websites fail in ways that traditional monitoring misses completely. Your uptime dashboard shows green while customers, Google, and AI tools see something completely broken.
Blank Pages
Page loads but shows nothing. The server thinks it worked. Users see white.
Missing Content
Buttons disappear. Pricing vanishes. Forms break. All while the site stays up.
Hidden from Google
Accidental noindex tags, canonical changes, or sitemap errors tank your traffic.
Broken Dependencies
Third-party scripts fail, auth providers error, CDN issues cascade to users.
Ready to protect your key pages?
Start your free 10-day trial. No credit card required.
Where every other tool stops
Guard catches what nothing else does. It's the page-level truth layer your stack can't see.
The layer between “server is up” and “the page actually works.” Most failures that cost you traffic and revenue happen after the server responds OK.
| Failure Mode | Uptime | APM | SEO Crawler | Synthetic | Guard |
|---|---|---|---|---|---|
Server returns OK HTTP-level reachability | |||||
Backend errors / slow API Server-side faults and latency | |||||
Page renders blank after deploy Server OK, but DOM is empty | |||||
JavaScript crash on load React shell renders, app never boots | |||||
Visible text dropped Content quietly disappears from rendered page | |||||
Primary CTA missing Pricing or signup button gone after a release | |||||
noindex tag added accidentally A dev config leaks to production | |||||
Canonical URL changed SEO authority silently re-routed | |||||
Critical bundle failed to load Third-party or CDN script never arrives | |||||
Checkout silently broken Form renders but payment never submits | |||||
Social preview broken OG tags missing or wrong on share | |||||
AI-readable content lost LLM crawlers see an empty shell | |||||
| Catches it- Partial / depends on setup- Blind to it | |||||
Keep your APM. Keep your SEO suite. Guard is the missing layer that proves — page by page, deploy by deploy — that what you shipped is actually what your customers and crawlers see.
The solution
Guard watches what actually matters.
Guard is the safety layer between “ship it” and “why is conversion down?” — for teams that can't afford to learn about broken pages from customers.
Page-level monitoring
Homepage, pricing, signup, checkout, docs — any URL you can't afford to break silently.
Scans every 30 min
Recurring checks, not one-off audits. Fresh proof your pages still work, all day, every day.
Captures the truth
Screenshot, HTML, AI Markdown, Lighthouse, static files — stored on every scan.
Alerts that matter
Pages roll up to worst test. You get context and evidence, not noise.
What Guard runs
32 automated tests. Zero scripts to write.
8 categories of production checks run on every page, every scan — from “is it even reachable” to “did the deploy silently break your content.”
Availability
Is the page even reachable?
Render Integrity
Did the page actually render?
Content Stability
Did the content silently change?
Critical Signals
Are your SEO & AI signals intact?
Performance
Is the page fast enough?
Dependencies
Did a third party break you?
Interaction
Can users actually convert?
Security
Is anything tampering with the page?
Every check explains what broke, why it happened, and exactly how to fix it.
Explore the full test catalogEverything you need to protect your pages.
Beyond the 30 automated tests, Guard gives you powerful tools to understand, track, and improve your site health over time.
Lighthouse Scoring Over Time
Performance, Accessibility, Best Practices, SEO — tracked per page, per scan.
Guard runs Google Lighthouse on every monitored page and stores the scores so you see trends, not just snapshots. When Performance drops from 92 to 58 after a deploy, you find out from us first.
- Four core scores captured on a fixed schedule
- Historical charts with deploy-aligned change markers
- Core Web Vitals: LCP, CLS, TBT, FCP, TTI, Speed Index
- Alert when a score drops below your threshold
Average across 22 pages
Perf
A11y
BP
SEO
All features included in every plan.Start your free 10-day trial
Ready to protect your key pages?
Start your free 10-day trial. No credit card required.
What you get
Not vague red lights. Real evidence.
When something breaks, Guard tells you exactly what changed, when it changed, and why it matters — with the raw scan data attached.
Built for the pages that matter.
Founders
Don't hear about a dead signup flow from a customer. Guard watches your revenue pages every 30 minutes.
Agencies
Turn post-launch protection into a recurring client deliverable. Show proof their pages are still healthy.
Marketing & SEO
Catch noindex, canonical, structured data, rendered-content, and Lighthouse regressions before rankings drop.
Frequently asked.
How is Guard different from uptime monitoring?
Uptime checks prove your server returned a response. Guard renders the page like a real browser and verifies the content, signals, scores, and static files customers and crawlers actually see. A green uptime dashboard doesn't mean your page works.
Does Guard track Lighthouse scores?
Yes. Every monitored page is run through Google Lighthouse on every scan. Guard stores Performance, Accessibility, Best Practices, and SEO scores along with Core Web Vitals so you can spot regressions in days, not quarters.
Does Guard monitor robots.txt, sitemaps, and llms.txt?
Yes — automatically. Add a target like example.com/pricing and Guard tracks the static files on that domain (robots.txt, sitemap.xml, llms.txt, favicons), validating availability, syntax, and blocking issues on every scan.
Do I need to write any tests or scripts?
No. Guard runs 30 automated checks across 6 categories — Render Integrity, Content Stability, Critical Signals, Dependencies, Static Files, and Performance — out of the box. You just add the URLs you want monitored.
Is your page actually working?
Enter any URL and we'll run 30 production-grade checks — render integrity, SEO, AI readability, Core Web Vitals, and more. Results in under 10 seconds.
Production-grade page testing
This tool runs the same 30 checks that DataJelly Guard uses to monitor production pages. Get instant insights into render integrity, SEO signals, dependencies, and performance.
What this audit checks
Want continuous monitoring? Start a free 10-day trial and Guard will watch your pages every 30 minutes — catching issues before your users do.
Start free trialStart protecting your pages today.
Get 10 days free to monitor your most important pages. No credit card required. Set up in under 5 minutes.
Questions? Check our pricing or email support@datajelly.com