Grevlo

Grevlo is a headless REST API for UK web agencies managing maintenance retainers. Send a client URL, get back a fully branded white-label PDF report covering uptime, PageSpeed and SSL — automatically, every month. THE PROBLEM IT SOLVES Web agencies managing maintenance retainers spend 3 to 4 hours per client every month manually pulling uptime logs, running PageSpeed audits, and checking SSL certificates. The tools that exist — AgencyAnalytics, DashThis, Swydo — were built for marketing agencies tracking ad spend and keyword rankings. None of them natively monitor whether a client site was actually available last month. None of them run a live Lighthouse audit. None of them track SSL expiry. So maintenance agencies are either paying per-client fees for dashboards their clients never log into, or spending Sunday afternoons copying numbers into a Word document. Grevlo was built for the maintainer, not the marketer. HOW IT WORKS One API call generates a complete, branded PDF report: 1. Set up your agency branding once — logo, colours, contact details 2. POST your client's URL to the Grevlo API at the end of each month 3. Receive a fully branded PDF covering uptime, PageSpeed and SSL The report includes: - 30-day uptime log with availability percentage, pulled from real monitoring data - Mobile and desktop PageSpeed scores from a live Google Lighthouse audit, with Core Web Vitals (LCP, CLS, TBT) - Specific Lighthouse fix recommendations — the exact files causing performance issues and estimated savings in milliseconds - SSL certificate validity, expiry date and days remaining - Agency notes field — add context about work done this month - Your agency logo, colours and contact details on every page — clients see your brand, not Grevlo's WHAT MAKES IT DIFFERENT No dashboard to log into. No manual task checklist. No per-client fees. No data sources to configure. Standard uptime tools check whether your server responds — not whether the page actually works. Grevlo runs a live Lighthouse audit that renders the page and measures what real users experience. A site can return 100% uptime from a ping monitor while the homepage is a blank white screen. As of March 2026, SSL certificates can no longer exceed 200 days — down from 398 days. By 2027 the limit drops to 100 days, and by 2029 it reaches 47 days. Grevlo shows SSL expiry and days remaining on every report so you know before your client does. PRICING Flat rate — no scaling penalty as you add clients: Starter: $62/month (£49) — up to 15 client domains Standard: $125/month (£99) — unlimited domains No per-client fees. No per-data-source charges. No surprise bills as you grow. Free demo at grevlo.com — no signup required. Enter your agency name and a client URL and a real branded PDF generates in about 45 seconds. FOUNDING PARTNER PROGRAMME Currently accepting 5 founding partner agencies: - 3 months free access - Permanent rate lock at your chosen tier - Concierge onboarding — we set up your branding and write your first integration script - Direct input into the product roadmap Apply at grevlo.com. TECHNICAL DETAILS Built on .NET 10, C#, deployed on Railway. Full REST API with Swagger documentation at api.grevlo.com/docs. Authentication via API keys. Supports JSON request body for branding, client name, URL and notes. Returns PDF binary or base64 encoded response. Works with any website regardless of CMS — WordPress, Webflow, Shopify, custom builds, static sites. If it has a URL, Grevlo can report on it.