I got tired of finding out my clients broke their site before I did — so I built Deltio
After years of managing client sites, I started keeping a mental list of things that should never happen but always do.
A client removes 30 pages from the sitemap because "they didn't look important." A developer pushes an update on Friday afternoon without telling anyone. A marketing intern edits the page titles because the old ones "didn't sound good." An agency touches the CMS at 11pm and the Meta Pixel disappears quietly.
Every single time, I found out too late. Either the client called me, or I noticed it myself weeks later when the traffic report looked wrong. Never in real time. Never before Google did.
I tried setting up scripts, Google Search Console alerts, manual checks on a spreadsheet. Nothing was fast enough or complete enough. I needed something that watched the site 24/7 and told me immediately — on Slack, where I actually work.
So I built Deltio.
It monitors sitemap changes (URLs added or removed), SEO metadata (titles, meta descriptions, H1s, canonicals), uptime, SSL expiry, domain expiry, robots.txt, and marketing tags like GA4, GTM, and Meta Pixel. When something changes, you get a Slack or email alert immediately — with a diff showing exactly what changed.
The feature I'm most proud of is the cascade scan: when the sitemap changes, Deltio automatically scans the new or modified URLs for SEO issues. Zero manual action required.
I'm in the early stages — just launched, first users coming in, running my first outreach campaigns. The product is live and working. Now comes the hard part: finding the people who need it.
If you manage client sites and you've lived through any of these situations, I'd love to hear from you. And if you want to try it, there's a 14-day free trial at deltio.io — no credit card needed.
Happy to answer any questions about the build or the stack.
Manu
The cascade scan feels like the strongest wedge because it connects detection to impact. I’d make alert severity explicit so agencies don’t become numb to notifications: a removed pixel or robots noindex is critical, while a title edit may only be informational. Agencies managing 20–100 client sites also seem like a sharper first segment than individual owners because the pain repeats and Slack is already part of their workflow. Client-facing incident reports might turn monitoring into visible retention value too.
Severity tiering is the real gap, right now it's binary on/off per event, no critical vs informational split. You're right that without it, agencies running 20+ sites mute the Slack channel within a week. Noted.
Agencies as the sharper first segment matches what I'm seeing , the pain compounds with site count, and Slack already fits how they work day to day.
Incident reports is a new angle for me. There's a public status page per site today, but that's uptime-only. A monthly "here's what I caught for you" client artifact is a different thing and possibly a retention lever on its own.
Appreciate the depth here, exactly the kind of feedback I was hoping for.